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Publications (8 of 8) Show all publications
Scaffaro, R., Maio, A., Lo Re, G., Parisi, A. & Busacca, A. (2018). Advanced piezoresistive sensor achieved by amphiphilic nanointerfaces of graphene oxide and biodegradable polymer blends. Composites Science And Technology, 156, 166-176
Open this publication in new window or tab >>Advanced piezoresistive sensor achieved by amphiphilic nanointerfaces of graphene oxide and biodegradable polymer blends
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2018 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 156, p. 166-176Article in journal (Refereed) Published
Abstract [en]

This work focuses on the preparation of a piezoresistive sensor device, by exploiting an amphiphilic sample of graphene oxide (GO) as a compatibilizer for poly (lactic acid) (PLA)-Poly (ethylene-glycol) (PEG) blends. The presence of GO determined a high stiffening and strengthening effect, without affecting toughness, and allowed a good stability of mechanical properties up to 40 days. Moreover, GO endowed the materials with electrical properties highly sensitive to pressure and strain variations: the biodegradable pressure sensor showed a responsivity of 35 μA/MPa from 0.6 to 8.5 MPa, a responsivity around 19 μA/MPa from 8.5 to 25 MPa. For lower pressure values (around 0.16–0.45 MPa), instead, the responsivity increases up to 220 μA/MPa in terms of ΔI/ΔP (i.e. (ΔI/ΔI0)/P close to 1 kPa−1). Furthermore, this novel sensor is able to monitor submicrometric displacements with an impressive sensitivity (up to 25 μA/μm in terms of ΔI/ΔL, or 70 in terms of (ΔI/I0)/ε). We implemented a model able to predict pressure changes up to 25 MPa, by monitoring and measuring variations in electrical conductivity, thus paving the road to use these biodegradable, ecofriendly materials as low-cost sensors for a large pressure range.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Dynamic mechanical thermal analysis (DMTA), Graphene, Interphase, Polymer-matrix composites (PMCs), Raman spectroscopy
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-225008 (URN)10.1016/j.compscitech.2018.01.008 (DOI)000426234600020 ()2-s2.0-85043985840 (Scopus ID)
Note

QC 20180328

Available from: 2018-03-28 Created: 2018-03-28 Last updated: 2018-03-28Bibliographically approved
Larsson, P. A., Linvill, E., Lo Re, G., Östlund, S. & Wågberg, L. (2018). Ductile and thermoplastic cellulose with novel application and design opportunities. Paper presented at 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA. Abstracts of Papers of the American Chemical Society, 255
Open this publication in new window or tab >>Ductile and thermoplastic cellulose with novel application and design opportunities
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2018 (English)In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 255Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240162 (URN)000435537703079 ()
Conference
255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA
Note

QC 20190111

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-05-10Bibliographically approved
Lo Re, G., Engström, J., Wu, Q., Malmström, E., Gedde, U. W., Olsson, R. & Berglund, L. (2018). Improved Cellulose Nanofibril Dispersion in Melt-Processed Polycaprolactone Nanocomposites by a Latex-Mediated Interphase and Wet Feeding as LDPE Alternative. ACS Applied Nano Materials, 1(6), 2669-2677
Open this publication in new window or tab >>Improved Cellulose Nanofibril Dispersion in Melt-Processed Polycaprolactone Nanocomposites by a Latex-Mediated Interphase and Wet Feeding as LDPE Alternative
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2018 (English)In: ACS Applied Nano Materials, ISSN 2574-0970, Vol. 1, no 6, p. 2669-2677Article in journal (Refereed) Published
Abstract [en]

This work reports the development of a sustainable and green one-step wet-feeding method to prepare tougher and stronger nanocomposites from biodegradable cellulose nanofibrils (CNF)/polycaprolactone (PCL) constituents, compatibilized with reversible addition fragmentation chain transfer-mediated surfactant-free poly(methyl methacrylate) (PMMA) latex nanoparticles. When a PMMA latex is used, a favorable electrostatic interaction between CNF and the latex is obtained, which facilitates mixing of the constituents and hinders CNF agglomeration. The improved dispersion is manifested in significant improvement of mechanical properties compared with the reference material. The tensile tests show much higher modulus (620 MPa) and strength (23 MPa) at 10 wt % CNF content (compared to the neat PCL reference modulus of 240 and 16 MPa strength), while maintaining high level of work to fracture the matrix (7 times higher than the reference nanocomposite without the latex compatibilizer). Rheological analysis showed a strongly increased viscosity as the PMMA latex was added, that is, from a well-dispersed and strongly interacting CNF network in the PCL.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-241449 (URN)10.1021/acsanm.8b00376 (DOI)000461400700029 ()
Note

