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Effect of syndiotactivity on the aqueous poly (vinyl alcohol) gel

  • K. Ogasawara
  • T. Nakajima
  • K. Yamaura
  • S. Matsuzawa
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 58)

Abstract

The mechanism of gelation of aqueous solution of syndiotacticity-rich poly(vinyl alcohol) (PVA) and the structure of junctions in gel were studied. Melting points (T m ) of the gels were measured according to Ferry’s procedure. Gelling ability was highly promoted by slight increase in syndiotactivity. The relation between the concentration of PVA and T m was not linear in the region of lower concentration of PVA. Three types of intermolecular hydrogen bond were assumed following the concentration of PVA. The gels chilled at lower temperature of PVA having the content of syndiotactic diads above 60.9% showed remarkable syneresis accompanying the rise of temperature. This phenomena seems to be a result of the breakdown of the unstable junctions and further growth of the crystallites. The X-ray diffraction pattern of the gel chilled at higher temperature was clearer than that at lower temperature and that pattern because progressively clearer with increasing content of syndiotacticity. These results lead to the conclusion that the structure of junction in network of PVA-water gel must consist of crystallites formed by the syndiotactic sequence parts.

Keywords

Vinyl Alcohol Vinyl Acetate Aqueous Poly Syndiotactic Sequence Apparent Melting Point 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1).
    Mandelkern, L., Crystallization of Polymer, p. 112 (New York, 1964).Google Scholar
  2. 2).
    Eldridge, J. E. and J. D. Ferry, J. Phys. Chem. 58, 992 (1954).CrossRefGoogle Scholar
  3. 3).
    Maeda, H., T. Kawai and R. Kashiwagi, Kobunshi Kagaku 13, 193 (1956).Google Scholar
  4. 4).
    Go, Y., S. Matsuzawa and K. Nakamura, Kobunshi Kagaku 25, 62 (1968).Google Scholar
  5. 5).
    Sone, Y., K. Hirabayashi and I. Sakurada, Kobunshi Kagaku 10, 1 (1953).Google Scholar
  6. 6).
    Shibatani, K., Polymer J. 1, 348 (1970).Google Scholar
  7. 7_.
    Takahashi, A. and S. Hiramitsu, Polymer J. 6, 103 (1974).CrossRefGoogle Scholar
  8. 8).
    Mochizuki, T., Nippon Kagaku Zashi 81, 15 (1960).Google Scholar
  9. 9).
    Morawets, H., Macromolecules in Solution, p. 77 (New York, 1966).Google Scholar
  10. 10).
    Nagai, E., S. Kuribayashi, M. Shiraki and M. Ukida, J. Polymer Sci. 35, 295 (1959).CrossRefGoogle Scholar
  11. 11).
    Shimanouchi, T. and M. Oka, Preprint (Physics) of 12th Symposium on Polymer Chemistry, p. 323 (Nagoya, 1963).Google Scholar
  12. 12).
    Go, Y., S. Matsuzawa, K. Nakamura, I. Saito, T. Hayashi and T. Ina, Kobunshi Kagaku 24, 715 (1967).Google Scholar
  13. 13).
    Pines, E. and W. Prins, Macromolecules 6, 888 (1973).CrossRefGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1975

Authors and Affiliations

  • K. Ogasawara
    • 1
  • T. Nakajima
    • 1
  • K. Yamaura
    • 1
  • S. Matsuzawa
    • 1
  1. 1.Department of Textile Industrial Chemistry Faculty of Textile Science and TechnologyShinshu UniversityNaganoJapan

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