Strain hardening in startup shear of long-chain branched polymer solutions

We show for the first time that entangled polymeric liquids containing long-chain branching can exhibit strain hardening upon startup shear. As the significant long-chain branching impedes chain disentanglement, Gaussian coils between entanglements can deform to reach the finite extensibility limit...

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Bibliographic Details
Published in:	Physical review letters Vol. 111; no. 6; p. 068302
Main Authors:	Liu, Gengxin, Cheng, Shiwang, Lee, Hyojoon, Ma, Hongwei, Xu, Hongde, Chang, Taihyun, Quirk, Roderic P, Wang, Shi-Qing
Format:	Journal Article
Language:	English
Published:	United States 08-08-2013
Online Access:	Get full text
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Summary:	We show for the first time that entangled polymeric liquids containing long-chain branching can exhibit strain hardening upon startup shear. As the significant long-chain branching impedes chain disentanglement, Gaussian coils between entanglements can deform to reach the finite extensibility limit where the intrachain retraction force exceeds the value expected from the usual conformational entropy loss evaluated based on Gaussian chain statistics. The phenomenon is expected to lead to further theoretical understanding.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.111.068302