聚乙烯醇/二氧化硅互穿网络膜的研究  

Study of Novel PVA/SiO_2 Interpenetrating Polymer Network Membranes

作　　者：全凤玉[1] 夏延致[1] 纪全[1] 陈丽丽[1] 

机构地区：[1]青岛大学纤维新材料与现代纺织国家重点实验室培育基地,山东青岛266071

出　　处：《精细化工》2008年第10期937-939,944,共4页Fine Chemicals

基　　金：973前期研究专项(No.2006CB708603)~~

摘　　要：采用溶胶凝胶法制备了聚乙烯醇/二氧化硅有机/无机互穿网络结构。扫描电子显微镜(SEM)观察到样品表面光滑,均匀;原子力显微镜(AFM)观察到样品中无机相与有机相呈互穿网络结构,且随无机物的增多两相分布更均匀;元素分析结果为纯PVA中w(O)为38%,随着无机物的增多w(O)逐渐降低为24.9%,是硅羟基与醇羟基之间脱去水,两相之间进行交联的结果;29SiNMR表明随无机物的增多,化学位移Q3的强度有所降低而化学位移Q4值却略有上升,说明硅羟基含量逐渐减少,两相交联程度逐渐增大,与元素分析结果相印证;热重曲线(TG)表明,无机物的加入使PVA的热降解温度由400℃提高到420℃,进一步证明两相之间已形成网状结构。Organic/inorganic interpenetrating polymer network （IPN） was prepared through sol-gel reaction of poly （ vinyl alcohol） （PVA） with tetraethylorthosilicate （TEOS）. The structure of the PVA/ TEOS membranes was characterized by scanning electron microscopy （SEM）, atomic force microscope （AFM）, energy dispersive spectroscopy （EDX）, elementary analysis and 29Si-NMR. The SEM micrographs showed the surface of membranes to be uniform and homogeneous. AFM indicated that there is good compatibility in the system due to the resulting cross-linked network of organic and inorganic phases, w （O）% of PVA/SiO2IPN decreases from 38% （as in pure PVA） to 24. 9%, indicating the condensation reaction between Si--OH groups from hydrolyzed TEOS and C--OH groups from PVA. It was also established by 29Si-NMR that the intensity of Q3 decreases, but the intensity of Q4 increases. The thermal property of PVA/SiO2 IPN was examined by thermogravimetric analysis （TGA）. The decomposition temperature of the main chain is raised from 400 ℃ to 420 ℃. The PVA/SiO2 IPN exhibits high thermal stability, which suggests that some kind of bonds is formed between PVA and SiO2 and enhances the thermal stability of the materials.

关 键 词：聚乙烯醇 二氧化硅 互穿网络 功能材料 

分 类 号：TQ127.2[化学工程—无机化工] TQ325.9