摘要： 以L-赖氨酸二异氰酸酯为硬段,聚ε-己内酯二元醇(PCL)为软段采用两步法合成了无毒、可生物降解型水性聚氨酯,研究了R值、扩链剂用量以及预聚温度对乳液及涂膜性能的影响。结果表明,当R值为1.5、扩链剂1,4-丁二醇用量为4%、预聚温度为80℃时所合成的水性聚氨酯乳液性能最优。力学性能测试表明其具有良好的机械性能,拉伸强度可达46.5 MPa;80 d后水解降解质量损失达42%,说明所制备的聚氨酯具有可降解性,是一种具有广泛应用前景的生物医用材料。

关键词: 生物降解, 水性聚氨酯, 合成, 性能

Abstract: Taking L-lysine diisocyanate as hard segment, polycaprolactone glycol (PCL) as soft segment, a non-toxic and biodegradable aqueous polyurethane was prepared using a two step process.The influence of R value, amount of chain extended 1, 4-butylene glycol and prepolymerization temperature on the properties of waterborne polyurethane emulsion and the film were studied. It is showed that when the Rvalue was 1. 5, the amount of BDO 4% and the reaction temperature 80 ℃, the product prepared was best.The mechanical property tests showed good mechanical properties, tensile strength up to 46.5 MPa and the mass loss of hydrolytic degradation after 80 days was 42%. The polyurethane prepared have biodegradability, which showed a good prospects as a biological medical material.

Key words: biodegradation, waterborne polyurethane, synthesis, property