聚酰亚胺纤维热亚胺化过程研究  

Study on Thermal Imidization Process of Polyimide Fiber

作　　者：陈雪[1] 崔晶[1] 孙旭阳 刘京妮 林程 CHEN Xue;CUI Jing;SUN Xuyang;LIU Jingni;LIN Cheng(Shanghai Research Institute of Petrochemical Technology,SINOPEC,Shanghai 201208,China)

机构地区：[1]中国石油化工股份有限公司上海石油化工研究院,上海201208

出　　处：《化学反应工程与工艺》2022年第4期338-347,共10页Chemical Reaction Engineering and Technology

摘　　要：为考察柔性、刚性和半刚性三种不同结构聚酰亚胺(PI)的热亚胺化过程,通过差式扫描量热(DSC)测试,得到三种PI的前驱体聚酰胺酸(PAA)在不同升温速率下亚胺化反应的热过程,根据Kissinger法和Flynn-Wall-Ozawa法计算得到不同结构PI的亚胺化反应动力学方程。经过原位升温红外光谱判断出在亚胺化反应过程中柔性结构PI-1几乎没有解离反应,刚性结构PI-2和半刚性结构PI-3在亚胺化过程中伴随酐的产生,其解离过程占优势的温度为150~300℃。结果表明:半刚性结构PI-3亚胺化反应活化能较低,亚胺化过程中力学性能较好,产生酐的解离过程比较缓和,是制备高性能PI纤维较为理想的聚合体系。In order to investigate the thermal imidization process of different polymerization systems,the peak temperatures of imidization reaction of three polyimide(PI)systems at different heating rates were obtained by differential scanning calorimetry(DSC)test.The activation energy,pre exponential factor and reaction kinetics equation of different PI were calculated by Kissinger method and Flynn-Wall-Ozawa method.The relationship among the reaction rate,reaction temperature and conversion rate was studied.The flexible structure PI-1 had almost no dissociation reaction,the rigid structure PI-2 and semi-rigid structure PI-3 were accompanied by the production of anhydride in the imidization process.At the same time,the temperature range of the dissociation reaction was determined to be 150-300℃by in-situ temperature rising infrared spectroscopy.Combined with the coupling effect of kinetics and thermodynamics,the results illustrated that the process of imidization of PI with flexible and rigid copolymer structure occur relatively gently,which was an ideal polymerization system for the preparation of high strength and high modulus PI fiber.This work has important reference significance for improving the mechanical properties of PI fibers by adjusting the preparation conditions.

关 键 词：聚酰胺酸 热亚胺化 动力学 解离反应 

分 类 号：TQ342.73[化学工程—化纤工业]