乙烯基POSS的合成及POSS/PMMA纳米复合材料的制备  

Synthesis of Vinyl-Group POSS and Preparation of POSS/PMMA Nanocomposite

作　　者：薛亮忠[1] 林晓丹[1] 胡新嵩 徐茜[1] 

机构地区：[1]华南理工大学材料学院,广东广州510640 [2]广州高士实业有限公司,广东广州510560

出　　处：《高分子材料科学与工程》2015年第1期148-152,157,共6页Polymer Materials Science & Engineering

基　　金：广州市科技计划项目(2013J4500065)

摘　　要：利用乙烯基三甲氧基硅烷缩合水解制备八聚乙烯基笼型倍半硅氧烷(OvPOSS),然后将其与γ-巯丙基三乙氧基硅烷(KH580)采用巯基-烯点击化学反应制备带有部分乙烯基和烷氧基的POSS,用红外光谱、核磁共振、凝胶渗透色谱、飞行质谱等手段对其结构进行表征分析。通过自由基聚合将POSS引入聚甲基丙烯酸甲酯(PMMA)中,制备新型纳米复合材料EV-POSS/PMMA,利用X射线衍射、扫描电镜、热重分析探讨了OvPOSS、EV-POSS在PMMA中的形态特征、分散性、透光率及材料的热稳定性能。结果显示,OvPOSS在PMMA中结晶程度大,分散性差,导致其对PMMA的热稳定的影响不明显;EV-POSS则呈现良好的分散性,包覆于PMMA中,对PMMA的热稳定性提高显著,同时对于PMMA的透光率影响较小。octavinyloctasilsesquioxane(OvPOSS)was synthesized with vinyltriethoxysilane under acidic condition.Then through radical thiol-ene addition click reaction,a new multi-vinyl and ethoxy POSS(EV-POSS)was synthesized in the presence of OvPOSS and(γ-mercaptopropyl)triethoxysilane(KH-580).The structure of the products was confirmed by 1 H/29Si-NMR,FT-IR,mass spectroscopy and GPC.Then a series of OvPOSS/PMMA and EV-POSS/PMMA nanocomposites were prepared by addition of different kinds of POSS into PMMA.Different morphological features were investigated by XRD and SEM,the results show that OvPOSS crystallizes severely and EV-POSS is well-dispersed in PMMA.Through TGA,EV-POSS is useful to raise the thermal stability because of its good dispersion.The initial degradation temperature can rise by 64.3 ℃ by adding only 1% EV-POSS.

关 键 词：乙烯基笼型倍半硅氧烷 γ-巯丙基三乙氧基硅烷 纳米复合材料 热稳定性 

分 类 号：TQ317[化学工程—高聚物工业] TB332[一般工业技术—材料科学与工程]