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首页> 外文期刊>Journal of Applied Polymer Science >Effects of an Itaconic Acid Comonomer on the Structural Evolution and Thermal Behaviors of Polyacrylonitrile Used for Polyacrylonitrile-Based Carbon Fibers
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Effects of an Itaconic Acid Comonomer on the Structural Evolution and Thermal Behaviors of Polyacrylonitrile Used for Polyacrylonitrile-Based Carbon Fibers

机译：衣康酸共聚单体对聚丙烯腈基碳纤维聚丙烯腈的结构演变和热行为的影响

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摘要

The influence of an acid comonomer on the structural evolution and thermal behaviors of a polyacrylonitrile (PAN) terpolymer containing about 4.19 wt % methyl methacrylate and 0.98 wt % itaconic acid (IA) during a heating treatment were studied by Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), and thermogravimetry (TG) and compared with the PAN homopolymer. From the results of FTIR spectroscopy and DSC, we found that the presence of the IA comonomer promoted cyclization reactions at a faster rate and broadened the exothermic peak; this eased the concentration of heat release. By comparing the results of the TG data, we found that the presence of the IA comonomer promoted dehydrogenation reactions and the formation of a large quantity of better ladder structures. In additional, the better ladder structures that formed were easier to convert from ladder structures into graphitelike structures. The activation energy of random scissions at about 300 ℃ was calculated by the Kissinger method. The results show that the presence of the IA comonomer inhibited the random scission reactions to some extent.
机译：通过傅里叶变换红外（FTIR）光谱研究了酸共聚单体对包含约4.19 wt％甲基丙烯酸甲酯和0.98 wt％衣康酸（IA）的聚丙烯腈（PAN）三元共聚物在热处理过程中的结构演变和热行为的影响，差示扫描量热法（DSC）和热重法（TG），并与PAN均聚物进行比较。从FTIR光谱和DSC的结果，我们发现IA共聚单体的存在以更快的速率促进环化反应并放宽了放热峰。这减轻了放热的集中。通过比较TG数据的结果，我们发现IA共聚单体的存在促进了脱氢反应并形成了大量更好的梯形结构。另外，形成的更好的梯形结构更容易从梯形结构转换成石墨状结构。用基辛格方法计算了约300℃下随机剪切的活化能。结果表明IA共聚单体的存在在一定程度上抑制了随机分裂反应。

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