Molecular Dynamics of Polyfarnesene,Macromolecules

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Molecular Dynamics of Polyfarnesene
Macromolecules ( IF 5.1 ) Pub Date : 2018-06-28 00:00:00 , DOI: 10.1021/acs.macromol.8b00851
Ciprian Iacob _{1,

2} , Taejun Yoo ₃ , James Runt ₁

Affiliation

This paper represents the first comprehensive report of the molecular weight dependence of the dynamics of polyfarnesene (PF), utilizing oscillatory shear rheology and broadband dielectric spectroscopy. Extended PF chain conformations arising from tightly packed C11/C13 pendant groups reduce the probability of chain entanglements and lead to Rouse-like melt dynamics up to a critical molecular weight ∼10⁵ g/mol. At higher molecular weights, PF behaves as an entangled polymer melt. Dielectric spectroscopy measurements establish PF as a type-A polymer, whose normal mode relaxation is strongly dependent on molecular weight, providing a compliment to melt rheology for the exploration of PF global chain dynamics.

中文翻译：

聚法呢烯的分子动力学

本文是利用振荡剪切流变学和宽带介电谱技术对聚法呢烯（PF）动力学的分子量依赖性进行的首次综合报道。紧密堆积的C11 / C13侧基产生的扩展PF链构象降低了链缠结的可能性，并导致了类似于Rouse的熔体动力学，直至临界分子量约为^{10 5} g / mol。在较高分子量下，PF表现为纠缠的聚合物熔体。介电谱测量将PF确定为A型聚合物，其正常模式弛豫高度依赖于分子量，为熔体流变学的研究提供了补充，以探索PF整体链动力学。

更新日期：2018-06-28

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