聚硫聚氨酯的合成及其热力学性能

Synthesis and Thermodynamics Properties of Polysulfide Based Polyurethane

摘要: 以聚硫橡胶（PS）、聚四氢呋喃（PTMG）、二苯基甲烷二异氰酸酯（DPMDI）为原料，制备聚硫聚氨酯（PS/PU）复合材料。研究了G4、G112、G21C不同型号聚硫橡胶及其质量分数对聚硫聚氨酯复合材料结构和热力学性能的影响，进行了红外分析、差示扫描热分析（DSC），通过TGA确立了热降解活化能。结果表明：G4和G21C型聚硫橡胶改性的聚氨酯具有更好的热稳定性能，其降解活化能可达171.36 kJ/mol。

Abstract: Polysulfide based polyurethane was synthesized from polysulfide(PS) with different molecular weight and thiol contents, diphenylmethane diisocyanate(DPMDI) and polytetramethylene glycol(PTMG). The structure, thermodynamics properties and degradation activation energy of polysulfide based polyurethane were characterized by FT IR, DSC and TGA. Polyurethanes modified by G4 and G21C polysulfides had better thermodynamics stability compared to those unmodified and the degradation activation energy was increased to 171.36 kJ/mol.