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Pourrahimi, Amir MasoudORCID iD iconorcid.org/0000-0001-5867-0531
Alternative names
Publications (10 of 17) Show all publications
Karlsson, M. E., Mamie, Y. C., Calamida, A., Gardner, J. M., Ström, V., Pourrahimi, A. M. & Olsson, R. (2018). Synthesis of Zinc Oxide Nanorods via the Formation of Sea Urchin Structures and Their Photoluminescence after Heat Treatment. Langmuir, 34(17), 5079-5087
Open this publication in new window or tab >>Synthesis of Zinc Oxide Nanorods via the Formation of Sea Urchin Structures and Their Photoluminescence after Heat Treatment
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2018 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 34, no 17, p. 5079-5087Article in journal (Refereed) Published
Abstract [en]

A protocol for the aqueous synthesis of ca. 1-mu m-long zinc oxide (ZnO) nanorods and their growth at intermediate reaction progression is presented, together with photoluminescence (PL) characteristics after heat treatment at temperatures of up to 1000 degrees C. The existence of solitary rods after the complete reaction (60 min) was traced back to the development of sea urchin structures during the first 5 s of the precipitation. The rods primarily formed in later stages during the reaction due to fracture, which was supported by the frequently observed broken rod ends with sharp edges in the final material, in addition to tapered uniform rod ends consistent with their natural growth direction. The more dominant rod growth in the c direction (extending the length of the rods), together with the appearance of faceted surfaces on the sides of the rods, occurred at longer reaction times (>5 min) and generated zinc-terminated particles that were more resistant to alkaline dissolution. A heat treatment for 1 h at 600 or 800 degrees C resulted in a smoothing of the rod surfaces, and PL measurements displayed a decreased defect emission at ca. 600 nm, which was related to the disappearance of lattice imperfections formed during the synthesis. A heat treatment at 1000 degrees C resulted in significant crystal growth reflected as an increase in luminescence at shorter wavelengths (ca. 510 nm). Electron microscopy revealed that the faceted rod structure was lost for ZnO rods exposed to temperatures above 600 degrees C, whereas even higher temperatures resulted in particle sintering and/or mass redistribution along the initially long and slender ZnO rods. The synthesized ZnO rods were a more stable Wurtzite crystal structure than previously reported ball-shaped ZnO consisting of merging sheets, which was supported by the shifts in PL spectra occurring at ca. 200 degrees C higher annealing temperature, in combination with a smaller thermogravimetric mass loss occurring upon heating the rods to 800 degrees C.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-228274 (URN)10.1021/acs.langmuir.8b01101 (DOI)000431463500016 ()29630844 (PubMedID)2-s2.0-85046301419 (Scopus ID)
Note

QC 20180521

Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2018-05-21Bibliographically approved
Pourrahimi, A. M., Olsson, R. & Hedenqvist, M. S. (2018). The Role of Interfaces in Polyethylene/Metal-Oxide Nanocomposites for Ultrahigh-Voltage Insulating Materials. Advanced Materials, 30(4), Article ID 1703624.
Open this publication in new window or tab >>The Role of Interfaces in Polyethylene/Metal-Oxide Nanocomposites for Ultrahigh-Voltage Insulating Materials
2018 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 30, no 4, article id 1703624Article in journal (Refereed) Published
Abstract [en]

Recent progress in the development of polyethylene/metal-oxide nanocomposites for extruded high-voltage direct-current (HVDC) cables with ultrahigh electric insulation properties is presented. This is a promising technology with the potential of raising the upper voltage limit in today's underground/submarine cables, based on pristine polyethylene, to levels where the loss of energy during electric power transmission becomes low enough to ensure intercontinental electric power transmission. The development of HVDC insulating materials together with the impact of the interface between the particles and the polymer on the nanocomposites electric properties are shown. Important parameters from the atomic to the microlevel, such as interfacial chemistry, interfacial area, and degree of particle dispersion/aggregation, are discussed. This work is placed in perspective with important work by others, and suggested mechanisms for improved insulation using nanoparticles, such as increased charge trap density, adsorption of impurities/ions, and induced particle dipole moments are considered. The effects of the nanoparticles and of their interfacial structures on the mechanical properties and the implications of cavitation on the electric properties are also discussed. Although the main interest in improving the properties of insulating polymers has been on the use of nanoparticles, leading to nanodielectrics, it is pointed out here that larger microscopic hierarchical metal-oxide particles with high surface porosity also impart good insulation properties. The impact of the type of particle and its inherent properties (purity and conductivity) on the nanocomposite dielectric and insulating properties are also discussed based on data obtained by a newly developed technique to directly observe the charge distribution on a nanometer scale in the nanocomposite.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2018
Keywords
charge transport, high-voltage insulation, interfaces, metal-oxide nanoparticles, polyethylene, surface coatings
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-222176 (URN)10.1002/adma.201703624 (DOI)000422932800006 ()2-s2.0-85033689494 (Scopus ID)
Note

