摘要
合成了６种羧酸和羧酸混合稀土（ＲＥ＝Ｌａ＋Ｃｅ＋Ｐｒ）配合物，通过元素分析、热重－差热分析（ＴＧＤＴＡ）、红外（ＩＲ）光谱和紫外（ＵＶ）光谱研究了它们的组成和性质。用红外光谱法测定了含羧酸铈或羧酸共生稀土的低密度聚乙烯（ＬＤＰＥ）ＵＶ光氧化羰基指数，研究了羧酸铈和羧酸共生稀土对ＬＤＰＥ膜ＵＶ光氧化速率及其粘均分子量的影响，并探讨了它们在敏化ＬＤＰＥ膜光氧化降解方面的作用机理。结果表明，在ＬＤＰＥ膜中加入０．１ｗｔ％～０．３ｗｔ％羧酸铈或羧酸共生稀土配合物，即可控光氧化降解ＬＤＰＥ膜的寿命。
Six kinds of cerium carboxylate (CeCar3)(RECar3, RE=La+Ce+Pr) and rare earth carboxylate complexes were synthesized, and the compositions and characters of these complexes were studied by elementary analysis, thermo-gravimetric and differential thermal analysis (TG-DTA),infrared (IR) spectroscopy and ultra violet (UV) spectroscopy. The carbonyl indexes (CI) of low density polyethylene (LDPE) films containing CeCar3 or RECar3 during UV photooxidation were determined by IR spectroscopy. The effects of CeCar3 or RECar3 on the UV photooxidative rates and viscosity average molecular weights (Mη) of LDPE films were studied by using CI and their action mechanisms in sensitizing photooxidative degradation of LDPE films are discussed. Results show that the lifetime of LDPE films can be controlled by adding 0.1 wt～0. 3 wt% CeCar3 or RECar3 complexes to LDPE films.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1996年第2期109-115,共7页
Journal of the Chinese Society of Rare Earths
关键词
低密度聚乙烯
光敏化
稀土元素
合成
配合物
Rare earth carboxylate, Photosensitizer, LDPE, Photooxidative degradation
