Accession Number : AD0664472
Title : IDENTIFICATION OF FREE RADICALS IN THE PHOTODEGRADATION OF POLYSTYRENE AND ITS HOMOLOGS.
Descriptive Note : Interim rept.,
Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C
Personal Author(s) : Cozzens,R. F. ; Fox,R. B. ; Moniz,W. B.
Report Date : 06 DEC 1967
Pagination or Media Count : 15
Abstract : The photolysis of polystyrene and poly(alpha-methylstyrene) was studied by electron-spin-resonance (ESR) techniques using highly concentrated, glassy solutions of the polymers near liquid-nitrogen temperature. Care was taken to ensure detection of the primary free-radical species. The use of poly(1-vinylnaphthalene) and polystyrene-2,3,4,5,6-d5 verified that the primary free radical is located on the polymer chain and not the ring. The ESR spectra obtained for both polystyrene and poly(alpha-methylstyrene) are consistent with -CH2-PrC(.)-CH2-(.). Interpretation of the observed spectra is made on the basis of the stereochemistry of the polymer chain. (Author)
Descriptors : (*STYRENE PLASTICS, *PHOTOLYSIS), (*FREE RADICALS, STYRENES), STEREOCHEMISTRY, ELECTRON PARAMAGNETIC RESONANCE, NAPHTHALENES, MOLECULAR STRUCTURE, ULTRAVIOLET RADIATION, PHOTOCHEMICAL REACTIONS
Subject Categories : Radiation and Nuclear Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE