Research On Preparation And Properties Of Plasticized And Toughened Polypropylene

Polypropylene(PP) is one of the top five general-purpose plastic with good integrated performance. Because of it's low impact strength, the application area of PP is restricted to some extent. If the impact strength of PP could be improved by modification, it is possible to expand the range of application.In this paper, liquid paraffin(LP) was used as the plasticizer for random copolymerized polypropylene(PP-R) and homo-polypropylene(PP-H). Firstly, inorganic nanoparticles were pre-dispersed in LP to produce the nano-sol. Then plasticized and toughened PP-R and PP-H were prepared via melt blending of the nano-sol with PP-R and PP-H through a twin-screw extruder. The effect of LP and inorganic nanoparticles on mechanical properties and crystallization behavior of PP-R and PP-H were investigated. On the above basis, plasticized and toughened PP-H was melt blent with bamboo fiber to prepare bamboo fiber/polypropylene composite. Then influence of the amount of compatibilizer, the category and amount of bamboo fiber, the amount of LP and nano-SiO2 on properties of bamboo fiber/polypropylene composite was researched.The experiment results showed that LP could improve the impact strength of PP-R and PP-H. Inorganic nanoparticles could enhance the impact strength of plasticized PP-R and plasticized PP-H further, and nano-SiO2 exerted the best toughening effect among the three kinds of nanoparticles. PP-g-MAH could improve the compatibility between bamboo fiber and PP-H, therefore bamboo fiber/polypropylene composite, which was produced through melt blending of bamboo fiber with plasticized and toughened PP-H, possessed good flexural property, heat resistance property, melt processability and corrosion resistance.