The thermal stabilization of polyacrylonitrile fibers (FPAN) is one of the most important steps in the production of carbon fibers (CFs). In this paper, new precursor polymers from PAN have been synthesized with different chemical characteristics using a solution polymerization, and FPAN was obtained using an unconventional wet spinning system in the drying and collapsing steps. The effect of different operation conditions, comonomers, and termonomers on the properties of precursor polymers, polymerization reactions, mechanical properties, structural characteristics, and stabilization of the FPAN was studied and analyzed. FTIR and optical microscopy were used to analyze structural changes of FPAN in the thermal stabilization. The impact of the chemical composition of the precursor polymers on the physicochemical characteristics of FPAN and their behavior in the thermal stabilization process were evaluated. In particular, itaconic acid termonomer improved the tensile strength of the fibers from 8.07 to 16.87 cN/dtex, and the extent stabilization increased from 1.81 to 4.6. FTIR indicated that the reaction of stabilization of the terpolymer developed was initiated at a lower temperature compared to that of a commercial precursor polymer.

中文翻译：

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用于PAN碳纤维前驱物的三元聚合体系分析。

聚丙烯腈纤维（FPAN）的热稳定是碳纤维（CFs）生产中最重要的步骤之一。在本文中，使用溶液聚合法合成了具有不同化学特性的PAN新型前驱体聚合物，在干燥和折叠步骤中使用非常规湿纺系统获得了FPAN。研究和分析了不同的操作条件，共聚单体和三聚单体对前体聚合物性能，聚合反应，机械性能，结构特性和FPAN稳定性的影响。FTIR和光学显微镜用于分析热稳定中FPAN的结构变化。评估了前体聚合物的化学组成对FPAN的理化特性的影响及其在热稳定过程中的行为。特别地，衣康酸三聚单体将纤维的拉伸强度从8.07提高到16.87 cN / dtex，并且程度稳定性从1.81提高到4.6。FTIR表明，与市售前体聚合物相比，所形成的三元共聚物的稳定化反应在较低的温度下引发。