PPDI型聚氨酯弹性体的耐热性研究

Study on the Heat-resistance Property of Polyurethane Elastomers Based on PPDI

以对苯二异氰酸酯(PPD I)和不同的聚合物多元醇制得了PPD I型聚氨酯弹性体(PUE),并对其进行了动态力学分析(DMA),通过确定储能模量(E’)-温度(T)曲线中的拐点温度和logE’-T中的高弹态平台区的斜率,研究了PUE材料的耐热性。最终研究结果表明,MD I型PUE的耐热性能低于PPD I型PUE的耐热性能,芳香族的扩链剂能够提高PUE的耐热性能;分子结构和聚集态结构的不同,使PUE的热稳定性各不相同。

The polyurethane elastomers （PUE） based on PPDI were prepared using different kinds of polyols with low molecular weight and p-phenyl diisocyanate （ PPDI）, and the heat-resistance property of these PUE was studied by Dynamic Mechanical Analysis （DMA） through ascertaining the temperature at the inflexion of storage modulus（E＇ ）-temperature（T） curves and the slope of flat area on the log E＇ -T curves. The results indicate that the heat-resistance property of PUE based on PPDI is higher than that of PUE based on MDI. And it also was concluded that the heat-resistant property of PUE could be improved by using aromatic extending agent, and that the stability on temperature was different each other because of the distinctness PU molecular structure.