Confined crystallization kinetics and scale of semicrystalline block copolymer via non-isothermal method

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• 作者：Shuangjun Chen ; Limin Wang
• 关键词：Poly(styrene) ; b ; poly(ethylene oxide) ; b ; poly(styrene) block copolymer ; Confined crystallization ; DSC ; Scale ; Kinetics
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：127
• 期：3
• 页码：2341-2351
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
• 出版者：Springer Netherlands
• ISSN：1588-2926
• 卷排序：127

文摘

In this paper, differential scanning calorimetry (DSC) was used to study non-isothermal crystallization behaviors of tri-block copolymer poly(styrene)-b-poly(ethylene oxide)-b-poly(styrene) (SEOS). Homopolymer poly(ethylene oxide) (PEO) with almost the same molecular weight as PEO block was also studied comparatively under non-isothermal conditions. From final degree of crystalline X_c and given degree of polymerization N, relative degree of crystalline X_t at different kinetics stage was changed to be monomer units numbers involved in crystallization process. Based on well-recognized model of PEO crystalline structure, X_t at specific stage can be used to calculate the scales of PEO crystalline. Comparing the crystallization behaviors of SEOS with those of PEO, it is indicated that confinement from solidified PS block restricts the mobility of PEO chain to form a pre-ordered structure in initial stage and decreases its lamellae thickness of nucleus that dominates the whole crystallization process.