摘要
分别采用相对分子质量为2000或3000的聚己二酸-1,3-丙二醇酯二醇,与4,4'-二苯基甲烷二异氰酸酯(MDI)反应制备NCO封端的预聚体,然后用1,4-丁二醇(BDO)扩链制备了聚氨酯材料(PU-PPA),并且与以聚己二酸-1,4-丁二醇酯二醇(PBA)所制备的聚氨酯材料(PU-PBA)进行性能对比。结果表明,聚酯型PU材料的吸水率较低;PU-PPA的软段结晶能力弱,储能模量低,柔顺性好,但其力学强度和耐水解性能差于PU-PBA材料;软段相对分子质量的增加能够提高PUPPA的微相分离程度,从而改善其力学性能,但耐水解性变差。此外,提高硬段含量能够同时提升PU-PPA的力学强度和耐水解性。
A series of polyester-based polyurethane materials （PU- PPA）were synthesized through poly （1,3- propylene adipate） glycol （PPA） with molecular weight 2000 or 3000 g/mol reacted with 4,4r-diphenylmethane diisocyanate （MDI） to prepare NCO-terminated PU prepolymer,and then 1,4-butanediol （BDO） used as chain extender. The PU prepared from poly （ 1,4-butanediol adipate） glycol （PBA） （PU- PBA） was used as a control sample. The results showed that, compared with PU- PBA, PU-PPA had lower storage modulus and better chain flexibility due to the weaker crystallization ability of PPA soft segments. However,mechanical strength and hydroly-sis resistance of PU-PPA were worse than those of PU- PBA. The increasing molecular weight of PPA soft segments could improve micro-phase separation and mechanical properties of PU- PPA,but the water absorption of PU-PPA was reduced. Furthermore,mechanical strength and hydrolysis resistance of PU-PPA was improved by increasing content of hard segment.
出处
《聚氨酯工业》
北大核心
2017年第2期8-11,15,共5页
Polyurethane Industry
基金
杜邦中国集团有限公司上海分公司资助
关键词
1
3-丙二醇
聚氨酯弹性体
吸水率
聚酯型聚氨酯
耐水解性能
1, 3-propylene glycol
polyurethane elastomer
water absorption
polyester polyurethane
hydrolysis resistance
