Comb-Like Polymer Thin Films Prepared by Ionization-Assisted Deposition of Acrylate Compounds
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B9.46.1
Comb-Like Polymer Thin Films Prepared by Ionization-Assisted Deposition of Acrylate Compounds Hiroaki Usui, Atsuhiro Katayama, Takanobu Honda and Kuniaki Tanaka Department of Material Systems Engineering, Tokyo University of Agriculture and Technology Koganei, Tokyo 184-8588, JAPAN ABSTRACT Alkylacrylate compounds were deposited by the ionization-assisted deposition (IAD) method to form thin films of comb-like polymers having long alkyl side chains on the vinyl polymer backbone. From the source material of n-octadecyl acrylate, polymer thin films having average molecular weight of 6000 were obtained at the polymer yield of 45 to 65%. For the preparation of fluorinated polymer thin films, 1H, 1H, 11H-eicosafluoroundecyl acrylate was used as the source material. Although the conventional evaporation method could not accumulate any films with this material, the IAD was able to produce insoluble thin films that have large contact angle against water droplet. In either material, the polymerization reaction was enhanced with increasing electron emission current for IAD. These results indicate that the IAD enables the preparation of thin polymer coatings that have polyethylene or Teflon-like properties without using the solvents. INTRODUCTION Due to the recent development of functional polymers for optical and electroniccal applications, deposition of polymer thin films is required on various occasions. Conventional polymer deposition methods, such as the casting and the spin coating, rely on solvents, which frequently causes limitations in film purity, microstructure, interface condition, and multilayer formation. Moreover, even the simplest polymers are not always soluble, like polyethylene With this respect, physical vapor deposition of polymer can open new and Teflon(R). possibility that has been inaccessible by the conventional solvent-based methods. The authors have reported the possibility of depositing polymer films from acrylate source materials by using the ionization-assisted deposition (IAD) method [1, 2]. Although the simple evaporation of an acrylate compound produces thin films of the monomer by itself, the IAD method is able to initiate the polymerization reaction due to the activated species generated by electron irradiation to the evaporated source material. In this report, the IAD was employed for the deposition of alkylacrylate compounds to obtain thin films of comb-like polymers as illustrated in Fig. 1. EXPERIMENT Two monomers, the structures of which are shown in Fig. 2, were used as the source material. n-Octadecyl acrylate (18CAc) is a typical alkyl acrylate that forms a simple comb-like polymer of the type shown in Fig. 1. Fluorinated comb-like polymer was prepared by evaporating 1H, 1H, 11H-eicosafluoroundecyl acrylate (20FAc). The latter film is expected to have Teflon-like features such as excellent chemical stability and small surface energy. The materials were used as purchased from Aldrich.
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