掺三异丙氧基稀土的聚甲基丙烯酸甲酯的结构与性能

Structure and Property of the Modified PMMA Doped with Rare Earth Isopropoxide

在N2 气保护下 ,无水三异丙氧基稀土 (钐、镝、铒或铽 )掺入甲基丙烯酸甲酯 (MMA)单体中形成凝胶 ,经原位聚合后获得各种稀土掺杂改性的PMMA材料 ,采用FT IR、TG、DMTA、ESEM等对其进行了测试和表征。结果表明 ,改性材料在PMMA良溶剂中大多呈溶胀态 ,其动态力学曲线呈现出类似于交联结构的特征 ,无粘流态出现 ,与PMMA相比 ,改性PMMA的玻璃化转变温度下降 10℃左右 ,相同失重下的分解温度大多提高 5 0℃以上 ;ESEM显示交联网络状结构的改性PMMA中未见聚集体。

A gel was formed by mixing MMA and rare earth (Sm, Dy, Er, and Tb) isopropoxide in N 2 atmosphere. The modified PMMA materials doped with rare earth were prepared by the in-situ polymerization. The materials as characterized by FT-IR, TG, DMTA and ESEM show crosslinked structure feature without viscous flow state and no congragations were observed and most are swollen in good solvents for PMMA. The glass transition temperatures of the modified PMMA are lowered about 10 ℃ than that of the pure PMMA, while their decomposition temperatures are higher in 50 ℃ or more at the same mass loss level..