QC 20190123

Available from: 2019-01-22 Created: 2019-01-22 Last updated: 2019-04-23Bibliographically approved
Lo Re, G., Spinella, S., Boujemaoui, A., Vilaseca, F., Larsson, P. T., Adås, F. & Berglund, L. (2018). Poly(ε-caprolactone) Biocomposites Based on Acetylated Cellulose Fibers and Wet Compounding for Improved Mechanical Performance. ACS Sustainable Chemistry & Engineering, 5(6), 6753-6760
Open this publication in new window or tab >>Poly(ε-caprolactone) Biocomposites Based on Acetylated Cellulose Fibers and Wet Compounding for Improved Mechanical Performance
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2018 (English)In: ACS Sustainable Chemistry & Engineering, ISSN 2168-0485, Vol. 5, no 6, p. 6753-6760Article in journal, Editorial material (Refereed) Published
Abstract [en]

Poly(epsilon-caprolactone) (PCL) is a ductile thermoplastic, which is biodegradable in the marine environment. Limitations include low strength, petroleum-based origin, and comparably high cost. Cellulose fiber reinforcement is therefore of interest although uniform fiber dispersion is a challenge. In this study, a one-step wet compounding is proposed to validate a sustainable and feasible method to improve the dispersion of the cellulose fibers in hydrophobic polymer matrix as PCL, which showed to be insensitive to the presence of the water during the processing. A comparison between unmodified and acetylated cellulosic wood fibers is made to further assess the net effect of the wet feeding and chemical modification on the biocomposites properties, and the influence of acetylation on fiber structure is reported (ATR-FTIR, XRD). Effects of processing on nano fibrillation, shortening, and dispersion of the cellulose fibers are assessed as well as on PCL molar mass. Mechanical testing, dynamic mechanical thermal analysis, FE-SEM, and X-ray tomography is used to characterize composites. With the addition of 20 wt % cellulosic fibers, the Young's modulus increased from 240 MPa (neat PCL) to 1850 MPa for the biocomposites produced by using the wet feeding strategy, compared to 690 MPa showed for the biocomposites produced using dry feeling. A wet feeding of acetylated cellulosic fibers allowed even a greater increase, with an additional 46% and 248% increase of the ultimate strength and Young's modulus, when compared to wet feeding of the unmodified pulp, respectively.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Polymer Technologies
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-225425 (URN)10.1021/acssuschemeng.8b00551 (DOI)000431927500117 ()2-s2.0-85046751578 (Scopus ID)
Note

QC 20180531

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-06-04Bibliographically approved
Soeta, H., Lo Re, G., Masuda, A., Fujisawa, S., Saito, T., Berglund, L. & Isogai, A. (2018). Tailoring Nanocellulose-Cellulose Triacetate Interfaces by Varying the Surface Grafting Density of Poly(ethylene glycol). ACS OMEGA, 3(9), 11883-11889
Open this publication in new window or tab >>Tailoring Nanocellulose-Cellulose Triacetate Interfaces by Varying the Surface Grafting Density of Poly(ethylene glycol)
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2018 (English)In: ACS OMEGA, ISSN 2470-1343, Vol. 3, no 9, p. 11883-11889Article in journal (Refereed) Published
Abstract [en]

Careful design of the structures of interfaces between nanofillers and polymer matrices can significantly improve the mechanical and'thermal' properties of the overall nanocomposites. Here, we investigate]how the grafting density on the surface of nanocelluloses influences the properties of nanocellulose/cellulose triacetate (CTA) composites. 2,2,6,6 The surface of nanocellulose, which was preparedby tetramethylpiperidine-l-oxyl oxidation, was modified with long poly(ethylene glycol) (PEG) chains at different grafting_ densities. The PEG -grafted nanocelluloses were h omogene ously embedded in CTA matrices. The mechanical and thermal properties of the nanocomposites were characterized. Increasing the grafting density caused the soft PEG chains to form denser and thicker layers around the rigid nanocelluloses. The PEG layers were not completely miscible with the CTA matrix. This structure consfderably enhanced the energy dissipation by allowing sliding at the interface, which increased the toughness of the nanocomposites. The thermal and mechanical properties of the composites could be tailored by controlling the grafting density. These findings provide a deeper understanding about interfacial design for nanocellulose-based composite materials.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-237134 (URN)10.1021/acsomega.8b01616 (DOI)000446186000155 ()2-s2.0-85053900926 (Scopus ID)
Note

