EFFECTS OF GAMMA RADIATION ON POLYMER IN SOLUTION. VI. RADIATION PROTECTION AND PROMOTION IN AQUEOUS SOLUTIONS OF POLY(VINYL ALCOHOL)

Journal Article · Fri Mar 01 04:00:00 EST 1963 · Bulletin of the Institute for Chemical Research, Kyoto University (Japan)

OSTI ID:4687335

Sakurada, I; Ikada, Y

Effects of a number of additives were measured for irradiation of deaerated and aerated aqueous solutions of poly(vinyl alcohol). Systems containing thiourea, methyl ethyl ketone, ethanol, FeSO/sub 4/ + 0.8N H/sub 2/SO/ sub 4/, CuSO/sub 4/, or KBr were examined in detail and it was found that these additives modified the rate of crosslinking as well as degradation of polymers. On the contrary, methanol, K/sub 2/SO/sub 4/, or NaCl did not have any appreciable influence on polymer reactions, although their concentration was fairly high compared with that of the former additives. The various effects of additives could be explained mainly in terms of recombination process and radical transfer in the case of organic additives and electron transfer in the case of inorganic additives. The minimum number of additive molecules per initial polymer molecule required to affect the crosslinking were 0.08 (thiourea), 0.27 (FeSO/sub 4/ + 0.8N H/sub 2/SO/sub 4/), 0.5 (CuSO/sub 4/), 3 (MEK), 10 (KBr), and 17 (ethanol). Discussion of the mechanism of radiation protection and promotion was given on the basis of these experimental results. (auth)

• Research Organization: Kyoto Univ.
• NSA Number: NSA-17-027904
• OSTI ID: 4687335
• Journal Information: Bulletin of the Institute for Chemical Research, Kyoto University (Japan), Journal Name: Bulletin of the Institute for Chemical Research, Kyoto University (Japan) Vol. Vol: 41; ISSN BICRA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AIR
ALCOHOLS
COPPER SULFATES
CROSS-LINKING
ETHYL RADICALS
GAMMA SOURCES
IRON SULFATES
IRRADIATION
KETONES
MECHANICS
METALS, CERAMICS, AND OTHER MATERIALS
METHYL RADICALS
ORGANIC SULFUR COMPOUNDS
POLYMERIZATION
POLYMERS
POTASSIUM BROMIDES
RADIATION EFFECTS
RADIATION PROTECTION
REACTION KINETICS
SOLUTIONS
SULFUR COMPOUNDS
SULFURIC ACID
UREA
VINYL RADICALS