Crystallization kinetics and crystalline structure of biodegradable Poly(ethylene adipate)
Crystallization kinetics and crystalline structure of biodegradable Poly(ethylene adipate)
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DOI：
10.1016/j.polymer.2009.11.065
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发表时间：
2010-02
期刊：
影响因子：
4.6
通讯作者：
Jinjun Yang;Pengju Pan;Tungalag Dong;Y. Inoue
中科院分区：
文献类型：
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作者：
Jinjun Yang;Pengju Pan;Tungalag Dong;Y. Inoue
系统研究了高、低分子量生物降解聚己二酸乙二酯（PEA）的结晶动力学、结晶形态和结晶结构。从差示扫描量热分析得到的结晶动力学表明，无论是一次结晶和二次结晶过程中发生的HMW和LMW PEA样品的等温和非等温结晶过程。在相同的结晶条件下，低分子量PEA的结晶速度比高分子量PEA快。形成环带球晶的PEA样品呈现出比没有环带球晶的样品更高的Avrami指数值（n），部分归因于不同的晶体生长机制。从广角X射线衍射和傅里叶变换红外光谱的结果，它被证实，PEA的结晶结构是不依赖于结晶温度（Tc）和MW。从结晶动力学的原位FTIR研究得出结论，在42 °C下的等温结晶过程中，酯基的结构重排先于CC主链的结构重排。
The crystallization kinetics, morphology and crystalline structure of biodegradable poly(ethylene adipate) (PEA) with high and low molecular weights (HMW, LMW) were systematically investigated. The crystallization kinetics obtained from differential scanning calorimetry analysis indicated that both the primary and secondary crystallizations occur during the isothermal and non-isothermal crystallization processes for HMW and LMW PEA samples. Under the same crystallization condition, LMW PEA was found to crystallize faster than HMW PEA. The PEA sample forming the ring-band spherulite presents a higher Avrami exponent value (n) than that without the ring-band spherulite, due in part to the different crystal growth mechanism. From the results of wide angle X-ray diffraction and Fourier transform infrared spectroscopy, it was confirmed that the crystalline structure of PEA is not dependent on the crystallization temperature (Tc) and MW. From the in-situ FTIR investigation of the crystallization kinetics, it is concluded that, during the isothermal crystallization process at 42 °C, the structural rearrangement of the ester group precedes that of the CC backbone.