功能化多面体低聚倍半硅氧烷的合成与应用

Synthesis and application of functional polyhedral oligomeric silsesquioxane

采用共水解法,以辛基三甲氧基硅烷与γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)为原料,合成了携带一个双键的七辛基甲基丙烯酰氧丙基多面体低聚倍半硅氧烷(简称功能化POSS),探讨了反应条件对功能化POSS产率的影响。结果表明:当盐酸浓度为1.2 mol/L、反应温度为40℃、单体浓度为1.2 mol/L、水与单体物质的量之比为5∶1时,功能化POSS产率可高达54.8%。采用FT-IR、1H-NMR、29Si-NMR对功能化POSS的结构进行了表征。结果表明:功能化POSS的粒径为15~25 nm,且尺寸分布较为均一。将功能化POSS应用于聚丙烯酸酯乳液聚合,发现功能化POSS的引入使乳胶膜接触角从100°提高到112.3°,抗张强度从1.230 N/mm2提高到1.919 N/mm^(2),断裂伸长率从770.37%提高到852.50%。

Polyhedral oligomeric silsesquioxane carrying a double bond(functionalized POSS)is synthesized by co-hydrolysis method with octyltrimethoxysilane andγ-Methacryloxypropyltrimethoxysilane(KH-570)as raw materials.The effect of reaction conditions on the yield of functionalized POSS is discussed.The results show that when the hydrochloric acid is 1.2 mol/L,the reaction temperature is 40℃,the monomer concentration is 1.2 mol/L,and the ratio of water to monomer is 5∶1,the yield of functionalized POSS can reach 54.8%.The structure of functionalized POSS is characterized by FT-IR,1H-NMR and 29Si NMR.The results show that the particle size of functionalized POSS is 15-25 nm,and the size distribution is relatively uniform.The functional⁃ized POSS is applied to polyacrylate emulsion polymerization.It is found that the introduction of functionalized POSS imparts the emulsion film good properties,such as the increase in contact angle from 100°to 112.3°,the increase in tensile strength from 1.230 N/mm^(2) to 1.919 N/mm^(2),and the increase in break elongation from 770.37%to 852.50%.