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Phase structure in the blend of atactic poly(vinyl alcohol) with atactic poly(vinyl alcohol‐ block ‐vinyl acetate)
Author(s) -
Tanigami Tetsuya,
Maruyama Nobuyuki,
Yamazaki Koji,
Ichikawa Yoko,
Nagai Hiroyuki,
Shimizu Kaori
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10359
Subject(s) - vinyl alcohol , vinyl acetate , saponification , materials science , differential scanning calorimetry , polymer chemistry , casting , phase (matter) , chemical engineering , polymer blend , copolymer , composite material , polymer , organic chemistry , chemistry , physics , engineering , thermodynamics
An almost fully saponified atactic poly(vinyl alcohol) and an atactic poly(vinyl alcohol‐ block ‐vinyl acetate) of which degree of saponification is 89 mol % were blended by a solution casting method. The phase structure of the blend film was analyzed by optical microscopy, 13 C‐NMR, and differential scanning calorimetry. The most remarkable structure of the blend was composed of cylindrical domains penetrating the film. The swelling behavior of the blend films was also investigated in the dimethylsulfoxide and water mixed solvents to find differences in solubility and diffusion behavior between the matrix and the domain. The cylindrical domains could be selectively dissolved away in water and the film became porous. We tried to change the size of the cylindrical domain with various film preparation conditions. This aimed to turn the film into the useful filter membrane. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1807–1815, 2002