MECHANISM OF PHOTOINTTIATED CROSSLINKING OF LOW DENSITY POLYETHYLENE——I. ND SPIN-TRAPPING ESR STUDY

Chinese Journal of Magnetic Resonance ›› 1990, Vol. 7 ›› Issue (4): 359-365.

MECHANISM OF PHOTOINTTIATED CROSSLINKING OF LOW DENSITY POLYETHYLENE——I. ND SPIN-TRAPPING ESR STUDY

Qu Baojun¹, Xu Yunhua¹, Shi Wenfang¹, Xu Guangzhi²

1. University of Science & Technology of China, Hefei;
2. Institute of Chemistry, Acadtmia Sinica, Beijing

Received:1989-06-20 Revised:1990-01-17 Published:1990-12-05 Online:2018-01-23

Abstract

Abstract: 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-?H-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.

Key words: Electron spin resonance, Radical intermediates, Spin trapping, Low density polyethylene, UV irradiation

Qu Baojun, Xu Yunhua, Shi Wenfang, Xu Guangzhi. MECHANISM OF PHOTOINTTIATED CROSSLINKING OF LOW DENSITY POLYETHYLENE——I. ND SPIN-TRAPPING ESR STUDY[J]. Chinese Journal of Magnetic Resonance, 1990, 7(4): 359-365.

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MECHANISM OF PHOTOINTTIATED CROSSLINKING OF LOW DENSITY POLYETHYLENE——I. ND SPIN-TRAPPING ESR STUDY

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