EFFECTS OF GAMMA RADIATION ON AQUEOUS SOLUTIONS OF VARIOUS POLYMERS (in Japanese)
Radioinduced crosslinking of poiyvinyl alcohol, polyvinyl alcohol partially acetalized with glyoxylic acid, and polyacrylic acid in aqueous solutions was investigated in the absence of air. The critical concentration for gel formation was found to shift to lower concentration in all cases as the dimension of the polymer spheres increased. However, when the charge density in polyacrylic acid became fairly high, the critical concentration increased with increasing expansion of polyions, indicating the prevention of crosslinking of polyions by the strong electrostatic repulsion due to ionized groups. Irradation of aqueous solutions of polyvinyl alcohol below the critical concentration resulted in the formation of intermolecular crosslinking at the initial stage of irradiation, and thereafter the crosslinking occurred preferentially between the polymer segments belonging to the same molecule. The results are all consistent with the hypothesis that the critical concentration is no other than the polymer concentration where polymer spheres just commence to overlap with each other within the solution. The peculiar curve of gelation dose against polymer concentration, which is commonly observed when dilute aqueous solutions of crosslink-type polymers are irradiated in the absence of air, can be explained by the results. (P.C.H.)
- Research Organization:
- Kyoto Univ.
- NSA Number:
- NSA-17-030206
- OSTI ID:
- 4680571
- Journal Information:
- Proc. Japan Conf. Radioisotopes, Journal Name: Proc. Japan Conf. Radioisotopes Vol. Vol: 5th, No. 4
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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