【作者】 张建国； 罗善国； 谭惠民； 吴亦洁； 景凤英； 裴奉奎；

【Author】 Zhang Jian-Guo ~+Luo Shan-Guo ~+Tan Hui-Min WU Yi-Jie Jing Feng-ying Pei Feng-Kui (Changchun Institute of Applied Chemistry,Changchun 130022) (+Department of Chemical Engineering,Beijing Institute of Technology,Beijing 100081)

【机构】 中国科学院长春应用化学研究所； 北京理工大学化工与材料学院；

【摘要】 <正>聚乙二醇(PEG)在空气中(室温)受到紫外光照射时发生缓慢而复杂的氧化降解.用核磁共振(NMR)波谱跟踪降解过程中的化合物结构变化,发现更多还原

【Abstract】 Polyethylene glycol （PEG,molecular weight 2000） underwent slow but complicated oxidative degradation when irradiated by ultraviolet light of 365 nm in air at ambient temperature.The structural changes during the oxidative degradation have been followed by NMR spectroscopy.It was experimentally found that NMR was much more efficient than FT-IR in characterization the degradation products.Several NMR techniques (¹H NMR,¹³C NMR,DEPT,etc.) have been used to determine the structure of the products and the results indicated that the principal degradation products were formates,carbonyl esters,hemiacetals,alcohols,aldehydes,hemiformal and methoxyl groups.A detailed mechanism for the formation of these products is proposed and discussed.更多还原