New bleeding model of additives in a polypropylene film under atmospheric pressure II |
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Authors: | Makoto Wakabayashi Takayuki Kohno Tokutaro Kimura Satoshi Tamura Masahiko Endoh Satoru Ohnishi Toshikatsu Nishioka Yoshikatsu Tanaka Toshitaka Kanai |
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Affiliation: | 1. Idemitsu Kosan Co., Ltd., Ichihara, Chiba 299‐0193, Japan;2. Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920‐1192, Japan;3. Prime Polymer Co., Ltd., Sodegaura, Chiba 299‐0265, Japan;4. Idemitsu Unitech Co., Ltd., Sodegaura, Chiba 299‐0205, Japan |
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Abstract: | Many additives are commercially used to add more favorable qualities to films. The bleeding process by which the additive in a film comes to the surface is considered. A new bleeding model of additives in a polypropylene film under atmospheric pressure was investigated. Solubility and diffusion are found to be important for explaining this bleeding process. It was found that the experimental results were explained more precisely by assuming a two‐step transport process between the crystalline regions and the amorphous ones. The solubilities and diffusion coefficients of UV‐stabilizers such as 2‐(2H‐benzotriazol‐2‐yl)‐4‐(1,1,3,3‐tetramethylbutyl)phenol and 2‐(2H‐benzotriazol‐2‐yl)‐4‐methylphenol were determined at 40°C. The difference between the saturation solubilities and the diffusion coefficients of UV‐stabilizers was discussed by comparing with the results of molecular dynamics (MD) simulation. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 |
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Keywords: | polypropylene films additives solubility diffusion |
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