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Gas permeability of thin dense films from polymer blend of thermoplastic elastomer and polyolefin
Author(s) -
Uenishi Masamoto,
Fukushima Noriaki,
Teramachi Masashi,
Mizuta Masahiko,
Kamo Jun,
Tsuru Toshinori
Publication year - 2014
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.39386
Subject(s) - materials science , thermoplastic elastomer , polyolefin , polystyrene , composite material , elastomer , copolymer , polymer , oxygen permeability , ethylene , thermoplastic , polymer chemistry , oxygen , chemistry , biochemistry , catalysis , organic chemistry , layer (electronics)
Stretched thin films composed of a thermoplastic elastomer, a polystyrene‐ block ‐poly(ethylene butylene)‐ block ‐polystyrene triblock copolymer (SEBS), and polyolefins, poly(ethylene‐ co ‐ethylacrylate) and poly(ethylene‐ co ‐propylene), were obtained by blow‐molding, uniaxial stretching, and cooling to room temperature and the gas permeability of the stretched films was investigated. When the as‐blown annealed film was subjected to uniaxial stretching in the machine direction, P O2 and P N2 increased with an increase in the stretching ratio K and approached a constant value at high stretching ratios. In addition, P O2 /P N2 decreased gradually with K and approached a value of 2.95–3.0. The reason for this unique gas permeation behavior is that the molecular mobility of poly(ethylene butylene) chains in a direction normal to the film increases and reaches an equilibrium state at around K = 4.5. The change in gas permeability of the stretched films can be explained using a deformation model for the SEBS matrix. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39386.