Photochemical reactions on polymers

G. J. Smets, S. N. El Hamouly, T. J. Oh
1984 Pure and Applied Chemistry  
Between the several polymer photocross-linking processes, free radical reactions remain very important. Two main cases are considered successively. In the first process, photocross-linking results from the photoinitiated free radical polymerization of methacrylic side groups attached to copolymers of butyl-methacrylate and glycidylmethacrylate after reaction with methacrylic acid. The kinetics of photocross-linking in the solid state of copolymers with different content of unsaturated groups
more » ... om 11 to 51 molar %) were followed by differential scanning calorimetry, infrared spectrometry and by gravimetry, and the results of these methods compared to each other. In the second case, photocross-linking results from the formation of photoexcited electron-donor -acceptor complexes, in which hydrogen exchange may occur with formation of free radical. Several copolymers of vinylbenzophenone and p.dimethylaminostyrene were used and their solution behavior on irradiation considered by ultraviolet absorption, phosphorescence emission spectrometry, and by gel permeation chromatography. The influence of the copolymer composition on chain degradation and branching during irradiation was taken in evidence. Similarly the rate of insolubilization in solid state was studied in function of the copolymer composition and irradiation conditions.
doi:10.1351/pac198456030439 fatcat:nrdxrzszyngmxaffuyas5toqla