聚己内酯型聚羟基氨基甲酸酯的合成

Synthesis of Poly Hydroxyurethanes Based on Poly(Caprolactone)

以聚己内酯二元醇(PCL-Diol)、丁二酸酐以及碳酸甘油酯为原料,合成了端基为五元环碳酸酯的聚己内酯功能性大单体(PCL-2GC);以PCL-2GC、己二胺及硅烷偶联剂为原料,研究了反应条件对合成线性聚羟基氨基甲酸酯(PHU)相对分子质量及其分布的影响,以及交联密度和交联方式对PHU/SiO2热力学性能的影响.结果表明:线性PHU的相对分子质量随PCL-2GC浓度和反应温度的升高而先增后减,随反应时间、胺用量的增大而降低;PHU的耐热温度相比于类似结构的传统聚氨酯提高了30～40℃,PHU/SiO2交联聚合物的结晶度及热稳定性随交联密度的增大而降低;交联聚合物中无定形SiO2的分布较为均匀.

Functionalized poly （caprolactone） diol （PCL-Diol） end capped with five-membered cyclic car- bonate （PCL-2GC） was synthesized from PCL-Diol, succinic anhydride and glycerol 1, 2-carbonate. The relative molecular mass and its distribution of linear polyhydroxyurethanes （PHU） prepared from the reac- tion of PCL-2GC with 1,6-hexanediamine decrease as the reaction time and the dosage of amine increase, while first increase with increasing PCL-2GC concentration and reaction temperature and then decrease. The heat-resistance temperature of PHU is 30 40 ℃ higher than traditional polyurethane with analogous structure. The crystallization and thermal stability of crosslinked PHU/SiO2 polymers decrease with the increase of crosslink density. The amorphous SiO2 is homodispersed in the matrix of PHU/SiO2 polymers characterized from X-ray diffraction （XRD） and scanning electron microscope （SEM）.