Effect of α-substituents on molecular motion and wetting behaviors of poly(fluoroalkyl acrylate) thin films with short fluoroalkyl side chains |
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Authors: | Koji Honda Ikuo Yamamoto Masamichi Morita Hiroki Yamaguchi Hiroshi Arita Ryohei Ishige Yuji Higaki Atsushi Takahara |
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Affiliation: | 1. Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. Chemical R&D Center, Daikin Industries, Ltd., 1-1 Nishi Hitotsuya, Settsu-shi, Osaka 566-8585, Japan;3. Institute for Materials Chemistry and Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan;4. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), 744, Motooka, Nishi-ku, Fukuoka 819-0395, Japan |
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Abstract: | The effect of α-substituent on the molecular motion and wetting behavior of poly{2-(perfluorobutyl)ethyl acrylate} PFA-C4], poly{2-(perfluorobutyl)ethyl methacrylate} PFMA-C4], poly{2-(perfluorobutyl)ethyl α-fluoroacrylate} PFFA-C4], and poly{2-(perfluorobutyl)ethyl α-chloroacrylate} PFClA-C4] films were characterized by dynamic contact angle measurement, lateral force microscopy (LFM), wide angle X-ray diffraction (WAXD), and X-ray photoelectron spectroscopy (XPS). WAXD of oriented PFClA-C4 fiber suggested the presence of rod-like chain due to the presence of bulky α-substituent. The glass transition temperature (Tg) of PFFA-C4 and PFClA-C4 were well above the room temperature. The water repellencies of PFFA-C4 and PFClA-C4 were as high as that of PFMA-C4 and their oil repellency of PFFA-C4 and PFClA-C4 was higher than the PFMA-C4. This result was originated from the low main chain mobility of PFFA-C4 and PFClA-C4 due to the presence of bulky α-substituents. The effect of molecular motion on water repellency was clarified by the results of temperature dependence studies of dynamic contact angle, LFM, and surface chemical composition measured by XPS. |
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Keywords: | Fluorine polymers Water repellency Surface molecular motion |
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