Entanglement Dynamics in Miscible Polyisoprene/Poly(p-tert-butylstyrene) Blends

Autor:	Hiroshi Watanabe, Tadashi Inoue, Quan Chen, Yumi Matsumiya, Yohji Kawasaki, Osamu Urakawa
Rok vydání:	2011
Předmět:	Materials science Polymers and Plastics Condensed matter physics Organic Chemistry Relaxation (NMR) Quantum entanglement Dynamic mechanical analysis Dielectric Plateau (mathematics) Viscoelasticity Inorganic Chemistry Dipole Chemical physics Materials Chemistry Kuhn length
Zdroj:	Macromolecules. 44:1570-1584
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma102596b
Popis:	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...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1a3ec9bad2baf415724e9da2ec47dcc3 https://doi.org/10.1021/ma102596b Zobrazit plný text záznamu