Viscometric, light scattering, and size-exclusion chromatography studies on the structural changes of aqueous poly(vinyl alcohol) induced by γ-ray irradiation
✍ Scribed by Benlian Wang; Sukekuni Mukataka; Etsuo Kokufuta; Masayo Ogiso; Makoto Kodama
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 160 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0887-6266
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✦ Synopsis
The crosslinking processes of aqueous poly(vinyl alcohol) (PVA) by ␥-ray irradiation were studied by viscometry, dynamic and static light scattering (DLS and SLS), as well as size exclusion chromatography (SEC). Increases in the intrinsic viscosity ([]), molecular weight (M w ), hydrodynamic radius (R h ), and radius of gyration (R g ), and a decrease in second virial coefficient (A 2 ) were observed after ␥-ray irradiation. However, both the values of [] and A 2 for irradiated PVA fell below the data of unirradiated PVA solutions, suggesting a conformational change of PVA chains after ␥-ray irradiation. This structural change of PVA as a result of ␥-ray irradiation was also indicated by the decreases in R g /R h from 1.5 to 1.39 by SLS and DLS, and in Mark-Houwink exponent ␣ from 0.54 to 0.26 by SEC-Viscometry. The broadening of the M w distribution (MWD) as indicated by the polydispersity index increased from 2.2 to 6.5 because of ␥-ray irradiation.