低分子量端羧基氟弹性体的端基分析  

End group analysis of low molecular weight carboxyl terminated fluoroelastomer

作　　者：蒲倩 王豪[1] 张天福 刘振超 张孝阿[1] 王成忠[1] 李伟[2] 江盛玲[1] Pu Qian;Wang Hao;Zhang Tianfu;Liu Zhenchao;Zhang Xiaoa;Wang Chengzhong;Li Wei;Jiang Shengling(Key Laboratory of Carbon Fiber and Functional Polymers of Ministry of Education,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Science and Technology on Aerospace Chemical Power Laboratory,Hubei Institute of Aerospace Chemotechnology,Xiangyang 441003,Hubei,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,材料科学与工程学院,北京100029 [2]航天化学动力技术重点实验室,湖北航天化学技术研究所,湖北襄阳441003

出　　处：《中国胶粘剂》2022年第1期1-5,10,共6页China Adhesives

基　　金：国家自然科学基金资助项目(21975066);航天化学动力技术重点实验室开放基金资助项目(STACPL120201B07);山东省重点研发计划项目(重大科技创新工程)。

摘　　要：以低分子量固体氟弹性体为初始原料,研究了KOH和双氧水用量对所得低分子量端羧基氟弹性体分子量及其分布的影响。进一步以电位滴定测得的羧基含量和化学计量等当点的pH为基础,对多种酸碱指示剂进行优选。研究结果表明:以溴甲酚紫为指示剂时滴定结果与电位滴定最接近,且终点颜色变化明显,更易于判定。最后,结合产物数均分子量和端羧基含量计算其平均官能度,并讨论了影响官能度大小的主要因素。Low molecular weight solid fluoroelastomers were used as initial materials,and the effects of the amount of KOH and hydrogen peroxide on the molecular weight and distribution of low molecular weight carboxyl terminated fluoroelastomer were studied. Furthermore,based on the carboxyl content measured by potentiometric titration and the pH at the stoichiometric equivalence point,a variety of acid-base indicators were optimized. The research results showed that the titration results were the closest to the potentiometric titration when bromocresol purple was used as the indicator. And the color change of end point was obvious,which was easier to judge. Finally,the average functionality was calculated by combining the number average molecular weight of the product and the content of terminal carboxyl groups,and the main factors affecting the functionality were discussed.

关 键 词：低分子量氟弹性体 羧基含量 酸碱滴定 电位滴定 

分 类 号：TQ430[化学工程]