Preparation of Vinyl Acetate/N-Maleimide Copolymer and Its Alcoholysis Product
The solution polymerization of vinyl acetate(VAc)is generally carried out using methanol as solvent,while there are currently few reports on the copolymerization of maleimide(HMI)and VAc using methanol as solvent.In this article,the reactivity ratio of HMI and VAc in methanol calculated according to Finemen-Ross method,is rHMI=4.15 and rVAc=1.76× 10-3.A series of vinyl acetate/N-maleimide copolymers(PVAc/HMI)with different HMI contents were prepared by starvation feeding method,and then the alcoholysis product PVA/HMI was obtained after alcoholysis.The test results show that,the Tg of PVAc/HMI and PVA/HMI is increased by 20％and 12％respectively,while the elastic modulus of PVAc/HMI is increased by 67％,as the HMI feed ratio increases from 0％to 4％.
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