Synthesis of acrylic modified chlorinated polypropylene and its solvent solubility

T he modified chlorinated polypropylene (CPP) was prepared upon chlorination of PP, initiated by benzoyl peroxide (BPO), grafted with methyl methacrylate (MMA), butyl acrylate (BA) and methacrylic acid (MAA) as graft monomers by tetrabasic graft copolymerization. The modified CPP was characterized by FTIR. The effects of reaction temperature, reaction time, initiator concentration and monomers concentration on the graft degree were investigated. The optimum reaction condition was determined as follows: reaction temperature 105 degrees C, reaction time 5 h and the mass ratio of CPP/monomers/BPO = 1:0.3:0.03. The adhesive power of graft copolymer on polypropylene sheets was 100%. The solubility parameter and solvent properties of CPP and modified CPP were systematically studied to characterize their polar change. The solubility results of CPP and modified CPP in various solvents indicated that the polarity of CPP gradually increased with grafting monomers onto its chain, which would cause the moderately hydrogen bonded solvents for polymers improving more with an increase in monomers graft content, whereas that of poorly and strongly hydrogen bonded solvents for polymers show no clear change. This is consistent with the results of their dilution ratio and solubility parameter.