【摘要】 采用DMA法研究了热力学、动力学因素及组成比对聚氨酯/乙烯基酯树脂互穿聚合物网络(PU/VER IPN)材料阻尼性能的影响。研究发现:引入丙烯酸酯类单体为VER共聚单体,改善了常规以苯乙烯(St)为共聚单体的PU/VER(St)IPN材料的阻尼性能,含较长酯基的体系具有更优的阻尼性能;通过调整两网络的相对聚合速率及组成比,可使材料出现宽温域阻尼,合成的组成比为80/20、70/30及60/40的IPN材料,在至少近80℃的温域,阻尼因子(tanδ)>0.3。进一步通过TEM检测分析了IPN材料微观结构与阻尼性能的关系。更多还原

【Abstract】 The influence of thermodynamic, dynamic factors and component ratios on damping properties of PU/VER IPN materials was studied by dynamic mechanical analysis (DMA) . It is found that the damping properties of general PU/VER (St) IPN materials (polystyrene is VER’s comonomer) are improved by introducing acrylic esters as VER’s comonomers and the IPN material with long ester groups has excellent damping properties; the IPN materials with the broad transition range can be prepared by adjusting the relative polymerization rate and component ratios. When the component ratios are 80/20, 70/30 and 60/40, tanδ values are higher than 0. 3 for a temperature range of at least near 80℃. The relation between microstructure and damping properties of IPN materials was further studied by TEM.更多还原