Graftização de polipropileno-G-anidrido maleico sobre microesferas ocas de vidro por extrusão reativa

Abstract

Using a maleic grafted polypropylene copolymer as a compatibilizing agent on a composite with hollow glass microspheres HGM is one way to reduce the mechanical properties decrement associated to the round, hollow, hydrophilic spheres. In this work, the esterification reaction between the PP-g-MAH and hollow glass microspheres was studied, both being present in a polypropylene/hollow glass microsphere composite and have been made by reactive extrusion. The aim of this work is to quantify the yield and efficiency of this reaction and to understand the influence of temperature over these. Results show that both parameters are dependent on both the initial content of PP-g-MAH on the extruder and temperature, and that both increase with increasing the initial content, but decrease with increasing temperature, having the lower temperature the highest yield. A model was created to calculate the maximum content of material possible to graft over the microspheres, and good correlation to experimental data was found. The efficiency was low for all studied conditions, and suggestions on how to improve it were made. It was also possible to observe through SEM the differences between the interface of samples with different reaction yields, also observing the formation of an organic layer over such spheres, confirming the grafting of polypropylene.