QC 20181025

Available from: 2018-10-25 Created: 2018-10-25 Last updated: 2018-10-25Bibliographically approved
Gioia, C., Lo Re, G., Lawoko, M. & Berglund, L. (2018). Tunable thermosetting epoxies based on fractionated and well-characterized lignins. Journal of the American Chemical Society
Open this publication in new window or tab >>Tunable thermosetting epoxies based on fractionated and well-characterized lignins
2018 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126Article in journal, Editorial material (Refereed) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-225423 (URN)10.1021/jacs.7b13620 (DOI)000428356000035 ()2-s2.0-85044202575 (Scopus ID)
Note

QC 20180525

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-10-19Bibliographically approved
Lo Re, G. & Sessini, V. (2018). Wet feeding approach for cellulosic materials/PCL Biocomposites. In: Biomass Extrusion and Reaction Technologies: Principles to Practices and Future Potential (pp. 209-226). American Chemical Society (ACS)
Open this publication in new window or tab >>Wet feeding approach for cellulosic materials/PCL Biocomposites
2018 (English)In: Biomass Extrusion and Reaction Technologies: Principles to Practices and Future Potential, American Chemical Society (ACS), 2018, p. 209-226Chapter in book (Refereed)
Abstract [en]

In the past decades, cellulosic materials attracted increasing interest for their potential as reinforcement in bioplastics due to their intrinsic strength and light weight, although uniform fiber dispersion is a challenge. Among biodegradable polyesters, polycaprolactone (PCL) has regained attention for its biodegradability in marine environment together with its ductility. Its low strength, petroleum-based origin and comparably high cost, limit the use of PCL. PCL, therefore, is a good candidate for beneficial effect of cellulose material addition for the preparation of biodegradable composites with improved properties. A one-step wet compounding is reported in this chapter to validate a sustainable method to improve the cellulose dispersion in a hydrophobic polymer matrix as PCL. A comparison between cellulosic wood pulp fibers, microfibrillated cellulose and nanofibrils is made to assess the feasibility of the wet feeding approach for the processing of the biocomposites. Assessment of matrix molar mass demonstrated that PCL is insensitive to the presence of the water during the melt compounding. FE-SEM and X-ray tomography was used to characterize the morphology and to evaluate the nanofibrillation. Tensile tests were carried out to evaluate the mechanical properties of the biocomposites. The shortening and dispersion of the cellulose fibers after the melt processing were evaluated. Young's modulus values indicated that the wet feeding approach improve the dispersion of the cellulose and resulted in enhanced mechanical properties of the biocomposites. The beneficial effect of the wet feeding approach was greater for the pulp fibers compared to the microfibrillated cellulose or the nanofibrils due to a more efficient melt processing and more significant effect on the preservation of the fiber length and their aspect ratio.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Series
ACS Symposium Series, ISSN 0097-6156 ; 1304
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-238403 (URN)10.1021/bk-2018-1304.ch011 (DOI)2-s2.0-85052301145 (Scopus ID)9780841233713 (ISBN)
Note

QC 20181112

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2018-11-12Bibliographically approved
Lo Re, G., Spinella, S., Vilaseca, F. & Berglund, L. (2017). Melt-processing of cellulose pulp and polycaprolactone composites: Wet feeding approach to improve the filler dispersion. Paper presented at 253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes, APR 02-06, 2017, San Francisco, CA. Abstract of Papers of the American Chemical Society, 253
Open this publication in new window or tab >>Melt-processing of cellulose pulp and polycaprolactone composites: Wet feeding approach to improve the filler dispersion
2017 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 253Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-243610 (URN)000430568503350 ()
Conference
253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes, APR 02-06, 2017, San Francisco, CA
Note

QC 20190206

Available from: 2019-02-06 Created: 2019-02-06 Last updated: 2019-02-06Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-8840-1172

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