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Title of Journal: Polym Bull

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Abbravation: Polymer Bulletin

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Springer Berlin Heidelberg

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DOI

10.1002/chin.201351226

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1436-2449

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Effects of crystallization temperature and spherul

Authors: Chaowen Zhang Lu Lu Wenqiang Li Lihua Li Changren Zhou
Publish Date: 2016/03/18
Volume: 73, Issue: 11, Pages: 2961-2972
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Abstract

The cracking behavior of spherulites in meltcrystallized poly llactic acid and poly R3hydroxybutyric acid was investigated in an isothermal crystallization process Layered spherulites with dual T c were prepared under gradient cooling conditions As T c decreased the crack density reduced obviously while width and depth of the cracks increased A comparison of the effects of crystallization temperature T c and spherulite size on cracking behavior in spherulites was present for the first time Cracks were found to be more sensitive to T c than spherulite size Cracks were healed with a thermal treatment and the process was fully reversible The crack positions were closely depended on the crystalline lamellae alignment set up at T cThis work was supported by the Natural Science Foundation of Guangdong Province No 2014A030313379 the National Natural Science Foundation of China No 81171459 and Research fund for the excellent doctoral dissertation of Guangdong Province No sybzzxm201121

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