可紫外光/湿气双重固化聚硅氧烷丙烯酸酯树脂的合成与表征

Synthesis and characterization of ultraviolet/moisture dual-curable polysiloxane acrylates

分别以γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)、端羟基聚二甲基硅氧烷(107)为原料,采用脱醇缩合的方法合成了含不饱和C=C双键和Si-OCH3的聚硅氧烷丙烯酸酯(PSA)。用FTIR,NMR表征其结构,并对双重固化行为进行了研究。结果表明:预聚物在3%光引发剂下进行紫外光固化,其双键的最终转化率可达100%;据Arrhenius方程可以得到在28%相对湿度的环境下,预聚物湿气固化反应表观活化能为23.2kJ/mol。

Ultraviolet（UV）/moisture dual-curable polysiloxane acrylates（PSAs） were prepared from γ-（methacryloyloxy） propyl trimethoxysilane and hydroxyl-terminated polysiloxane through transesterification reaction.The obtained prepolymers were characterized by FTIR,1H-NMR,13C-NMR and 29Si-NMR spectroscopy.The photocuring kinetics of PSA were studied using RT-IR and all the polymerization conversions were high.The moisture-curing kinetics of the prepolymers was studied according to Arrhenius equation.It was found that the curing mechanism can be described as the transforming of Si-O-C into Si-O-Si structure and the moisture curing reaction apparent energy 23.2kJ/mol,impact factor lnA =-5.466.