PCDL含量对混和软段的PUE相分离和阻尼性能的影响

Effect of Polycarbonate Content on the Phase Separation and Damping Properties of PUE Based on Mixed Segments

以甲苯二异氰酸酯(TDI)、1,4-丁二醇(BDO)为硬段,聚碳酸酯二醇(PCDL)和聚醚二醇(PPG)混合物为软段,采用预聚体法制备了不同软段组成的聚氨酯弹性体(PUE)。采用DSC、FT-IR和DMA等分析手段研究了PCDL含量对PUE的微相分离程度和阻尼性能的影响。结果表明,随着软段中PCDL含量的增加,PUE中氨酯羰基的氢键化程度减小,相分离程度减小,而且PUE的储能模量随着PCDL含量的增加而减小;与单一组分软段的PUE相比较,混合软段的PUE具有相对较好的阻尼性能。

Polyurethane elastomers were synthesized using Toluene Diisocyanate （TDI） and 1, 4-butanediol （BDO） as hard segments and mixed macrodiols derived from polycarbonate diol and polypropylene diol as soft segments by prepolymer method. The effect of polycarbonate content on the phase separation and damping properties of polyurethane elastomers was investigated by DSC, PT-IR and DMA. The results indicated that the PUE phase sepa- ration and the fraction of hydrogen bonded carbonyl decreased with PCDL content increasing. And then, the modulus of polyurethanes decreased. Compared with the PUE with one component soft segments, the polyurethane elastomers with mixed soft segments displayed relatively better damping properties.