二苯醚-对苯二甲酰氯-4,4'-二苯氧基二苯砜三元共聚物的合成与性能

Synthesis and Properties of PEKK/PESEKK Copolymers

以无水ＡｌＣｌ３／ＣｌＣＨ２ＣＨ２Ｃｌ／ＮＭＰ为催化剂／溶剂体系，通过缩聚反应，由二苯醚，对苯二甲酰氯和４，４－二苯氧基二苯砜合成了聚醚酮酮和聚醚砜醚酮酮共聚物（ＰＥＫＫ／ＰＥＳＥＫＫ）．考察了单体浓度、反应时间对聚合物分子量的影响，并对其进行了ＩＲ、ＤＳＣ、ＷＡＸＤ等分析表征．结果表明，共聚物具有优异的耐热性，随着共聚物中ＰＥＳＥＫＫ单元含量的增加，其玻璃化温度逐渐升高，而熔融温度和结晶度逐渐降低．与聚醚酮酮（ＰＥＫＫ）相比，共聚物的断裂伸长率明显提高，而拉伸强度和拉伸模量却有所下降，但仍具有良好的力学性能．

PEKK/PESEKK copolymers of high molecular weight have been synthesized by solution polycondensation of diphenyl ether, terephthaloyl chloride and 4,4 diphenyoxydiphenyl sulfone in a catalyst/solvent system of AlCl 3/ClCH 2CH 2Cl/NMP. The effects of monomer molarity and reaction time on copolymer molecular weight are studied. The copolymers have been characterized by IR, DSC and WAXD. The results indicate that the copolymers exhibit excellent heat resistance. Raising PESEKK content in the copolymer increases the T g of the copolymer, but decreases its T m and crystallinity. The elongation at break of the copolymer is much higher than that of PEKK, but the tensile modulus and tensile strength are lower than those of PEKK.