Preparation and Characterization of C 60 -Perdeuterated Styrene Copolymer Nanofilms
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Preparation and Characterization of C60-Perdeuterated Styrene Copolymer Nanofilms Zhang Lin, Du Kai, Zhang Houqiong, Fan Yongheng, Tu Haiyan and Luo Xuan Institute of Nuclear Physics and Chemistry, CAEP, P.O.Box 919-987, 621900, Mianyang, P.R. China Abstract C60-Perdeuterated Styrene Copolymer (C60-DPS) was synthesized by the free radical polymerization. Thin films of C60-DPS were prepared by the Langmuir-Boldgett (LB) technique. The surface morphology and friction performance were characterized by atomic force microscopy (AFM). Results exhibit the presence of spherical granules in the compact LB films, which result from self-polymerization of C60 and showed friction of the LB films increased basically as C60 content of C60-DPS decreased. Introduction Thin polymer films are useful in many practical and commercial applications such as sensors, detectors, displays, electronic circuit components and the investigation on interfacial phenomena of polymer[1,2]. Different techniques are used to prepare the thin polymer films. The Langmuir-Boldgett (LB) technique is one of the most promising techniques for prepare such thin films, because it enables (1) deposition of thin films on almost any kind of solid substrate; (2) homogeneous deposition of large area of thin films; (3) the precise control of the film thickness; (4) deposition of multiplayer with various composition[3]. Although the preparation and performances of the C60 doping polymer thin films have attracted significant attention recently, the investigation on C60 doping perdeuterated polymer have been reported rarely. In the present study, the C60-Perdeuterated Styrene Copolymer (C60-DPS) was synthesized by free radical polymerization and thin films of C60-DPS were prepared by the Langmuir-Boldgett (LB) technique. The measurement of surface morphology and friction performance of the thin films showed friction of the LB films increased basically as C60 content of C60-DPS decreased, and some rift-type defects in the LB films increased friction of the LB films. Experiment Details Perdeuterated styrene was purchased from Aldrich Chem. Co. It was treated with NaOD heavy water solution and pure heavy water, dried with calcium chloride and calcium hydroxide before used. C60 was prepared by arc method, and purified through the alumina column. Added some amount of C60 and catalyst into the toluene solution of the perdeuterated styrene, heated 24h at 60oC in an aqueous bath, washed reaction system with distilled water, and precipitated with methanol. Polymer powder was obtained by drying the precipitate in a vacuum oven. The IR spectra of the C60-DPS samples were measured by the Nicolet 200SXV FT-IR spectroscopy. DD6.6.1
C60-DPS was dissolved in chloroform with a concentration of 3mg/mL. The LB through used is a product of Southeast University. A 0.4mL of the sample solution taken up by a micro syringe was spread on the aqua subphase in the LB through. The C60-DPS monolayer was formed at the high target pressure of 50mN/cm, and then the monolayer was transferred to a sili
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