QC 20180207

Available from: 2018-02-07 Created: 2018-02-07 Last updated: 2018-02-07Bibliographically approved
Liu, D., Pallon, L. K. H., Pourrahimi, A. M., Zhang, P., Diaz, A., Holler, M., . . . Gedde, U. W. (2017). Cavitation in strained polyethylene/aluminium oxide nanocomposites. European Polymer Journal, 87, 255-265
Open this publication in new window or tab >>Cavitation in strained polyethylene/aluminium oxide nanocomposites
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2017 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 87, p. 255-265Article in journal (Refereed) Published
Abstract [en]

The incorporation of metal oxide (e.g. Al2O3) nanoparticles has a pronounced positive effect on low-density polyethylene (LDPE) as an insulating material for high-voltage direct-current (HVDC) cables, the electrical conductivity being decreased by one to two orders of magnitude and charge species being trapped by the nanoparticles. The risk of debonding between the nanoparticles and the polymer matrix leading to electrical treeing via electrical discharges in the formed cavities was the motivation for this study. Scanning electron microscope (SEM), small-angle X-ray scattering (SAXS) and X-ray ptychographic tomography were used to study a series of LDPE nanocomposites which contained Al2O3 nanoparticles treated with silanes having terminal alkyl groups of different lengths (methyl, octyl and octadecyl). When specimens were subjected to a tensile strain (a typical specimen stretched beyond the onset of necking consisted of three zones according to SEM of specimens that were studied after removal of the external force: an essentially cavitation-free zone with low local plastic strain, a transitional zone in which local plastic strain showed a marked increase and the revealed concentration of permanent cavities increased with increasing plastic strain and a highly strained zone with extensive cavitation), the cavitation occurred mainly at the polymer-nanoparticle interface according to SEM and X-ray ptychographic tomography and according to SEM progressed with increasing plastic strain through an initial phase with no detectable formation of permanent cavities to a period of very fast cavitation and finally almost an order of magnitude slower cavitation. The polymer/nanoparticle interface was fractal before deformation, as revealed by the profile of the Porod region in SAXS, presumably due to the existence of bound polymers at the nanoparticle surface. A pronounced decrease in the interface fractal dimension was observed when the strain exceeded a critical value; a phenomenon attributed to the stress-induced de-bonding of nanoparticles. The strain-dependence of the interface fractal dimension value at low strain levels between composites containing differently treated nanoparticles seems to be an indicator of the strength of the nanoparticle-polymer interface.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Aluminium oxide, Cavitation, Low-density polyethylene, Nanocomposites, Aluminum, DC power transmission, Electric discharges, Fractal dimension, Fractals, HVDC power transmission, Low density polyethylenes, Metal nanoparticles, Metals, Nanoparticles, Plastic deformation, Polyethylenes, Scanning electron microscopy, Silanes, Tomography, X ray scattering, Electrical conductivity, Electrical discharges, Fractal-dimension value, High voltage direct current, Low density polyethylene(LDPE), Nanoparticle surface, Polymer nanoparticles, Tensile strain
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-201939 (URN)10.1016/j.eurpolymj.2016.12.021 (DOI)000395210900022 ()2-s2.0-85008230710 (Scopus ID)
Note

Funding text: The Swedish Foundation for Strategic Research (grant EM11-0022) is thanked for the financial support.

