Entanglement Dynamics in Miscible Polyisoprene/Poly(p-tert-butylstyrene) Blends
Entanglement Dynamics in Miscible Polyisoprene/Poly(p-tert-butylstyrene) Blends
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DOI：
10.1021/ma102596b
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
H. Watanabe;Quan Chen;Yohji Kawasaki;Yumi Matsumiya;Tadashi Inoue;O. Urakawa
中科院分区：
文献类型：
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作者：
H. Watanabe;Quan Chen;Yohji Kawasaki;Yumi Matsumiya;Tadashi Inoue;O. Urakawa
研究了高分子量顺式聚异戊二烯（PI）和聚对叔丁基苯乙烯（PtBS）共混物的粘弹性、介电和流变光学行为。共混物的缓慢介电弛豫完全归因于具有a型偶极子的PI链的全局运动。PI和PtBS链表现为快速和慢速（低摩擦和高摩擦）组件，并且彼此纠缠良好。在高温度下，共混物呈现出存储模量G′（ω）的两步纠缠平台，并且在高角频率和低角频率（ω）处的平台分别归因于各组分链之间和PtBS链之间的纠缠。基于库恩段数分数n的简单混合规则a = nPIaPIbulk + nPtBSaPtBSbulk，可以很好地描述表征高ω平台的纠缠长度a。这个结果是一致的……
Viscoelastic, dielectric, and rheo-optical behavior was examined for miscible blends of high-M cis-polyisoprene (PI) and poly(p-tert-butylstyrene) (PtBS). The slow dielectric relaxation of the blends was exclusively attributed to the global motion of the PI chains having the type-A dipoles. The PI and PtBS chains behaved as the fast and slow (low- and high-friction) components and were well entangled with each other. The dynamics of these chains changed significantly with temperature T. At high T, the blend exhibited two-step entanglement plateau of the storage modulus G′(ω), and the plateaus at high and low angular frequencies (ω) were attributed, with the aid of the dielectric data, to the entanglement among all component chains and that between the PtBS chains, respectively. The entanglement length a characterizing the high-ω plateau was well described by a simple mixing rule based on the number fraction n of the Kuhn segments of the components, a = nPIaPIbulk + nPtBSaPtBSbulk. This result was consiste...