低模量聚酯型PU弹性体力学性能的研究

以聚酯二醇、甲苯二异氰酸酯(TDI)和扩链剂为原料，制备浇注型PU 弹性体，研究了预聚法和一步法、聚酯与聚醚、80/20-TDI和2，4-TDI、聚酯二醇的种类及其相对分子质量、弹性体交联点相对分子质量和硬段质量分数对弹性体力学性能的影响。结果表明，采用预聚法，以聚酯和80/20-TDI为原料合成的PU弹性体的综合性能较好。3种聚酯型PU弹性体中，聚丁二醇己二酸酯二醇的PU弹性体的综合力学性能最好。交联点相对分子质量为4 500时，PU弹性体的强度为最大值。;A cast PU elastomer was prepared with polyester glycol，toluene diisocyanate (TDI)and chain extender.The influence of prepolymerization and one-step polymerization，80/20 TDI and 2，4-TDI，type and molecular weight of polyester glycol，molecular weight between crosslinking si tes and molecular weight of rigid segment on the mechanical properties of PU elastomer was investigated.The results showed that the PU elastomer made of ployester and 80/20 TDI by prepolymerization had the better comprehensive properties.Among three polyester PU elastomers，the PU elastomer made of PBA had the best comprehensive properties.The PU elastomer had the greatest strength when the molecular weight betw een crosslinking sites was 4 500