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.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2008年第10期937-939,944,共4页
Fine Chemicals
基金
973前期研究专项(No.2006CB708603)~~
关键词
聚乙烯醇
二氧化硅
互穿网络
功能材料
poly （ vinyl alcohol）
SiO2
interpenetrating polymer network
functional materials
