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- W285443707 abstract "Dilute aqueous solutions of poly(acrylic acid) in acid form and in sodium-salt form were irradiated with gamma rays from a Co/sup 60/ source both in the presence and in the absence of air. Changes in gelation dose and viscosity were measured. On irradiation in the absence of air, gel formation was observed, and both the gelation dose and the critical concentration for gel-formation increased as the degree of neutralization of polymers increased. The critical concentrations were 0.25, 0.30, 0.56, and 1.0 wt%, for polymers with degrees of neutralization of 0, 5, 10, and 20%, respectively. When NaCl was added to the solution for irradiation so as to diminish the ionization of carboxyl groups, gelation occurred more readily with increasing NaCl concentration, if the NaCl concentration was relatively low. However, as the concentration of NaCl became higher than 0.01N, gel formation was increasingly suppressed with increasing NaCl concentration. This fact demonstrates that there is an optimum expansion of polyion for crosslinking in aqueous solution. On irradiation in the presence of air, the polymer appeared to degrade exclusively. The higher the degree of neutralization, the higher the degree of degradation. If, however, NaCl was present sufficiently in the solution for irradiation, degradationmore » did not occur practically. (auth)« less" @default.
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- W285443707 date "1963-03-01" @default.
- W285443707 modified "2023-09-23" @default.
- W285443707 title "EFFECTS OF GAMMA RADIATION ON POLYMER IN SOLUTION. IV. CROSSLINKING AND DEGRADATION OF POLY(ACRYLIC ACID) IN AQUEOUS SOLUTION" @default.
- W285443707 hasPublicationYear "1963" @default.
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