接枝和交联对纳米SiO_2改性NR/PP共混型热塑弹性体的影响

EFFECT OF GRAFTING AND CROSSLINKING ON NANO-SILICA MODIFIED NR/PP BLENDED THERMOPLASTIC ELASTOMER

动态硫化制备纳米二氧化硅(SiO2)改性天然橡胶/聚丙烯共混型热塑性弹性体(NR/PP TPE).研究了马来酸酐/苯乙烯/过氧化二异丙苯(MAH/St/DCP)多单体“就地”熔融接枝、交联对TPE力学性能、耐溶剂性能和耐热变形性能的影响,并用SEM分析了TPE的断面形貌.结果表明:纳米SiO2和MAH/St/DCP的最佳质量分数分别为0.03和0.0375/0.0188/0.00375时,MAH/St/DCP接枝、交联改性NR/PP/纳米SiO2TPE的力学性能、耐溶剂性能和耐热变形性能最佳.MAH/St/DCP“就地”接枝、交联通过细化交联NR分散相、改善交联NR分散的均匀性和增加两相之间的共交联,使NR与PP两相界面结合强度明显提高,NR/PP TPE的综合性能得到明显的改善.

Dynamic vulcanized NR/PP/nano-silica blended thermoplastic elastomer （TPE） was prepared. The effects of the modification of nano-silica and MAH/St/DCP multi-monomer melt grafting and cross-linking on the mechanical properties, the resistance to solvent and resistance to thermal distortion of TPE were investigated. SEM was used to study the morphology structure of TPE. The results showed that, the MAH/St/DCP multi-monomer melt grafted and cross-linked TPE had the best mechanical properties, resistance to solvent and resistance to thermal distortion, when the mass ratio of nano-silica was 0.03 and that of MAH/St/DCP was 0.0375/0.0188/0.00375. The compatibility and interracial interaction between NR and PP were increased greatly by thinning the dispersive phase, improving the dispersion uniformity of NR and enhancing the co-cross-linking of the two phases. The comprehensive properties of NR/PP TPE were improved obviously.