QC 20170307

Available from: 2017-03-07 Created: 2017-03-07 Last updated: 2017-11-29Bibliographically approved
Akhlaghi, S., Pourrahimi, A. M., Christian, S., Martin, B., Mikael S., H. & Ulf W., G. (2017). Effects of ageing conditions on degradation of acrylonitrile butadiene rubber filled with heat-treated ZnO star-shaped particles in rapeseed biodiesel. Polymer degradation and stability
Open this publication in new window or tab >>Effects of ageing conditions on degradation of acrylonitrile butadiene rubber filled with heat-treated ZnO star-shaped particles in rapeseed biodiesel
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2017 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321Article in journal (Refereed) Published
Abstract [en]

The degradation of acrylonitrile butadiene rubber (NBR) after exposure to biodiesel at different oxygen partial pressures in an automated ageing equipment at 80 °C, and in a high-pressure autoclave at 150 °C was studied. The oxidation of biodiesel was promoted by an increase in oxygen concentration, resulting in a larger uptake of fuel in the rubber due to internal cavitation, a greater decrease in the strain-at-break of NBR due to the coalescence of cavity, and a faster increase in the crosslinking density and carbonyl index due to the promotion of the oxidation of NBR. During the high-temperature autoclave ageing, less fuel was absorbed in the rubber, because the formation of hydroperoxides and acids was impeded. The extensibility of NBR aged in the autoclave decreased only slightly due to the cleavage of rubber chains by the biodiesel attack. The degradation of NBR in the absence of carbon black was explained as being due to oxidative crosslinking. The dissolution of ZnO crystals in the acidic components of biodiesel was retarded by removing the inter-particle porosity and surface defects through heat treating star-shaped ZnO particles. The rubber containing heat-treated ZnO particles swelled less in biodiesel than a NBR filled with commercial ZnO nanoparticles, and showed a smaller decrease in the strain-at-break and less oxidative crosslinking.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Acrylonitrile butadiene rubber; Biodiesel; Degradation; Oxidation; Heat treatment; Zinc oxide
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-202418 (URN)10.1016/j.polymdegradstab.2017.02.011 (DOI)000400222500004 ()2-s2.0-85014171938 (Scopus ID)
Note

QC 20170228

Available from: 2017-02-24 Created: 2017-02-24 Last updated: 2017-05-23
Liu, D., Hoang, A. T., Pourrahimi, A. M., Pallon, L. K. H., Nilsson, F., Gubanski, S. M., . . . Gedde, U. W. (2017). Influence of Nanoparticle Surface Coating on Electrical Conductivity of LDPE/Al2O3 Nanocomposites for HVDC Cable Insulations. IEEE transactions on dielectrics and electrical insulation, 24(3), 1396-1404
Open this publication in new window or tab >>Influence of Nanoparticle Surface Coating on Electrical Conductivity of LDPE/Al2O3 Nanocomposites for HVDC Cable Insulations
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2017 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 24, no 3, p. 1396-1404Article in journal (Refereed) Published
Abstract [en]

LDPE/metal oxide nanocomposites are promising materials for future high-voltage DC cable insulation. This paper presents data on the influence of the structure of the nanoparticle coating on the electrical conductivity of LDPE/Al2O3 nanocomposites. Al2O3 nanoparticles, 50 nm in size, were coated with a series of silanes with terminal alkyl groups of different lengths (methyl, n-octyl and n-octadecyl groups). The density of the coatings in vacuum was between 200 and 515 kg m(-3,) indicating substantial porosity in the coating. The dispersion of the nanoparticles in the LDPE matrix was assessed based on statistics for the nearest-neighbor particle distance. The electrical conductivity of the nanocomposites was determined at both 40 and 60 degrees C. The results show that an appropriate surface coating on the nanoparticles allowed uniform particle dispersion up to a filler loading of 10 wt.%, with a maximum reduction in the electrical conductivity by a factor of 35. The composites based on the most porous octyl-coated nanoparticles showed the greatest reduction in electrical conductivity and the lowest temperature coefficient of electrical conductivity of the composites studied.

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
HVDC cable insulation, LDPE/aluminum oxide nanocomposites, particle coating chemistry, particle dispersion, electrical conductivity
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-211613 (URN)10.1109/TDEI.2017.006310 (DOI)000405000300012 ()2-s2.0-85022181728 (Scopus ID)
Funder
Swedish Foundation for Strategic Research , EM11-0022
Note

