A Study of ESR Spectra and Conformation of Propagating Radical in Bulk Polymerization Styrene

Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (1): 123.

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A Study of ESR Spectra and Conformation of Propagating Radical in Bulk Polymerization Styrene

MAO You-Gang, WANG Guo-Bin, ZHENG Ying-Guang, SHEN Jia-Cong

Departmeat of Chemistry, Jilin University, Changchun, 130023

Received:1992-01-03 Revised:1992-07-23 Online:1993-01-24 Published:1993-01-24

Abstract

Abstract: All the ESRspectra of propagating radical of styrene observed in bulk polymerization were studied and can be regarded as the superposition of the spectra of the two inner-rotational conformations of the radical A, B, which were obtained not only from the simulation of the spectra and the analysis of the hyperfine coupling constants, but also from the calculations of the conformation energy.The ratio of the conformation A/Bat the beginning stage of the reaction is 3, 0, being consistent with results coming from Boltzmann distribution.However the ratio gradually decreased with the polymerization and reached 0.2 at the end.The cause of the change has been discussed with respect to thermodynamics and dynamics.

Key words: Styrene, Propagating radical, ESR spectra, Bulk polymerization conformation

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MAO You-Gang, WANG Guo-Bin, ZHENG Ying-Guang, SHEN Jia-Cong. A Study of ESR Spectra and Conformation of Propagating Radical in Bulk Polymerization Styrene[J]. Chem. J. Chinese Universities, 1993, 14(1): 123.

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A Study of ESR Spectra and Conformation of Propagating Radical in Bulk Polymerization Styrene

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