Non-isothermal crystallization process of polyoxymethylene studied by two-dimensional correlation infrared spectroscopy
Non-isothermal crystallization process of polyoxymethylene studied by two-dimensional correlation infrared spectroscopy
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二维相关红外光谱研究聚甲醛非等温结晶过程
DOI：
10.1016/j.polymer.2011.03.007
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发表时间：
2011-04-19
期刊：
影响因子：
4.6
通讯作者：
Zhang, Aiming
中科院分区：
文献类型：
--
作者：
Li, Yunyong;Zhou, Tao;Zhang, Aiming
用二维相关红外光谱法研究了聚甲醛（POM）熔体的非等温结晶过程。在熔融结晶过程中发现了FCC（1135 cm（-1））和ECC（904 cm（-1））的混合结构，并利用DSC曲线研究了POM的非等温结晶动力学。采用一种新的微扰相关移动窗口二维（PCMW 2D）技术研究了复杂的结晶过程。我们确定了结晶的三个过程。第一个阶段是熔体中晶核生长或某些局部有序结构形成的初始阶段。由此推断，FCC的晶核形成时间早于ECC。二是POM的最高结晶温度。最后是晶体的进一步改进（特别是ECC）和低分子量环状POM的结晶。然而，FCC的这个过程比ECC慢。还使用PCMW 2D分析了再加热时的温度依赖性IR光谱。(C)2011爱思唯尔有限公司保留所有权利。
Non-isothermal crystallization process of polyoxymethylene (POM) from the melts was studied by two-dimensional correlation infrared spectroscopy. A hybrid structure of FCC (1135 cm(-1)) and ECC (904 cm(-1)) during the crystallization from the molten state was found. Non-isothermal kinetics of POM crystallization was also investigated using DSC curves. A newly perturbation-correlation moving-window two-dimensional (PCMW2D) technique was used to explore the complex crystallization process. We determined three processes in crystallization. The first is the initial stage of the crystal nucleus growing or the formation of certain local ordered structures in the melts. It can be inferred the formation of the crystal nucleus of FCC is earlier than that of the ECC. The second is the maximum crystallization temperature of POM. The last is the further improvements of crystals (especially in ECC) and the crystallization of the cyclic POM of low molecular weight. However, this process of FCC is slower than ECC. The temperature-dependent IR spectra at reheating were also analyzed using PCMW2D. (C) 2011 Elsevier Ltd. All rights reserved.