紫外光固化超支化聚硅氧烷改性树脂的合成与表征

Preparation and Characterization of UV-Curable Hyperbranched Polysiloxysilane Modified Resin

以氢封端聚二甲基硅氧烷和乙氧化季戊四醇四丙烯酸酯为反应物,在氯铂酸的催化下发生硅氢加成制备丙烯酸酯基聚硅氧烷(AP)预聚物,以γ-(甲基丙烯酰氧)丙基三甲氧基硅烷为原料制备超支化聚硅氧烷(HPSi),之后将合成的超支化聚硅氧烷加入到丙烯酸酯基聚硅氧烷预聚物中对其进行改性,并加入光引发剂,进行紫外光固化。对固化后的树脂进行接触角、硬度、凝胶率、热重分析,表征不同添加量的超支化聚硅氧烷对丙烯酸酯基聚硅氧烷预聚物性能的影响。结果表明,当超支化聚硅氧烷树脂的添加量为30%时,接触角达到111.7°,邵氏A硬度达到88,凝胶率下降到3.8%,两个最大分解速率Tmax1与Tmax2分别提高到428.9℃和501.3℃,残留量提高到23.8%,树脂的综合性能最为优异。

Acrylate modified polydimethylsiloxane(AP)prepolymer was synthesized through hydrosilylation between hydrogen terminated polydimethylsiloxane and ethoxylated pentaerythritol tetraacrylate under the catalysis of chloroplatinic acid.Globose hyperbranched polysiloxysilane(HPSi)oligomers were synthesized with γ-methacryloxy propyl trimethoxysilane.Different amounts of HPSi were added into AP with photoinitiator.Mixed prepolymers were cured under ultraviolet light.Contact angle,hardness,gel content and thermogravimetric analysis were investigated to show the influence of hyperbranched polysiloxysilane on AP.The results show when the content of HPSi is 30%,the contact angle,shore A hardness and gel content could achieve 111.7°,88 and 3.8%,respectively.The two weight loss temperatures with the maximum decomposition could rise up to 428.9 ℃ and 501.3 ℃.The residue increases to 23.8%,which provides the best comprehensive performance.