1962•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Requires access
STUDIES ON THE IRRADIATION OF HIGH POLYMERS AT HIGH TEMPERATURES. II. THE EFFECTS OF OXYGEN AND TEMPERATURE ON THE GEL FORMATION OF POLY(VINYL ALCOHOL) IRRADIATED AT ELEVATED TEMPERATURES
Ichiro Sakurada, T. Okada, Hirokazu Abe
Open publisher page 0 citations
Abstract
Samples of 0.08 ~ 0.l3-mm thick PVA film with a water content of approx 5% were irradiated with a 1000-c Co/sup 60/ source at 3.75 x 10/sup 4/ r/hr under various conditions. The results showed that the weight loss of PVA was independent of the temperature and atmosphere but was directly proportional to the radiation dosage. A quantitative analysis of the PVA solubility data is described. G/sub q/ values of crosslinking were 1.5, 2.7, 4.5, and 30.4 in air, and 1.3, 1.6, 2.2, and 3.8 in vacuo for irradiation at 90, 120, 140, and 170 deg C, respectively. G values for the main fractures were 0.27, in vacuo under the same temperature dimensions. The activation energies of cross-linking and main chain fractures were 7.5 and 2.0 kcal/mole in air, and 2.7 and 2.2 kcal/mole in vacuo, respectively, above 100 deg C. Below this temperature, the activation energies decreased in both cases. (OID)