Lu, B, Lamnawar, K, Maazouz, A et al. (1 more author) (2016) Revealing the dynamic heterogeneity of PMMA/PVDF blends: From microscopic dynamics to macroscopic properties. Soft Matter, 12 (13). pp. 3252-3264. ISSN 1744-683X
Abstract
An effort was made to demonstrate the dynamic heterogeneity of poly(methyl methacrylate) (PMMA)/poly(vinylidene fluoride) (PVDF) blends, where its composition dependence and the role of interphase were probed. Firstly, the composition dependence of thermorheological complexity of PMMA/PVDF blends in the melt was revealed. The molecular entanglement state involving intra- and interchain entanglements was found to govern the scenario of thermorheological complexity. Intriguingly, local heterogeneity was further demonstrated to exist in the melt-state blends with intermediate compositions, and its origin was depicted to be the interphase. The interphase, coupled with unfavourable interchain entanglements in those blends, could explain the reduced viscosity and speed-up relaxations, contributing to the overall thermorheological complexity. Besides, two experimental glass transition temperatures of blends were resolved in view of segment motions in the miscible phase and the crystal-amorphous interphase, and further assessed via the "self-concentration" concept. The presence of a crystal-amorphous interphase, likely leading to three distinct dynamics of segments in blends, was supposed to contribute to the dynamic heterogeneity in segment relaxations for PMMA/PVDF blends in the solid state. Lastly, effects of dynamic heterogeneity on dynamic mechanical properties were also evaluated.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Dec 2016 15:04 |
Last Modified: | 21 Dec 2016 15:04 |
Published Version: | https://doi.org/10.1039/c5sm02659h |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Identification Number: | 10.1039/c5sm02659h |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:109825 |