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The ramie fibers originating in China, and later spread to a number of countries in the DPRK, the United States, Japan, Brazil and South America, mainly distributed in the tropical and subtropical regions. Current ramie yield of ramie production country in the world, raw jute production accounts for more than 90% of the global output. Than with cotton fibers, ramie fibers having a high Young's modulus, degree of polymerization is large, the strength of single fiber bundles. Ramie fiber fabric with hygroscopic heat quickly, cool wearing, washable and quick-drying, ventilation, high strength, antibacterial anti-corrosion and other notable features. However, ramie fiber to its high degree of crystallinity and degree of orientation will give the ramie fiber production and life application obstacle. Therefore, to find the new technology will be the ramie industry of our country and even the world's new development opportunities, will also promote local economic development and improve the living standards of the people. Supercritical carbon dioxide is a new green solvent can dissolve the fluorine-containing polymer and an organic silicon compound, which makes it can be used to replace some of the conventional organic solvents used in a particular reaction system, the supercritical carbon dioxide system inquiry pairs environmental protection and the development of new reaction system is of great significance. Reversible addition - fragmentation chain transfer the radicals (RAFT) polymerization technique is a new class of \such as the incomparable advantages of conventional polymerization technique, so in supercritical carbon dioxide using the RAFT technology polymerization of methyl acrylate, trifluoroethyl methacrylate modified ramie fiber is the new green technology for the preparation of new composite materials. By infrared spectroscopy, X-ray diffraction, thermogravimetry, differential scanning calorimetry, scanning electron microscopy, gel permeation chromatography, and surface contact angle of a variety of characterization methods detection analysis prepared ramie fiber-based composite material, that graft polymerization successful , the contact angle of the composite material is up to 149. , Indicating that the material has a high hydrophobic capacity. Polyethylene and measured trifluoroethyl methacrylate, molecular weight distribution index (PDI) of 1.28, and that belong to the \(ATRP), atom transfer radical polymerization technique is a widely used \The effective design of the molecular structure of the polymer, prepared by a variety of different structures, the different features of the new polymer material, i.e. so-called \By ATRP polymerization technique synthetic polymers, obtained by the end groups of the polymer can easily be further functionalized, and the synthesis of the polymer molecular weight distribution is very narrow. Part of this paper is to use the atom transfer radical polymerization solvent polymerization of methyl benzotrifluoride trifluoroethyl acrylate graft modified ramie fiber, 2,2 '- bipyridine / CuBr as catalyst is prepared by the ATRP polymerization techniques successfully prepared ramie fiber group poly trifluoroethyl methacrylate composite materials. Ramie fiber-based composite material via infrared spectroscopy, TGA, scanning electron microscopy, gel permeation chromatography, and a surface contact angle of a variety of analytical methods such as detection, to prove the success of the graft polymerization reaction. Ramie fiber is measured by gel permeation chromatography received on poly trifluoroethyl methacrylate of molecular weight distribution index (PDI) of 1.31, and verified by atom transfer radical polymerization method grafted polymethacrylate trifluoroacetate The polymerization process of the ester \Description This composite material has good hydrophobic properties, is proved by the above variety of characterization means ramie fiber-polyethylene trifluoroethyl methacrylate composite materials of the contact angle of up to 1410, obtained by the contact angle measurement, we prepared having hydrophobic properties new ramie matrix composites. This study tries in supercritical carbon dioxide using reversible addition - fragmentation chain transfer radical polymerization techniques graft polymerization of methacrylic acid trifluoroacetate is a green \fiber surface modification technology provides a reliable green new ways, and to broaden the application of supercritical carbon dioxide in the field of polymer.
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