论文部分内容阅读
以分子量为2 000的聚己二酸丁二醇酯二元醇(PBA)、甲苯二异氰酸酯(TDI)、1,4-丁二醇(BDO)、马来酸酐(MA)和苯乙烯为主要原料,制备了3种可用市售活性氧化镁(Mg O)进行增稠、并制备SMC(Sheet Molding Compound)片材的聚氨酯树脂。通过FT-IR、GPC、DSC、TGA、AFM及万能测试仪对树脂的结构、片材及固化后的制品进行了表征。测试结果表明,合成路线完全可行。随硬段含量和交联密度的增加,片材熔点升高,固化后制品的耐热性能提高,微观上硬段微区由分散相转变为连续相;2~#样品由于硬段含量和交联密度较为适宜,综合力学性能最好。
Polybutylene adipate diol (PBA), toluene diisocyanate (TDI), 1,4-butanediol (BDO), maleic anhydride (MA) and styrene with the molecular weight of 2,000 Raw materials, three kinds of commercially available activated magnesia (MgO) were prepared for thickening, and a sheet of polyurethane (SMC) sheet material was prepared. The structure, sheet and cured product of the resin were characterized by FT-IR, GPC, DSC, TGA, AFM and universal tester. The test results show that the synthetic route is feasible. With the increase of hard segment content and cross-linking density, the melting point of the sheet increases, the heat resistance of the product after curing increases, and the microscopically hard segment changes from dispersed phase to continuous phase. Density is more appropriate, the best comprehensive mechanical properties.