EFFECTS OF GAMMA RADIATION ON POLYMER IN SOLUTION. III. POLY(VINYL ALCOHOL) PARTIALLY ACETALIZED WITH GLYOXYLIC ACID

Journal Article · Thu Mar 01 04:00:00 EST 1962 · Bull. Inst. Chem. Research, Kyoto Univ.

OSTI ID:4830524

Sakurada, I; Ikada, Y

When polywinyl alcohol (PVA), partially acetalized with glyoxylic acid (PVAG), was irradiated in air-free aqueous solution without added salt, gelation occurred more readily and the critical concentration for gel formation was reduced, as the degree of expansion of PVAG was increased, However, when NaCl was added to the solutions before irradiation so as to mske the expansion of all PVAGs equal to that of parent PVA, the critical concentrations were practically identical to the value of parent PVA independently of their carboxyl group contents. Further addition of the salt to solutions led to the increase in gelation dose. It was concluded from these results that the critical concentration corresponds to the concentration at which the overlap of a polymer with other ones commences. Based on this conclusion, the expansion of the polymer molecule was calculated and compared with that calculated from the viscosity data. These two showed a good agreement. When PVAG was irradiated in aerated aqueous solution without added salt, degradation was promoted with increasing carboxyl group content, while in the case of solutions containing added salts degradation occurred scarcely. (auth)

• Research Organization: Kyoto Univ.
• NSA Number: NSA-16-018951
• OSTI ID: 4830524
• Journal Information: Bull. Inst. Chem. Research, Kyoto Univ., Journal Name: Bull. Inst. Chem. Research, Kyoto Univ. Vol. Vol: 40
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACETATES
AIR
ALCOHOLS
ALDEHYDES
CHEMISTRY
COLLOIDS
DECOMPOSITION
EXPANSION
GAMMA RADIATION
ORGANIC ACIDS
POLYMERS
POLYVINYLS
QUANTITY RATIO
RADIATION EFFECTS
SALTS
SODIUM CHLORIDES
SOLUTIONS
VISCOSITY
WATER