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以聚乙烯吡咯烷酮(PVPON)、聚丙烯酸(PAA)分别为氢键受体和氢键给体,利用层层组装技术制备高分子氢键复合膜.利用紫外-可见光谱、红外光谱及原子力显微镜研究了PVPON/PAA氢键复合薄膜在甲酸、三氟乙酸、磷酸、多聚磷酸中的解离过程.氢键复合薄膜在酸性溶剂中解离速率的快慢为三氟乙酸>磷酸>甲酸.在不同的酸性溶剂中,氢键复合膜的解离机理不同.三氟乙酸体系主要与薄膜中的PAA发生作用,致使PAA与PVPON之间的氢键解离,从而薄膜溶解.而磷酸和多聚磷酸体系则主要与PVPON发生作用,使薄膜溶解.多聚磷酸与磷酸相比,具有更多质子给体基团,与PVPON作用是体现出协同效应.甲酸和PAA同属于羧酸,甲酸分子很难取代PAA,与PVPON形成氢键,其溶解速度非常缓慢.
Poly (vinyl pyrrolidone) (PVPON) and polyacrylic acid (PAA) were hydrogen bond acceptors and hydrogen bond donors, respectively, and were used to fabricate high molecular hydrogen bonding composite films by using the layer assembly technique. The effects of UV, visible and infrared spectra and atomic force microscopy The dissociation process of PVPON / PAA hydrogen bonding films in formic acid, trifluoroacetic acid, phosphoric acid and polyphosphoric acid.The dissociation rate of hydrogen bonding films in acid solvent is faster than trifluoroacetic acid> phosphoric acid> , The dissociation mechanism of the hydrogen bonding composite membrane is different.The trifluoroacetic acid system mainly interacts with the PAA in the membrane and causes dissociation of the hydrogen bonds between the PAA and PVPON to dissolve the membrane.The phosphoric acid and polyphosphoric acid The system mainly works with PVPON to dissolve the film.Polyphosphoric acid has more proton donor groups than phosphoric acid, which shows a synergistic effect with PVPON.Formic acid and PAA belong to carboxylic acid and formic acid molecule Instead of PAA, forming a hydrogen bond with PVPON dissolves very slowly.