Effects of α-form or β-form nuclei on polymorphic crystalline morphology of poly(butylene adipate)
Effects of α-form or β-form nuclei on polymorphic crystalline morphology of poly(butylene adipate)
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DOI：
10.1002/pi.1922
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发表时间：
2005-12-01
影响因子：
3.2
通讯作者：
Woo, EM
中科院分区：
文献类型：
--
作者：
Wu, MC;Woo, EM
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The effects of alpha-form and beta-form nuclei on polymorphic morphology of poly(butylene adipate) (PBA) upon recrystallization from the molten state up to various T-max values were examined by differential scanning calorimetry (DSC), wide-angle X-ray diffiraction (WAXD) and polarized light microscopy (PLM). In this study, PBA with complex melting and polymorphism behaviour was used as a model for examining different types and extents of residual nuclei. As the PBA initially containing the sole alpha-crystal was brought to a molten state of various T-max, the extents of trace alpha-form crystal nuclei varied and were dependent on T-max. Furthermore, it did not matter whether, initially, the PBA contained alpha- or beta-form crystals (or both) because only a single type of alpha-nuclei could be left upon treatment to the molten liquid state at T-max. Therefore, only the alpha-crystal in PBA had 'memory capacity' in the molten liquid state while the beta-crystal did not. This was so because the latter had been completely transformed into the solid state prior to being heated into a liquid. PBA crystallized before alpha-nuclei could be packed into alpha-crystal, regardless of the crystallization temperature (T-c). For recrystallization from molten PBA without any nuclei, the crystalline polymorphism was correspondingly influenced by T-c. (c) 2005 Society of Chemical Industry.