QC 20170810

Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-08-11Bibliographically approved
Castro-Mayorga, J. L., Fabra, M. J., Pourrahimi, A. M., Olsson, R. T. & Lagaron, J. M. (2017). The impact of zinc oxide particle morphology as an antimicrobial and when incorporated in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) films for food packaging and food contact surfaces applications. Food and Bioproducts Processing, 101, 32-44
Open this publication in new window or tab >>The impact of zinc oxide particle morphology as an antimicrobial and when incorporated in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) films for food packaging and food contact surfaces applications
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2017 (English)In: Food and Bioproducts Processing, ISSN 0960-3085, E-ISSN 1744-3571, Vol. 101, p. 32-44Article in journal (Refereed) Published
Abstract [en]

In this work, zinc oxide (ZnO) micron and nano sized-particles with different morphologies were synthesized by aqueous precipitation and evaluated as antimicrobial agents against foodborne pathogens. The most effective bactericide system was selected to prepare active poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) films by three different methods (i) direct melt-mixing, (ii) melt-mixing of preincorporated ZnO into PHBV18 (18 mol% valerate content) fiber mats made by electrospinning, and, (iii) as a coating of the annealed electrospun PHBV18/ZnO fiber mats over compression molded PHBV. Results showed that ZnO successfully improved the thermal stability of the PHBV18, being the preincorporation method the most efficient in mitigating the negative impact that the PHBV18 had on the thermal stability, barrier and optical properties of the PHBV films. Similar behavior was found for the coating structure although this film showed effective and prolonged antibacterial activity against Listeria monocytogenes. This study highlights the suitability of the PHBV/ZnO nanostructures for active food packaging and food contact surface applications.

Place, publisher, year, edition, pages
Institution of Chemical Engineers, 2017
Keywords
Active Packaging, Antimicrobial activity, Electrospinning, Food contact surfaces, PHBV, ZnO, Antimicrobial agents, Coatings, Microorganisms, Mixing, Optical properties, Packaging machines, Particle size, Pathogens, Precipitation (chemical), Spinning (fibers), Thermodynamic stability, Zinc, Zinc oxide, Anti-bacterial activity, Anti-microbial activity, Aqueous precipitation, Food contact, Listeria monocytogenes, Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), Oxide films
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-202831 (URN)10.1016/j.fbp.2016.10.007 (DOI)000393720400004 ()2-s2.0-84995579579 (Scopus ID)
Note

QC 20170320

Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2017-11-29Bibliographically approved
Akhlaghi, S., Pourrahimi, A. M., Hedenqvist, M., Sjöstedt, C., Bellander, M. & Gedde, U. (2016). Degradation of carbon-black-filled acrylonitrile butadiene rubber in alternative fuels: Transesterified and hydrotreated vegetable oils. Polymer degradation and stability, 123, 69-79
Open this publication in new window or tab >>Degradation of carbon-black-filled acrylonitrile butadiene rubber in alternative fuels: Transesterified and hydrotreated vegetable oils
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2016 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 123, p. 69-79Article in journal (Refereed) Published
Abstract [en]

The deterioration of acrylonitrile butadiene rubber (NBR), a common sealing material in automobile fuel systems, when exposed to rapeseed biodiesel and hydrotreated vegetable oil (HVO) was studied. The fuel sorption was hindered in HVO-exposed rubber by the steric constraints of bulky HVO molecules, but it was promoted in biodiesel-exposed rubber by fuel-driven cavitation in the NBR and by the increase in diffusivity of biodiesel after oxidation. The absence of a tan δ peak of the bound rubber and the appearance of carbon black particles devoid of rubber suggested that the cavitation was made possible in biodiesel-aged rubber by the detachment of bound rubber from particle surfaces. The HVO-exposed NBR showed a small decrease in strain-at-break due to the migration of plasticizer from the rubber, and a small increase in the Young’s modulus due to oxidative crosslinking. A drastic decrease in extensibility and Payne-effect amplitude of NBR on exposure to biodiesel was explained as being due to the damage caused by biodiesel to the continuous network of bound rubber-carbon black. A decrease in the ZnO crystal size with increasing exposure time suggested that the particles are gradually dissolved in the acidic components of oxidized biodiesel. The Zn2+ cations released from the dissolution of ZnO particles in biodiesel promoted the hydrolysis of the nitrile groups of NBR.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Acrylonitrile butadiene rubber, Biodiesel, Bound rubber degradation, HVO
National Category
Other Chemistry Topics Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-181471 (URN)10.1016/j.polymdegradstab.2015.11.019 (DOI)000368204100007 ()2-s2.0-84949575368 (Scopus ID)
Note

