Isothermal Crystallization of Poly(ε-caprolactone−ethylene glycol) Block Copolymers
Isothermal Crystallization of Poly(ε-caprolactone−ethylene glycol) Block Copolymers
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DOI：
10.1021/ma980226a
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发表时间：
1999-01
期刊：
影响因子：
5.5
通讯作者：
B. Bogdanov;An Vidts;E. Schacht;H. Berghmans
中科院分区：
文献类型：
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作者：
B. Bogdanov;An Vidts;E. Schacht;H. Berghmans
用DSC研究了三种不同类型的聚己内酯-乙二醇共聚物（PCL-PEG）不相容嵌段共聚物[A-B，（A）2 -B，和A-B-A]的等温结晶行为。共聚物中的PEG重量分数从18至22重量%略微变化。已确定首先结晶的PCL组分的Avrami方程的动力学参数（半结晶时间τ 0.5和总结晶速率常数z）与相应均聚物（PCL）的动力学参数相似。第二次结晶的组分（PEG嵌段）的生长延迟归因于PEG组分和固定（硬化）总共聚物结构的PCL晶相之间的相互影响。
The isothermal crystallization of three different types of poly[∈-caprolactone-co-ethylene glycol] (PCL-PEG) incompatible block copolymers [A-B, (A) 2 -B, and A-B-A] was investigated using DSC. The PEG weight fraction in the copolymers was slightly varied from 18 to 22 wt %. It was established that the kinetic parameters from the Avrami equation (the half time of crystallization, τ 0.5 , and the rate constant of overall crystallization, z) for the PCL constituent, which crystallizes first, are similar to the kinetic parameters of the corresponding homopolymer (PCL). The growth retardation of the constituent which crystallizes second (PEG block) is attributed to the mutual influence between the PEG constituent and the PCL crystal phase which fixes (hardened) the total copolymer structure.