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论文类型：期刊论文
发表时间：2013-08-08
发表刊物：PHYSICAL REVIEW LETTERS
收录刊物：SCIE、EI、Scopus
卷号：111
期号：6
ISSN号：0031-9007
摘要：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.