Abstract: A novel series of random copolymers composed of poly(aryl ether sulfone ether ketone ketone) were prepared by low temperature solution polycondensation of 2,2￠,6,6￠-tetramethyl-4,4￠-diphenoxydiphenylsulfone (o-M2DPODPS), diphenether (DPE) and terephthaloyl chloride(TPC) in 1,2-dichloroethane in the presence of AlCl3 and DMF. The copolymers were characterized by 1H-NMR, FT-IR, DSC, XRD, TGA, etc. The results show that glass transition temperature increases with the increasing ratio of o-M2DPODPS/DPE, the inherent viscosity, melting temperature and crystallinity of copolymers decrease with the increase of the ratio of o-M2DPODPS/DPE. The solubility of the copolymers is improved greatly, while the copolymers still exhibit excellent thermostabilities and solvent resistance. As a latent functional group, the bis(o-methyl) pendant can be converted to bromomethyl, aldehyde or carboxylic acid groups. The high-performance polymers with functional groups on the polymer main chain for specialty applications such as membrane materials can be prepared by functionalization reactions.

Key words: poly(aryl ether sulfone ether ketone ketone), bis(o-methyl) moiety, electrophilic polycondensation, properties and structure

摘要： 以2,2￠,6,6￠-四甲基-4,4￠-二苯氧基二苯砜(o-M2DPODPS)、二苯醚(DPE)和对苯二甲酰氯(TPC)为单体，在无水AlCl3和N,N-二甲基甲酰胺(DMF)存在的条件下，于1,2-二氯乙烷(DCE)中进行低温溶液无规共缩聚，合成了一系列新型线型高分子量含双邻甲基取代结构的聚醚砜醚酮酮(DM-PESEKK)/聚醚酮酮(PEKK)无规共聚物，并用IR, DSC, XRD, TGA和1H-NMR等方法对共聚物进行了表征分析，考察了共聚物的溶解性能. 结果表明，随着DM-PESEKK含量的增加，玻璃化转变温度(Tg)逐渐升高，熔融温度(Tm)逐渐降低，结晶度下降，溶解性得到明显改善.

关键词: 聚醚砜醚酮酮, 双邻位甲基侧基, 共聚, 结构与性能