聚乳酸接枝马来酸酐/丙烯酸丁酯共聚物的制备与性能∗

摘要

Maleic anhydride (MAH)/butyl acrylate (BA)grafted poly(lactic acid)(PLA)copolymers (mPLAs) were prepared through solution grafting copolymerization using benzoyl peroxide as initiator,MAH and BA as monomers.The structure and properties of the graft copolymers were characterized by Fourier transform infra-red spectroscopy (FT-IR),wide-angle X-ray diffraction (WAXD),differential scanning calorimetry (DSC)and thermogravimetry (TG).The monomer graft degree on PLA first increases and then decreases with increasing mass ratio of BA to MAH.It reaches the highest value of 1.96% when the mass ratios of BA to MAH and MAH to PLA are 1/1 and 3/100 respectively.Compared with the pure PLA,mPLAs exhibit lower crystallinity and decreased thermal stability.A higher monomer graft degree was associated with a lower crystallinity of the samples.With the increase of mass ratio of BA to MAH,both the melting temperature and glass transition temperature of mPLAs have a trend of declining.%以马来酸酐(MAH)和丙烯酸丁酯(BA)为单体,通过溶液接枝法制备了聚乳酸(PLA )接枝MAH/BA共聚物(mPLA).使用红外光谱(FT-IR)、广角X 射线衍射(WAXD)、差示扫描量热仪(DSC)、热重分析仪(TG)研究了接枝共聚物的结构和性能.结果表明,随着单体质量比BA/MA H 的增加,单体在PLA 上的接枝率出现先增大后减小的趋势,当m(MAH)/m (BA )＝1/1,m (MAH )/m (PLA )＝3/100时,制备的 mPLA 接枝率最高为1．96％；与纯PLA相比,mPLA 的结晶度和热稳定性均比有所下降,且样品的接枝率越大其结晶度越低；随着单体中BA含量的增加,mPLA 的熔融温度和玻璃化转变温度有减小的趋势.