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Effect of gamma ray on isothermal crystallization kinetics of syndiotactic polystyrene

Published online by Cambridge University Press:  29 October 2013

Yi-Wen Ting ,
Tinh Nguyen ,
Chen-Ti Hu ,
Chia-Chieh Chen  and
Sanboh Lee
Yi-Wen Ting
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
Tinh Nguyen
Affiliation:
Tinh Nguyen Scientific Consulting, Inc., Gaithersburg, Maryland 20878
Chen-Ti Hu*
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
Chia-Chieh Chen
Affiliation:
Institute of Nuclear Energy Research, Longtan, Taoyuan 32546, Taiwan
Sanboh Lee*
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
*
a)Address all correspondence to this author. e-mail: sblee@mx.nthu.edu.tw
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Abstract

Isothermal crystallization kinetics of gamma-irradiated syndiotactic polystyrene (sPS) has been investigated by differential scanning calorimetry. Amorphous sPS samples were irradiated in air with gamma ray at various doses from 0 to 800 kGy, at a rate of 30 kGy/h, and melt-crystallized at different temperatures and times. Kinetics parameters were determined using Avrami's model with Gaussian functions and a modified Arrhenius equation. Isothermally crystallized sPS irradiated in air with gamma ray exhibited multiple endothermic melting peaks corresponding to various crystalline forms, and the radiation dose had a strong effect on their melting enthalpies, crystallinities, and crystallization kinetic parameters. The amount of the α-crystalline form increased with increasing crystallization time and those of the β- and β′ forms had an opposite trend. Both crystallization half time and crystallization activation energy of the α form in gamma-irradiated sPS increased with increasing radiation dose.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 21 , 14 November 2013 , pp. 3053 - 3062
Copyright
Copyright © Materials Research Society 2013 

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