โ Scribed by Jun Kumagai; Ken-Ichi Oyama; Hiroshi Yoshida; Tsuneki Ichikawa
No coin nor oath required. For personal study only.
ESR and gel permeation chromatographic measurements of poly(diethylsilane) and poly(cyclohexylmethylsilane) v-irradiated at temperatures between 77 K and 300 K were carried out to elucidate the mechanism of radiation-induced degradation of polysilanes. Radical species observed after the irradiation are not silyl-type radicals generated by the cleavage of the Si--Si bond but alkyl radicals generated by the scission of the C--H bond. The G value of the main-chain scission depends strongly on the irradiation temperature and dose. It is proposed that or-conjugation along the main chain allows the migration of the radiation energy to the weakest bond in the main chain where the direct scission of the bond is induced.
๐ SIMILAR VOLUMES
The effect of ionizing radiation on the iron-linked protein (haemoglobin) of the marine lamellibranchs Anadara granosa (LI~N.) and Cardita antiquata (LA~[.) from Bombay waters, India is discussed. Purified haemoglobin solutions were exposed to a 6~ source delivering a dose o{ about 4,600 rad/ min, a