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Polymer nanocomposites: Insights on rheology, percolation and molecular mobility
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0003-1775-8160
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.
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2018 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 153, p. 52-60Article in journal (Refereed) Published
Abstract [en]

The integration of carbon nanotubes (CNTs) into a polymer matrix strongly affects the rheological behavior that in turn may hamper the overall performance of the resulting composite. Research in this topic has focused on bulk rheological properties, while here we employ NMR diffusion experiments to explore the mobility (diffusivity) of epoxy molecules when loaded with CNTs. Rheology and light microscopy indicate percolation of CNT aggregates. Those aggregates cage a substantial amount of epoxy molecules while small angle X-ray scattering indicates some rearrangement of epoxy molecules in the vicinity of the nanotubes. NMR diffusion experiments distinguish between the slow diffusion of the caged molecules and that of the free ones, and relate the fraction of the former to the macroscopic system viscosity. The demonstrated surface-induced slowing-down of diffusion is attributed to strong intermolecular π-π interactions among the epoxy molecules, and between them and the CNT surface. These findings demonstrate the utility of NMR diffusion experiments as an additional method applied to nanocomposites. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 153, p. 52-60
Keywords [en]
Nanocomposites, NMR diffusion, Rheology, Aggregates, Carbon nanotubes, Diffusion, Elasticity, Molecules, Solvents, X ray scattering, Yarn, Macroscopic systems, Molecular mobility, Pi interactions, Polymer nanocomposite, Rheological behaviors, Rheological property, Slow diffusion, Polymer matrix composites
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-236679DOI: 10.1016/j.polymer.2018.07.079ISI: 000445783300007Scopus ID: 2-s2.0-85053160650OAI: oai:DiVA.org:kth-236679DiVA, id: diva2:1262781
Funder
Swedish Research Council, CA15107
Note

Export Date: 22 October 2018; Article; CODEN: POLMA; Correspondence Address: Nadiv, R.; Department of Chemical Engineering, Ben-Gurion University of the NegevIsrael; email: roeynadiv@gmail.com; Funding details: NORTE-01-0145-FEDER-000028; Funding details: UID/QUI/00081/2013; Funding details: POCI-01-0145-FEDER-006980; Funding details: CA15107; Funding details: Aichi Science and Technology Foundation; Funding details: COST, European Cooperation in Science and Technology; Funding details: FCT, Fuel Cell Technologies Program; Funding text: The authors are grateful for excellent technical support by Dr. Jürgen Jopp (Light microscopy). The authors are grateful for excellent technical support by Carmen Tamburu and Prof. Uri Raviv (SAXS). The authors acknowledge useful discussions with Dr. Gleb Vasilyev. This article is based upon work from COST action CA15107 (MultiComp), supported by COST (European Cooperation in Science and Technology) and the Swedish Research Council VR. RF also acknowledges the CIQUP and the Science and Technology Foundation (FCT), Portugal , and FEDER/COMPETE for financial support through grants UID/QUI/00081/2013 , POCI-01-0145-FEDER-006980 and NORTE-01-0145-FEDER-000028 . Appendix A

Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2018-11-13Bibliographically approved

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Fernandes, Ricardo M. F.Dai, JingFuro, Istvan

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