Mechanical properties and water permeability of the A-B-A tri-block copolymer consisting of poly(.GAMMA.-benzyl D,L-glutamate) or poly(.GAMMA.-methyl D,L-glutamate) as the A component and polybutadiene as the B component.

DOI 15 References Open Access
  • Chen Guan-Wen
    Research Center for Medical Polymers and Biomaterials, Kyoto University
  • Hayashi Toshio
    Research Center for Medical Polymers and Biomaterials, Kyoto University
  • Nakajima Akio
    Research Center for Medical Polymers and Biomaterials, Kyoto University

Bibliographic Information

Other Title
  • Mechanical Properties and Water Permeability of the A–B–A Tri-Block Copolymer Consisting of Poly(γ-benzyl D,L-glutamate) or Poly(γ-methyl D,L-glutamate) as the A Component and Polybutadiene as the B Component

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Description

Membranes of A–B–A tri-block copolymers were prepared by polymerizing poly(γ-benzyl D,L-glutamate) or poly(γ-methyl D,L-glutamate) as the A component and polybutadiene as the B component. The mechanical properties of and the hydraulic permeability of water were examined and compared with those properties for A–B–A tri-block copolymers consisting of poly(γ-benzyl L-glutamate) or poly(γ-methyl L-glutamate) as the A component and polybutadiene as the B component. The temperature dependence of the dynamic modulus and the loss modulus were investigated based on Takayanagi’s mechanical model. The mechanical properties led to the conclusion that the dynamic mechanical spectra could be well explained by the microheterophase structure observed with an electron microscope. In the case the shape of the inclusion phase was assumed to be spherical, the storage modulus E′ calculated by means of Takayanagi’s equation showed excellent agreement with the experimental data for D,L-type block copolymers, indicating that spherical inclusion phases exist in them in spite of their rather high volume fractions of the B portion. The hydraulic permeability coefficient K of water through D,L-type block copolymer membranes was remarkably lower than that of L-type membranes. This may indicate that the A domains are homogeneous in shape and dispersion state for the D,L-type block copolymer, owing to the existence of a molecular chain portion capable of forming interchain hydrogen bonds.

Journal

  • Polymer Journal

    Polymer Journal 16 (11), 805-814, 1984

    The Society of Polymer Science, Japan

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Details 詳細情報について

  • CRID
    1390282681264514432
  • NII Article ID
    130004767764
  • DOI
    10.1295/polymj.16.805
  • COI
    1:CAS:528:DyaL2MXhsV2ktL4%3D
  • ISSN
    13490540
    00323896
  • Text Lang
    en
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
    • OpenAIRE
  • Abstract License Flag
    Disallowed

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