摘要
采用了聚碳酸 1,4 -丁二醇酯 ( PBC)、聚碳酸 1,6-己二醇酯 ( PHC)和聚碳酸 1,5 -戊二醇 - 1,6-己二醇酯 ( PHPC,其中己二醇链节与戊二醇链节之比为 3∶ 2 )软段 ,4 ,4′-二苯基甲烷二异氰酸酯 / 1,4 -丁二醇 ( MDI/ BDO)为硬段 (其质量含量为 4 0 % )合成出了一系列的聚碳酸酯聚氨酯 ( PCU)弹性体。其拉伸强度约为 4 0 MPa～ 60 MPa,断裂伸长率为 30 0 %～ 4 0 0 %。研究了软段结构、软段分子量对 PCU力学性能、微相分离结构的影响。结果表明 ,软段分子量越大 ,微相分离程度越大。软段为 PHPC的聚氨酯回弹性能明显优于软段为 PBC和 PHC的聚氨酯。
In the present work, three kinds of polycarbonate urethanes (PCUs) having 40%(mass%) MDI/BDO hard segments were synthesized from poly (tetramethylene carbonate) diol(PBC), poly(hexamethylene carbonate) diol(PHC) and poly(hexamethylene-co-pentamethylene carbonate) diol (PHPC,the molar ratio of hexamethylene and pentamethylene units are 3∶2),respectively, by bulk one-shot method. All PCUs have two Tgs indicated by DSC. IR and DSC revealed that the degree of microphase separation increased with the molecular weights of soft segments. The PCUs showed high tensile strength (about 40 MPa^60 Mpa)and good elasticity (300%~450% elongation at break).Particularly, The PCUs based on PHPC exhibited improved flexibility and elastic recovery as compared to those from homopolycarbonatediols, PBC and PHC due to the random structure of PHPC and less effect of crystallization than PBC and PHC during elongation.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2002年第6期37-40,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目 (5 9973 0 13 )