QC 20160202

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2017-11-30Bibliographically approved
Abid, F., Ghorbani, H., Pourrahimi, A. M. & Edin, H. E. (2016). Differences in morphology and polarization properties of heat-treated XLPE and LDPE insulation. In: 2016 IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA (IEEE CEIDP): . Paper presented at IEEE Conference on Electrical Insulation and Dielectric Phenomena (IEEE CEIDP), OCT 16-19, 2016, Toronto, CANADA (pp. 113-116). IEEE conference proceedings
Open this publication in new window or tab >>Differences in morphology and polarization properties of heat-treated XLPE and LDPE insulation
2016 (English)In: 2016 IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA (IEEE CEIDP), IEEE conference proceedings, 2016, p. 113-116Conference paper, Published paper (Refereed)
Abstract [en]

Cross-linked polyethylene (XLPE) is the most commonly used insulating material for extruded high voltage cable applications. Degassing is a heat-treatment process that is performed to remove methane from XLPE insulation which is formed during the crosslinking reactions as a by-product. Apart from removing methane, heat-treatment influences the electrical properties through changing the morphology due to annealing and also removal of polar crosslinking by-products. Scanning electron microscopy (SEM) is generally used to observe the changes in crystalline structure of the polymer. Frequency domain spectroscopy (FDS) is widely used to study polarization properties of dielectric materials. In this study these two methods are used for a comparative analysis of XLPE and LDPE subjected to different heat-treatment time, with or without a diffusion barrier. Electrical measurements are performed at room temperature. From the SEM imaging conducted after permanganate acid etching, formation of spherulites due to heat-treatment is not obvious in neither LDPE nor in XLPE. However, distinctions between LDPE and XLPE in SEM micrographs are evident. From studies with dielectric polarization spectroscopy, it is found that the LDPE samples are less sensitive to heat-treatment in comparison to the XLPE samples while dissipation factor of XLPE samples are influenced by the choice of pressing film used during sample preparation.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2016
Series
Conference on Electrical Insulation and Dielectric Phenomena Annual Report, ISSN 0084-9162
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-201296 (URN)10.1109/CEIDP.2016.7785567 (DOI)000391639700024 ()2-s2.0-85009784397 (Scopus ID)978-1-5090-4654-6 (ISBN)
Conference
IEEE Conference on Electrical Insulation and Dielectric Phenomena (IEEE CEIDP), OCT 16-19, 2016, Toronto, CANADA
Note

QC 20170214

Available from: 2017-02-14 Created: 2017-02-14 Last updated: 2017-03-07Bibliographically approved
Liu, D., Pourrahimi, A. M., Pallon, L. K. H., Sanchez, C. C., Olsson, R. T., Hedenqvist, M. S., . . . Gedde, U. W. (2016). Interactions between a phenolic antioxidant, moisture, peroxide and crosslinking by-products with metal oxide nanoparticles in branched polyethylene. Polymer degradation and stability, 125, 21-32
Open this publication in new window or tab >>Interactions between a phenolic antioxidant, moisture, peroxide and crosslinking by-products with metal oxide nanoparticles in branched polyethylene
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2016 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 125, p. 21-32Article in journal (Refereed) Published
Abstract [en]

