Solid glycine has been radiolyzed by 60Co γ-rays in vacuo at room temperature, and all the products except H2 have been measured after dissolving the irradiated samples in water. The hydrogen has been collected and measured directly from the irradiated solid samples. All products except H2 increase linearly with the dose, while H2 shows a plateau from a relatively low dose. The yields of products are as follows: G(H2)∼0.2, G(NH3)=4.8, G(CH3NH2)=0.2, G(CHOCO2H)=2.5, G(CH3CO2H)=2.3, G(CO2)∼0.2, and G(HCHO)∼0.03. The mechanisms of the primary process and the reactions to give final products have been proposed with reference to the results of the ESR studies.
It has been shown that (a) α-methylstyrene polymerizes at room temperatures by gamma-ray irradiation; that (b) the reaction proceeds by a radical mechanism, considering from the effect of solvents, additives and ultraviolet light; that (c) ceiling temperature for this monomer is exceptionally low (ca. 70°C) among vinyl monomers, so that it is hard to obtain high polymers by the usual method; that (d) the experimental fact that the velocity of polymerization is proportional to dose rate and not to square root of dose rate can be explained by the assumption that degradative chain transfer occurs more frequently than the termination between active polymers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.