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Viscoelastic properties of polyarylene ether nitriles/thermotropic liquid crystalline polymer blend
Author(s) -
Wu Defeng,
Zhang Yisheng,
Wu Lanfeng,
Jin Lifeng,
Zhang Ming,
Zhou Weidong,
Yan Changhao
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27837
Subject(s) - thermotropic crystal , viscoelasticity , rheometer , materials science , time–temperature superposition , shear rate , composite material , polymer blend , stress relaxation , phase (matter) , polymer , shear flow , viscosity , relaxation (psychology) , rheology , polymer chemistry , liquid crystalline , thermodynamics , chemistry , organic chemistry , copolymer , creep , psychology , social psychology , physics
Abstract Polyarylene ether nitriles (PEN)/thermotropic liquid crystalline polymer (TLCP) blend was prepared via melt mixing. The immiscible phase morphologies, linear and nonlinear, as well as transient viscoelastic properties of the blend were studied using SEM, rheometer, and DMA. The linear dynamic viscoelastic behavior of the blend shows temperature dependence due to further evolution of the immiscible morphology and, as a result, the principle of time‐temperature superposition (TTS) is invalid. In the steady shear flow, the discrete TLCP phase is difficult to be broken up because of the high viscosity ratio of the blend systems, while is easy to be coarsened and followed by elongation, and finally, to form fibrous morphology at high TLCP content and high shear level. During this morphological evolution process, the transient stress response presents step increase and nonzero residual relaxation behavior, leading to increase of the dynamic viscoelastic responses after steady preshear. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008