Grafting of Acrylic Acid and Styrene onto Polypropylene in Self-stirring Water Suspension System

Cografting of acrylic acid(AA)and styrene(St)onto polypropylene(PP)was prepared by means of self-stirring water suspension system,with water as dispersion medium,xylene and toluene as interfacial agents,and benzoyl peroxide(BPO)as catalyst.The effects of feed way,interfacial agents,dispersion medium,catalyst,swelling time,reaction time,water polymerization inhibitor and the composition of monomers on the grafting reaction were studied.The optimum conditions were obtained.All the reactants were put in by one-stage process,the feeding ratio of xylene/water/PP/monomer/BPO/tin dichloride was 2.6/15/10/2/0.015/0.005%,the system was swelled at ambient temperature for 4 h,and reacted at 102 ℃ for 6 h,resulted in monomer graft ratio of 11.95% and graft efficiency of 59.75%.When the molar ratio of AA to St was 0.846,the grafting reaction had serious side reaction of disorder copolymerization.Fourier Transform Infrared Spectrometer(FTIR)analysis showed that AA and St had been grafted onto the main chain of PP.