全对位聚芳醚砜醚酮酮的结晶行为研究

STUDY ON CRYSTALLIZATION BEHAVIOR OF ALL PARA-POLY(ARYL ETHER SULFONE ETHER KETONE KETONE)

以AlCl3/DCE/DMF为溶剂体系,采用低温溶液缩聚合成全对位聚醚砜醚酮酮(p-PESEKK)树脂,研究了端基、分子量及溶剂体系对树脂的溶剂诱导结晶行为的影响.结果表明,在AlCl3/DCE/DMF的良溶剂中制得的p-PESEKK为低结晶度聚合物,由于分子链中四面体结构砜基的影响,树脂熔融后很难再结晶;随脂肪链端基碳原子数的增加,溶剂诱导结晶速度逐渐下降,结晶度降低,与主链结构相同的端基更有利于结晶的形成;高分子量的p-PESEKK端基的比例相对较小,有利于溶剂诱导结晶.

Para-poly（aryl ether sulfone ether ketone ketones） （p-PESEKKs）, were prepared by low temperature solution polyeondensation of 4,4＇-his （phenoxy） diphenyl sulfone （DPODPS） and terephthaloyl chloride （ TPC ） in AlCl3/DCE/DMF solvent system. The effects of some factors on solvent induced crystallization behavior of pPESEKKs were investigated and compared. The results showed that p-PESEKKs of low crystallinity were obtained in the AlCl3/DCE/DMF good solvent system, and they became amorphous after fusion because of the influence of tetrahedral cofiguration of sulfuryl. It was found that the solvent induced crystallization rate and degree of crystallinity decreased with increasing the carbon number of ester end groups, and the end groups with the same structure as the main chain were favorable for crystallization. The high molecular weight p-PESEKKs with lower proportion of end groups were easy to be crystallized by solvent inducement.