Polyethylene composites based on metal oxide nanoparticles are emerging materials for use in the insulation of extruded HVDC cables. The short-term electrical performance of these materials is adequate, but their stability for extended service needs to be assessed. This study is focussed on the capacity of the nanoparticles to adsorb polar species (water, dicumyl peroxide and byproducts from peroxide-vulcanisation, acetophenone and cumyl alcohol) that have an impact on the electrical conductivity of nanocomposites, the oxidative stability by adsorption of phenolic antioxidants on the nanoparticles and the potential transfer of catalytic impurities from the nanoparticles to the polymer. The adsorption of water, dicumyl peroxide, acetophenone, cumyl alcohol and Irganox 1076 (phenolic antioxidant) on pristine and coated (hydrophobic silanes and poly(lauryl methacrylate)) Al2O3, MgO and ZnO particles ranging from 25 nm to 2 gm was assessed. Composites based on low-density polyethylene and the particles mentioned (<= 12 wt.%) were prepared, the degree of adsorption of Irganox 1076 onto the particles was assessed by OIT measurements, and the release of volatile species at elevated temperature was assessed by TG. The concentration of moisture adsorbed on the particles at 25 degrees C increased linearly with both increasing hydroxyl group concentration on the particle surfaces and increasing relative humidity. Dicumyl peroxide showed no adsorption on any of the nanoparticles. Acetophenone and cumyl alcohol showed a linear increase in adsorption with increasing concentration of hydroxyl groups, but the quantities were much smaller than those of water. Irganox 1076 adsorbed only onto the uncoated nanoparticles. Uncoated ZnO nanoparticles that contained ionic species promoted radical formation and a lowering of the OIT. This study showed that carefully coated pure metal oxide nano particles are not likely to adsorb phenolic antioxidants or dicumyl peroxide, but that they have the capacity to adsorb moisture and polar byproducts from peroxide vulcanisation, and that they will not introduce destabilizing ionic species into the polymer matrix. Low contents of dry, equiaxed ZnO and MgO particles strongly retarded the release of volatile species at temperatures above 300 degrees C.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Polyethylene, Metal oxide nanoparticles, Water, Acetophenone, Cumyl alcohol, Phenolic antioxidant, Adsorption
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-184031 (URN)10.1016/j.polymdegradstab.2015.12.014 (DOI)000370894900003 ()2-s2.0-84954186925 (Scopus ID)
Note

QC 20160324

Available from: 2016-03-24 Created: 2016-03-22 Last updated: 2017-11-30Bibliographically approved
Strain, I. N., Wu, Q., Pourrahimi, A. M., Hedenqvist, M. S., Olsson, R. T. & Andersson, R. L. (2015). Electrospinning of recycled PET to generate tough mesomorphic fibre membranes for smoke filtration. Journal of Materials Chemistry A, 3(4), 1632-1640
Open this publication in new window or tab >>Electrospinning of recycled PET to generate tough mesomorphic fibre membranes for smoke filtration
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2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, no 4, p. 1632-1640Article in journal (Refereed) Published
Abstract [en]

Tough fibrous membranes for smoke filtration have been developed from recycled polyethylene terephthalate (PET) bottles by solution electrospinning. The fibre thicknesses were controlled from 0.4 to 4.3 mu m by adjustment of the spinning conditions. The highest fibre strength and toughness were obtained for fibres with an average diameter of 1.0 mu m, 62.5 MPa and 65.8 MJ m(-3), respectively. The X-ray diffraction (XRD) patterns of the fibres showed a skewed amorphous halo, whereas the differential scanning calorimetry (DSC) results revealed an apparent crystallinity of 6-8% for the 0.4 and 1 mu m fibres and 0.2% crystallinity for the 4.3 mu m fibres. Heat shrinkage experiments were conducted by exposing the fibres to a temperature above their glass transition temperature (T-g). The test revealed a remarkable capability of the thinnest fibres to shrink by 50%, which was in contrast to the 4.3 mu m fibres, which displayed only 4% shrinkage. These thinner fibres aka showed a significantly higher glass transition temperature (+15 degrees C) than that of the 4.3 mu m fibres. The results suggested an internal morphology with a high degree of molecular orientation in the amorphous segments along the thinner fibres, consistent with a constrained mesomorphic phase formed during their rapid solidification in the electric field. Air filtration was demonstrated with cigarette smoke as a model substance passed through the fibre mats. The 0.4 mu m fibres showed the most effective smoke filtration and a capacity to absorb 43x its own weight in smoke residuals. whereas the 1 mu m fibres showed the best combination of filtration capacity (32x) and mechanical robustness. The use of recycled PET in the form of nanofibres is a novel way of turning waste into higher-value products.

Keywords
Differential scanning calorimetry, Electric fields, Electrospinning, Fibrous membranes, Filtration, Glass, Glass transition, Microfiltration, Molecular orientation, Plastic bottles, Polyethylenes, Rapid solidification, Recycling, Shrinkage, Smoke, Spinning (fibers), Temperature, X ray diffraction, Average diameter, Cigarette smokes, Filtration capacity, Internal morphology, Mechanical robustness, Mesomorphic phase, Recycled polyethylene terephthalates, Spinning conditions
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-159360 (URN)10.1039/c4ta06191h (DOI)000346906100035 ()2-s2.0-84919884625 (Scopus ID)
Note

QC 20150130

Available from: 2015-01-30 Created: 2015-01-29 Last updated: 2017-12-05Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5867-0531

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