Gas permeability of thin dense films from polymer blend of thermoplastic elastomer and polyolefin |
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| Authors: | Masamoto Uenishi Noriaki Fukushima Masashi Teramachi Masahiko Mizuta Jun Kamo Toshinori Tsuru |
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| Affiliation: | 1. Corporate Research Laboratories, Mitsubishi Rayon Co., Ltd., Ohtake, Hiroshima, Japan;2. Present address: Head Office, Mitsubishi Rayon Co., Ltd., Chiyoda‐ku, Tokyo, Japan;3. Present address: Graduate School of Engineering, Nagasaki University, Nagasaki, Japan;4. Department of Chemical Engineering, Hiroshima University, Higashi‐Hiroshima, Hiroshima, Japan;5. Present address: Toyohashi Corporate Research Laboratories, Mitsubishi Rayon Co., Ltd., Toyohashi, Japan |
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| Abstract: | 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, PO2 and PN2 increased with an increase in the stretching ratio K and approached a constant value at high stretching ratios. In addition, PO2/PN2 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. |
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| Keywords: | elastomers polyolefins membranes blends structure‐property relations |
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