Free radicals in the photolysis and radiolysis of polymers:: IV.: Radicals in γ- and UV-irradiated wood and lignin

被引：37

作者：

Kuzina, SI ^{[1
]}

Brezgunov, AY

Dubinskii, AA

Mikhailov, AI

机构：

[1] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Oblast, Russia

[2] Russian Acad Sci, NN Semenov Chem Phys Inst, Moscow 119991, Russia

来源：

HIGH ENERGY CHEMISTRY | 2004年 / 38卷 / 05期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1023/B:HIEC.0000041340.45217.bd

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Free radicals formed in the radiolysis and photolysis of wood and lignin were studied using X-band and D-band EPR measurements. It was found that singlet spectra at g approximate to 2, which appeared upon the low-temperature (77 K) gamma- and UV irradiation of wood and lignin, or singlets detected in a posteffect on heating the irradiated samples belong to radicals having conjugated carbon-carbon bonds. Formyl radicals in gamma-irradiated wood and peroxide radicals in gamma- and UV-irradiated wood were detected for the first time using EPR spectra. The radiation-chemical and quantum yields of radical formation reactions were determined. In wood at 77 K, G(R) approximate to 3.2 1/100 eV and phi(R) approximate to 2 x 10(-3).

引用

页码：298 / 305

页数：8

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