Grafting Polypropylene under Ultrasonic in Water Suspension System

Abstract

Polypropylene (PP) was grafted with styrene (ST), maleic anhydride (MAH) and butyl acrylate (BA) by free radical thermal initiation leading to (PP-g-PSMB) in water suspension system. The effects of ultrasonic frequency and time were investigated on PP grafting ratio in swelling stage. The structure of grafted product was analyzed by FTIR and melt flow rate (MFR), die swell ratio (Dr) and water contact angles of the grafted product were tested. The results show that the grafting ratio of PP can be improved in a short time by using ultrasonic significantly. The grafting ratio of PP increased with the increase of ultrasonic frequency. Ternary-monomer was grafted onto the PP chain branching in the form of long chain uniformly. The surface polarity of the grafted product was improved significantly.