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Shear-induced crystallization and rheological behavior of syndiotactic polystyrene

Published online by Cambridge University Press:  21 February 2012

Yunfeng Zhao ,
Go Matsuba  and
Hiroshi Ito
Yunfeng Zhao
Affiliation:
Department of Polymer Science and Engineering, Yamagata University, Yamagata 992-8510, Japan
Go Matsuba*
Affiliation:
Department of Polymer Science and Engineering, Yamagata University, Yamagata 992-8510, Japan
Hiroshi Ito
Affiliation:
Department of Polymer Science and Engineering, Yamagata University, Yamagata 992-8510, Japan
*
a)Address all correspondence to this author. e-mail: gmatsuba@yz.yamagata-u.ac.jp
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Abstract

We studied the correlation between shear-induced crystallization and rheological behavior of syndiotactic polystyrene. It was found that after applying a steady shear flow around the nominal melting temperature (Tm = 270 °C), crystal growth rate was accelerated compared with the quiescent state and a morphology of oriented lamellae (kebabs) was observed. On the other hand, no obvious morphological change was observed when applying a shear flow with relatively slow shear rate. We discussed a possibility that the difference of crystal growth rate and morphology could be attributed to the competition between shear rate and relaxation time such as reptation time. Our rheological results suggested that when the imposed shear rate is close to the reciprocal of reptation time, oriented lamellae (kebabs) are observed but extended-chain crystals (shishs) cannot be formed since the chain segments between adjacent entanglements remain unstretched.

Keywords

Crystal growthMorphologyKinetics
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 10: Focus Issue: Crystallization Processes in Polymer-Based Materials , 28 May 2012 , pp. 1372 - 1378
Copyright
Copyright © Materials Research Society 2012

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