聚丙烯腈热稳定化纤维的裂解行为  

Degradation Behavior of Thermal Stabilized Polyacrylonitrile Fibers

作　　者：雷帅[1] 张校[1] 钟珊[1] 刘正博 曹维宇[1] 徐樑华[1] LEI Shuai ZHANG Xiao ZHONG Shan LIU Zheng-bo CAO Wei-yu XU Liang-hua(Key Laboratory of Carbon Fiber and Functional Polymer （Ministry of Education）, Beijing University of Chemical Technology, Beijing 100029, China)

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《材料工程》2017年第5期59-63,共5页Journal of Materials Engineering

基　　金：国家科技支撑计划(2014BAE07B00)

摘　　要：在聚丙烯腈基碳纤维(PANCF)制备过程中会有40%~50%的质量损失,主要发生在300~800℃范围内。对PAN裂解失重行为的研究有利于理解PANCF类石墨结构的形成机理,为制备高性能碳纤维和提高碳化收率提供理论依据。通过热重分析法(TGA)模拟PAN纤维的裂解失重过程,结果表明:在空气中进行稳定化的纤维主要有两个阶段的裂解,分别受腈基的环化率和氧含量控制。环化率和氧含量通过影响裂解行为在碳纤维中形成的缺陷结构,最终影响碳纤维的致密性。环化率越高,形成的缺陷结构越少,碳纤维的致密性越好;相反氧含量越高,形成缺陷结构越多,碳纤维的致密性越差。In the temperature range of 300-800℃, 40%-50% of the mass lost during the processing of polyacrylonitrile based carbon fiber （PANCF）. Understanding the degradation behavior will be valuable in understanding the formation mechanism of pseudo-graphite structure, and providing theoretic basis for producing high performance carbon fiber and increasing the carbonization yield. The simulation of the degradation progress was carried out on the thermogravimetric analyzer （TGA）, the results show that there are two degradation steps for PAN fiber stabilized in air, and controlled by cyclization coefficient and oxygen content. The cyclization coefficient and oxygen content are effective to the density of carbon fiber by influencing the degradation behavior, which cause defects in the fiber. The higher cyclization coefficient leads to form less structural defects and higher density of the fiber; on the contrary, the higher oxygen content leads to form more structural defects and lower density of the fiber.

关 键 词：聚丙烯腈  稳定化  裂解  碳纤维  体密度 

分 类 号：TQ342.31[化学工程—化纤工业]