混合溶剂法合成高分于量PAN树脂

优质PAN原丝是生产高性能碳纤维(CF)的前提,采用高分子量聚丙烯腈(PAN)共聚树脂进行干喷混纺是提高原丝性能的有效途径之一。本文采用混合溶剂法合成了分子量(Mw)为5.2×10~5～3.16×10~6的PAN共聚树脂,系统地讨论了实验条件对聚合结果的影响,并对反应机理进行了初步探讨。对合成的树脂进行热分析时发现树脂的热行为更适合预氧化反应。

SYNTHESIS OF HIGH MOLECULAR WEIGHT PAN IN MIXED SOLVENT SYSTEM

High Quality PAN precursor fiber is very important for the production of carbon fiber.It is effective to spin the high molecular weight PAN copolymer by using the dry-jet wet spinning technique for improving the quality of PAN fiber.In this paper,the synthesis and properties of PAN copolymer with average molecular weight in the range of 52×104-316×104(Mw)prepared in mixed solvent system is investigated systematically,and the polymerization mechanism is also discussed.The result of thermal analysis by DTA method indicates that the copolymer is more suitable to the preoxidation process.