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Temperature-dependent surface nanomechanical properties of a thermoplastic nanocomposite
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. Shandong University, China.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.ORCID iD: 0000-0003-3201-5138
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2017 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 494, 204-214 p.Article in journal (Refereed) Published
Abstract [en]

In polymer nanocomposites, particle-polymer interactions influence the properties of the matrix polymer next to the particle surface, providing different physicochemical properties than in the bulk matrix. This region is often referred to as the interphase, but detailed characterization of its properties remains a challenge. Here we employ two atomic force microscopy (AFM) force methods, differing by a factor of about 15 in probing rate, to directly measure the surface nanomechanical properties of the transition region between filler particle and matrix over a controlled temperature range. The nanocomposite consists of poly(ethyl methacrylate) (PEMA) and poly(isobutyl methacrylate) (PiBMA) with a high concentration of hydrophobized silica nanoparticles. Both AFM methods demonstrate that the interphase region around a 40-nm-sized particle located on the surface of the nanocomposite could extend to 55–70 nm, and the interphase exhibits a gradient distribution in surface nanomechanical properties. However, the slower probing rate provides somewhat lower numerical values for the surface stiffness. The analysis of the local glass transition temperature (Tg) of the interphase and the polymer matrix provides evidence for reduced stiffness of the polymer matrix at high particle concentration, a feature that we attribute to selective adsorption. These findings provide new insight into understanding the microstructure and mechanical properties of nanocomposites, which is of importance for designing nanomaterials.

Place, publisher, year, edition, pages
Academic Press, 2017. Vol. 494, 204-214 p.
Keyword [en]
Atomic force microscopy, Interphase, Nanomechanical properties, Thermoplastic nanocomposite
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-203220DOI: 10.1016/j.jcis.2017.01.096ScopusID: 2-s2.0-85011072447OAI: oai:DiVA.org:kth-203220DiVA: diva2:1081446
Note

QC 20170317

Available from: 2017-03-14 Created: 2017-03-14 Last updated: 2017-03-17Bibliographically approved
In thesis
1. Electrochemical Application and AFM Characterization of Nanocomposites: Focus on Interphase Properties
Open this publication in new window or tab >>Electrochemical Application and AFM Characterization of Nanocomposites: Focus on Interphase Properties
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of graphene and conductive polyaniline nanomaterials in the field of electrochemistry is increasing due to their excellent conductivity, rapid electron transfer and high specific surface area. However, these properties are strongly dependent on the preparation processes. To accelerate the development of advanced electrochemical sensors for the simultaneous detection of trace amounts of heavy metal ions, two facile and green methods are proposed to improve their performance in this thesis. The first one was dedicated to make graphene-carbon nanotube hybrid nanocomposites. The introduction of carbon nanotubes not only greatly enhances the conductivity of graphene but also suppresses, to some degree, the aggregation between graphene nanosheets. Another method proposed in this thesis work was to synthesize a phytic acid doped polyaniline nanofiber based nanocomposite. The synergistic contribution from polyaniline nanofibers and phytic acid enhances the accumulation efficiency and the charge transfer rate of metal ions during the differential pulse anodic stripping voltammetry analysis. The above-mentioned nanocomposite modified electrodes were all successfully applied to real samples for the simultaneous detection of Cd2+ and Pb2+ with good recovery rates. Meanwhile, corrosion protection is another important branch in the field of electrochemistry. In this direction, an active alkyd-polyaniline composite coating with self-healing functionality was prepared. The polyaniline used in this thesis was doped with p-toluene sulfonic acid, which was employed to increase the conductivity of polyaniline, and 1 wt.% of as-prepared polyaniline nanoparticles were found to offer an effective conductive network for anticorrosion. Finally, the reasons that such low loading levels of nanomaterials can result in significantly reinforced properties in nanocomposites were studied with combined atomic force microscopy (AFM) techniques. The results demonstrated that the interphase for a 40-nm-sized silica particle could extend to 55–70 nm in poly(ethyl methacrylate) (PEMA) and poly(isobutyl methacrylate) (PiBMA) polymer matrix, and the interphase exhibited a gradient distribution in surface nanomechanical properties.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 72 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2017:13
Keyword
Electrochemical sensor, nanocomposite, graphene, carbon nanotubes, phytic acid, polyaniline, corrosion protection, silica nanoparticles, atomic force microscopy, interphase
National Category
Materials Chemistry
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-203239 (URN)978-91-7729-285-2 (ISBN)
Public defence
2017-03-10, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170315

Available from: 2017-03-15 Created: 2017-03-14 Last updated: 2017-03-17Bibliographically approved

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