Study of the Microwave Grafting of Maleic Anhydride onto P(3 HB-co-4 HB)

P(3 HB-co-4 HB)and maleic anhydride(MAH)were selected as raw materials to prepare P(3 HB-co-4 HB)-gMAH grafting copolymer through microwave irratation.FITR,DSC and PLM were used to characteristize the effects of the dosage of monomer,initiator,as well as irratation time on grafting reaction and also to investigate the crystalline morphology,hydrophilicity and melting behaviors of P(3 HB-co-4 HB)against different grafting ratios.The results show that the grafting reaction of MAH onto P(3 HB-co-4 HB)could be carried out under microwave irratation and grafting ratios from 0.30% to 0.78% could be obtained.The higher grafting ratio,the finer spherulite size,the better hydrophilic and the lower melting temperature of P(3 HB-co-4 HB)-g-MAH.