Surface Modification Of Attapulgite And The Application In Polypropylene

Attapulgites(ATP) have unique advantages and different characteristics for the reinforcement modification of polypropylene(PP) owing to their characteristics such large length to diameter ratio, specific surface layer structure and ingle-dimensional natural inorganic nanoparticles. It is expected to become a new generation of PP composite toughening and reinforcing the inorganic materials. The development and status of the modification of PP, the surface modification methods of ATP have been reviewed in this paper. At the same time, the research background and significance of this project were introduced. The main purpose of this work is modification of ATP filling into PP preparation with more excellent comprehensive properties of composite materials, studying the relationship between structure and properties. The main contents are as follows:The ATP-PAMAM nanoparticles were prepared by grafting of polyamidoamine(PAMAM) onto the attapulgite(ATP) particles treated with silane coupling agent. The results showed that the modified ATP particles complete crystal, part adhesion, and the surface is rough, a slight increase in diameter, PAMAM improve the ATP microstructure in a certain extent. ATP was successfully modified in the form of chemical reaction, because the surface of the ATP with macromolecular organic matter PAMAM characteristic peak. At the same time, the reaction conditions of modification ATP were optimized by amino titration method, determine the best conditions for modified ATP.ATP-PAMAM/PP composites were prepared via melt blending using ATP-PAMAM as dispersion phase and PP-g-MAH as compatibilizer. The results showed that the mechanical properties of ATP-PAMAM/PP composites were much higher than those of PP and PP/ATP nanocomposites, due to the better compatibility of ATP-PAMAM particles with PP matrix. SEM results indicate that the ATP-PAMAM particles were dispersed uniformly in the nanocomposites for the chemical action between the amino-group in ATP-PAMAM and the carboxy group in PP-g-MAH. Notable increasing in crystallization degree of PP in the PP/ATP-PAMAM composite was detracted for the heterogeneous nucleation was induced by the ATP-PAMAM particles.