Viscosity-Molecular Weight Relationships of Poly-(Vinyl Acetate) and Poly-(Vinyl Alcohol)

DOI 1 Citations

Bibliographic Information

Other Title
  • ポリ酢酸ビニルおよびポリビニルアルコールの粘度分子量関係
  • V. Viscosity-Molecular Weight Relationship of Poly-(Vinyl Alcohol)
  • 第5報ポリビニルアルコールの粘度分子量関係

Description

Relationships between limiting viscosity number and molecular weight of poly-(vinyl alcohol)(PVA) were studied. It was confirmed by light scattering method that the molecular weight of reacetylated PVAc agreed well with that of the original PVAc specimen, when the PVAc was obtained in low conversion (<10%). Therefore the degree of polymerization of the original PVAc was used for that of the corresponding PVA. The viscosity of aqueous solution of PVA depends on the rate of shear in the range 0-1000 sec--1 at 30°C, when the degree of polymerization of PVA exceeds 1700, and so in such a case the viscosity were corrected to that of zero rate of shear. The relationships between the corrected limiting viscosity number in ml/g [η] and weight and number average molecular weights Mw and Mn for the low coversion of PVA were given by:[η] =4.28×10-2Mw0.64 and [η] =6.70×10-2Mn0.64. The latter equation is coincident with Nakajima's equation obtained in a series of crude fraction of PVA. From these equations for the low conversion samples, the following relationships were derived for the perfectly homogeneous fraction:<BR>[η] = 4.53×10-2M0.64 and [η] = 5.08×10-1P0.64<BR>were P is the degree of polymerization.

Journal

  • Kobunshi Kagaku

    Kobunshi Kagaku 17 (180), 191-196, 1960

    The Society of Polymer Science, Japan

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Details 詳細情報について

  • CRID
    1390282681496678272
  • NII Article ID
    130003835371
  • DOI
    10.1295/koron1944.17.191
  • ISSN
    18848079
    00232556
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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