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Soft Matter Vol - 13 Issue - 4

Soft Matter Vol - 13 Issue - 3

Soft Matter Vol - 13 Issue - 2

Closer insight into the structure of moderate to densely branched comb polymers by combining modelling and linear rheological measurements

Content Provider	Royal Society of Chemistry (RSC)
Author	Gohy, Jean-Francois Pioge, Sandie Fustin, Charles-Andre Ruymbeke, Evelyne Ahmadi, Mostafa
Copyright Year	2017
Abstract	Synthesis of combs with well-entangled backbones and long branches with high densities has always been a challenge. Steric hindrance frequently leads to coupling of chains and structural imperfections that cannot be easily distinguished by traditional characterization methods. Research studies have therefore tried to use a combination of different methods to obtain more information on the actual microstructures. In this work, a grafting-from approach is used to synthesize poly(n-butyl acrylate) combs using atom transfer radical polymerization (ATRP) in three steps including the synthesis of a backbone, cleavage of protecting groups and growth of side branches. We have compared the linear viscoelastic properties theoretically predicted by a time marching algorithm (TMA) tube based model with the measured rheological behaviour to provide a better insight into the actual microstructure formed during synthesis. For combs with branches smaller than an entanglement, no discernible hierarchical relaxation can be distinguished, while for those with longer branches, a high frequency plateau made by entangled branches can be separated from backbone's relaxation. Dilution of the backbone, after relaxation of side branches, may accelerate the final relaxation, while extra friction can delay it especially for longer branches. Such a comparison provides a better assessment of the microstructure formed in combs.
Starting Page	1063
Ending Page	1073
Page Count	11
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	13
Issue Number	5
Journal	Soft Matter
DOI	10.1039/c6sm02576e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Atom-transfer radical-polymerization Viscoelasticity Plateau Rheology Acrylate TMA Steric effects Steric Algorithm Trimethoxyamphetamine
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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Closer insight into the structure of moderate to densely branched comb polymers by combining modelling and linear rheological measurements

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