波谱学杂志 ›› 1995, Vol. 12 ›› Issue (6): 581-591.

• 研究论文 • 上一篇    下一篇

低密度聚乙烯光引发交联机理IV.H-和Y-型交联点结构的13C NMR研究

瞿保钧, 徐云华, 瞿欣   

  1. 中国科学技术大学结构分析开放研究实验室, 合肥 230026
  • 收稿日期:1995-01-23 修回日期:1995-03-03 出版日期:1995-12-05 发布日期:2018-01-17
  • 基金资助:
    国家自然科学基金,国家教委留学回国人员资助

MZCHANISM OF PHOTOINITIATED CROSSLINKING OF LOW DENSITY POLYETHYLENE IV. 13C NMR Study of H-and Y-type Crosslinks

Qu Baojun, Xu Yunhua, Qu Xin   

  1. Structure Rasearch Laboratory, Univereity of Science and Technolagy of China, Hefei 230026
  • Received:1995-01-23 Revised:1995-03-03 Online:1995-12-05 Published:2018-01-17

摘要: 首次用溶液高分辨13C NMR研究了由二苯甲酮光引发低密度聚乙烯(LDPE)交联所产生的交联结构,现已观测和鉴定了H型和Y型长链支化两类交联点。对于熔融态紫外光交联5-10s的LDPE样品,其H型和Y型交联点的浓度据估测分别为一万个碳原子中有5.7-16.9和7.6-21.6个结构单元。

关键词: 低密度聚乙烯, 光交联机理, 交联结构, 13C NMR

Abstract: Structures of crosslinks produeed in benzophenone-photoinitiated crosslinking of low density polycthylene(LDPE) have been studied for the firet time by solution-state 13C NMR spedroscopy.The H-links and Y-type long branches have been observed and identified.The concentrations of H-and Y-type crosslinks are estimated to be 5.7-16-9 and 7.6-21.6 structure units pcr 10000 carbon atonis with the LDPE samples UV-irradiated for 5-10 seconds in the melt,respectively.

Key words: Low density polyethylene (LDPE), Photocrosslinking, Crosslink structurt, Mechanism, 13C NMR