Effects of crystallization temperature and blend r

Authors: Haijun Wang Huiping Feng Xuechuan Wang Peiying Guo Tingshan Zhao Longfang Ren Xihuai Qiang Yuhao Xiang Chao Yan

Publish Date: 2014/03/01

Volume: 32, Issue: 4, Pages: 488-496

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Abstract

The effects of crystallization temperature and blend ratio on the polymorphic crystal structures of polybutylene adipate PBA in polybutylene succinate PBS/polybutylene adipate PBS/PBA blends were studied by means of differential scanning calorimetry DSC wideangle Xray diffraction XRD and atomic force microscopy AFM It was revealed that the polymorphism of PBA can be regulated by the blend ratio even in a nonisothermal crystallization process The results demonstrate that high temperature favors flaton α crystals while low temperature contributes to edgeon β crystals It was also found that the effect of blend ratio on the crystallization mechanism of PBA is well coincident with that of the crystallization temperature The increment of PBS content in the PBS/PBA blend gives rise to more βform crystals of PBA For those PBS/PBA blends with low PBA content the interlamellar phase segregation of PBA makes its molecular chains so difficult to diffuse from one isolated microdomain to another that high crystallization temperature and sufficiently long crystallization time will be required if the PBA αtype crystals are targetedThis work was financially supported by the National Natural Science Foundation of China Nos 21204045 and 21276151 Natural Science Basic Research Plan in Shaanxi Province of China No 2011JQ2004 and Key Scientific Research Group of Shaanxi Province No 2013KCT08

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