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首页> 外文期刊>Journal of Applied Polymer Science >Effect of molecular weight on spherulitic growth rate of poly(epsilon-caprolactone) and poly(epsilon-caprolactone)-b-poly(ethylene glycol)
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Effect of molecular weight on spherulitic growth rate of poly(epsilon-caprolactone) and poly(epsilon-caprolactone)-b-poly(ethylene glycol)

机译：分子量对聚ε-己内酯和聚ε-己内酯-b-聚乙二醇球状生长速率的影响

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摘要

The spherulitic growth rates of a series poly (epsilon-caprolactone) homopolymers and poly(epsilon-caprolactone)-b-poly(ethylene glycol) (PCL-b-PEG) block copolymers with different molecular weights but narrow polydispersity were studied. The results show that for both PCL homopolymers and PCL-b-PEG block copolymers, the spherulitic growth rate first increases with molecular weight and reaches a maximum, then decreases as molecular weight increases. Crystallization temperature has greater influence on the spherulitic growth rate of polymers with higher molecular weight. Hoffman-Lauritzen theory was used to analyze spherulitic growth kinetics and the free energy of the folding surface (sigma(e)) was derived. It is found that the values of sigma(e) decrease with molecular weight at low molecular weight level and become constant for high molecular weight polymers. The chemically linked PEG block does not change the values of sigma(e) significantly. (c) 2007 Wiley Periodicals, Inc.
机译：研究了一系列不同分子量但窄分散性的聚（ε-己内酯）均聚物和聚（ε-己内酯）-b-聚乙二醇（PCL-b-PEG）嵌段共聚物的球形增长速率。结果表明，对于PCL均聚物和PCL-b-PEG嵌段共聚物，球状增长速率均随分子量的增加而增加，并达到最大值，然后随分子量的增加而降低。结晶温度对具有较高分子量的聚合物的球状生长速率具有更大的影响。使用霍夫曼-劳里森理论来分析球晶的生长动力学，并得出折叠表面的自由能（sigma（e））。发现在低分子量水平下，σ（e）的值随分子量降低，而对于高分子量聚合物而言，sigma（e）的值变得恒定。化学连接的PEG嵌段不会显着改变sigma（e）的值。 （c）2007年Wiley Periodicals，Inc.

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