摘要
本文使用2,3,5,6——四甲基亚硝基苯(ND)自旋捕捉ESR技术研究了由二苯甲酮(BP)光引发低密度聚乙烯(LDPE)交联自由基中间体。采用改变温度和熔融态检测到分辨得很好的氮氧自旋加合物自由基ESR谱的方法,鉴定了光引发LDPE交联前躯自由基主要为仲碳自由基,-CH_2-CH-CH_2-和叔碳自由基,由此可见,BP引发LDPE的光交联反应主要发生在仲碳和叔碳原子上。
The radical intermediates formed by photoinitiated crosslinking of low density polyethylene ( LDPE) with benzophenone ( BP) as photoinltiator have been investigated by spin-trapping ESR technique using 2,3,5,6-tetramethylnitrosodurene (ND). By the temperature change and determining the well -resolved ESR spectrum of the nitroxide spin-adducts at the melt, the following two radicals could be identified: one was the secondary carbon radical,
CH2-CH-CH2-,another was the tertiary carbon radical,
Based on these results, the photocrosslinking reactions of LDPE initiated by BP mainly take place at the secondary and tertiary carbons.
出处
《波谱学杂志》
CAS
CSCD
1990年第4期359-365,共7页
Chinese Journal of Magnetic Resonance
基金
国家自然科学基金会
中国科技大学结构研究实验室的资助项目
关键词
聚乙烯
光交联
电子自旋共振
Electron spin resonance,Radical intermediates,Spin trapping,Low density polyethylene,UV irradiation.
