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通过1,4-环己基二甲醇和碳酸二苯酯的绿色酯交换法工艺合成了聚1,4-环己基二甲基碳酸酯二醇(PCHDL)。采用两步法先后与4,4-二环己基甲烷二异氰酸酯(H12MDI)和1,4-丁二醇(BDO)反应,制备出聚1,4-环己基二甲基碳酸酯聚氨酯(PCHDPU),并研究了软段分子量、硬段含量对聚氨酯性能的影响。研究结果表明,利用酯交换法,成功合成了不同分子量的PCHDL,并且发现其玻璃化转变温度Tg随分子量的增大而增加。对PCHDPU的热重分析研究表明其起始热分解温度可达到290℃以上,具有良好的热稳定性;探讨了软段分子量,硬段含量对所得聚氨酯力学性能的影响。
Polycyclic 1,4-cyclohexanedimethyl carbonate diol (PCHDL) was synthesized by a green transesterification process of 1,4-cyclohexanedimethanol and diphenyl carbonate. Polycyclic 1,4-cyclohexanedimethylcarbonate polyurethane (PCHDPU) was prepared by a two-step reaction with 4,4-dicyclohexylmethane diisocyanate (H12MDI) and 1,4-butanediol (BDO) The effects of soft segment molecular weight and hard segment content on the properties of polyurethane were also studied. The results show that PCHDL with different molecular weights has been successfully synthesized by transesterification, and the glass transition temperature (Tg) increases with the increase of molecular weight. The thermogravimetric analysis of PCHDPU shows that the initial thermal decomposition temperature of PCHDPU can reach over 290 ℃ and has good thermal stability. The influence of the soft segment molecular weight and the hard segment content on the mechanical properties of the obtained polyurethane is discussed.