摘要
将三异丙氧基铽[Tb(OPri)3]直接掺入甲基丙烯酸甲酯(MMA)与苯乙烯(St)的混合单体中,混匀后会立即形成白色凝胶体,通过原位聚合后即获得掺杂Tb(OPri)3的P(MMA co St)共聚物。采用FT IR,DMTA,TG,FS,ESEM等手段对其进行表征。FT IR分析表明,共聚物中Tb3+离子与羰基和苯环间存在着配位作用;MMA与St主要以交替共聚为主。DMTA,TG表明,Tb(OPri)3的掺入,使共聚物的玻璃化温度下降、贮能模量和耐热性能提高。FS分析表明,当Tb含量为1.0%时,共聚物在381nm处发射宽而强的荧光,其强度约是纯P(MMA co St)的14倍,同时在489,544,584nm处发射很强的Tb3+离子5D4→7F6,5D4→7F5,5D4→7F4跃迁的特征荧光。ESEM表明,共聚物呈现交联网络状的微观形貌,未见聚集体,Tb3+离子在体系中是均匀分布的。
The copolymer of P(MMAcoSt) containing Tb was prepared by the insitu polymerization of gel, which was obtained by doping directly triisopropoxyl terbium in the monomer mixtures of methyl methacrylate and styrene. The copolymer was characterized by FTIR, dynamical mechanical thermal analysis (DMTA), TG, fluorescence spectra (FS), ESEM etc. There are coordination interactions between terbium(Ⅲ) ion and carboxyl or phenyl group in the P(MMAcoSt)/Tb. The glass transition temperature (Tg) of P(MMAcoSt) is reduced by the doping of triisopropoxyl terbium, while the storage modulus (E′) and heat resistance of the copolymer are improved. As Tbcontent is 1%, the copolymer can emit very strong fluorescence in 381 nm, the fluorescence strength is 14 times higher than that of pure P(MMAcoSt), moreover exhibits strong characteristic luminescence of terbium ion 5D4→7F6, 7D4→7F5, 5D4→7F4 in 489, 544, 584 nm. ESEM reveal the crosslinking network structure of P(MMAcoSt)/Tb and there is no conglomerate, the terbium(Ⅲ) ion is uniformly distributed in P(MMAcoSt)/Tb.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第2期188-191,共4页
Journal of the Chinese Society of Rare Earths
基金
福建省教育厅资助项目(JA01026)