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本文对不同组成比例的乙烯基吡咯烷酮(VP)—醋酸乙烯酯共聚物(COP(VP—VAc))进行了研究,使用红外光谱法(IR)、差示扫描量热法(DSC)、热重分析法(TG)进行表征。DS谱图里,不同组成的共聚物均只有一个玻璃化转变温度(Tg),表明此共聚物为无规共聚物,其Tg与玻璃化转变前后的热容差(△Cp)与均聚物的链结物及组成密切相关。TG研究结果表明共聚物的热稳定性比PVP低而比PVAc高。使用激光光散射法(LLS)和膜式渗透压法(MO),通过重均及数均分子量(Mw和Mn)的测定,来研究共聚物与多酚的络合作用.结果表明,共聚物中,合适的VAc组成比,更能充份发挥VP中吡咯烷酮环功能基团的作用;在聚合物溶液中,反映分子间相互作用参数的第二维利系数(A_2)也随着多酚的加入和共聚物中的VP含量的减少而相应下降,表明络合物及共聚物的水溶性随之减少。
In this paper, vinylpyrrolidone (VP) -vinylacetate (COP) (VP-VAc) with different compositional ratios was studied by means of infrared spectroscopy (IR), differential scanning calorimetry Analytical method (TG) for characterization. In the DS spectrum, the copolymers with different compositions all have only one glass transition temperature (Tg), indicating that the copolymer is a random copolymer with a difference between the Tg (Δ Cp) before and after the glass transition and the homopolymer The link and composition are closely related. TG results show that the thermal stability of the copolymer is lower than PVP but higher than that of PVAc. The complexation of copolymers with polyphenols was investigated by laser light scattering (LLS) and membrane osmometry (MO) as determined by the weight average and number average molecular weights (Mw and Mn) .The results showed that the copolymer , The appropriate VAc composition ratio can fully exert the role of the pyrrolidone ring functional group in VP. In the polymer solution, the second Willy’s coefficient (A 2) reflecting the intermolecular interaction parameter also varies with the polyphenol The decrease of the content of VP in the addition and copolymer decreases correspondingly, which indicates that the water solubility of the complexes and copolymers decreases.