Viscoelastic properties of polyarylene ether nitriles/thermotropic liquid crystalline polymer blend |
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| Authors: | Defeng Wu Yisheng Zhang Lanfeng Wu Lifeng Jin Ming Zhang Weidong Zhou Changhao Yan |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Yangzhou University, Jiangsu 225002, People's Republic of China;2. Provincial Key Laboratory of Environmental Material and Engineering, Jiangsu 225002, People's Republic of China;3. Testing Center, Yangzhou University, Jiangsu 225002, People's Republic of China |
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| 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 |
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| Keywords: | polyarylene ether nitriles thermotropic liquid crystalline polymer blend viscoelastic properties |
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