Study On The Toughening And Reinforcing Of Polyproylene By Elastomer And Nano-inorganic Particle

To study on the toughening and reinforcing polypropylene by elastomer/nano-inorganic particle, PP/POE blends and PP/POE/nano-SiO2composites were first prepared by melt-blending method. Nano-SiO2was grafted by MMA and BA, and PP was grafted by GMA, to prepare PP/POE/modified nano-SiO2and PP/POE/NH2-SiO2/PP-g-GMA. The mechanical properties, thermal properties, crystalline properties, processing properties, microstructure and dynamic mechanical properties of the composites were studied. The excellent performance of the composites was investigated. The research results were as follows:In the process of POE toughening PP, increasing the dosage of POE could significantly improve the toughness of the PP, but to reduce the strength of PP;In the process of studying the PP/POE/nano-SiO2composites, nano-SiO2played the role of reinforcement, but due to the poor compatibility of nano-SiO2with PP, so the effect was not obvious;Synergy effect between modifiednano-SiO2and POE could toughen and strengthen PP. In the PP/POE/SiO2-g-PMMA composite by adding two copies of SiO2-g-PMMA, the impact strength was39.3KJ/m2,589.5%higher than pure PP,41.4%higer than PP/POE(80/20) blend. In PP/POE/SiO2-g-PBA composite system, when adding two copies of SiO2-g-PBA the impact strength was60KJ/m2, increased by952.6%compared to PP;115.8%higher than PP/POE (80/20) blend, flexural strength increased by16.1%. Adding modified nano-silica, the spherulite size of PP decreased, the grain boundary was fuzzy. Moreover improving the mechanical properties of PP and its processing performance was obviously improved, which playing the role of toughening and strengthening of PP.PP/POE/NH2-SiO2/PP-g-GMA composites were prepared by reactive compatibiliza-tion. The result has shown that the method of reactive compatibilization not only improved the compatibility of PP matrix and nano-SiO2, but also improved the properties of the material, when the ratio of PP/POE/NH2-SiO2/PP-g-GMA was70/10/2/20, flexural strength was53.24MPa, compared to the PP/POE (80/20) increased by33.6%, Impact strength52.9KJ/m2than that of PP increased by828.1%,90.0%than PP/POE (80/20) blend. Processing flow of composites became better and the size of crystallization became smaller. In addition, the thermal performance was significantly improved and overall properties were optimal.