surface-initiated atom transfer radical polymerization and solution intercalation methods for preparation of cellulose-g-ps-g-pan/mmt bionanocomposite
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abstract
cellulose was modified by polystyrene (ps) and polyacrylonitrile (pan) via free radical and living radical polymerization, and then cellulose was used as the matrix in the preparation of polymer/clay nanocomposite, through a solution intercalation method. for this purpose, first, the graft polymerization of styrene (st) onto cellulose fibers was performed by using suspension polymerization and the free-radical polymerization technique in the presence of potassium persulfate (pps). second, the synthesized cellulose-graft-polystyrene was brominated by n-bromosuccinimide (nbs) to obtain polymers with bromine a group. third, the brominated cellulose fibers were used as macroinitiators in the atom transfer radical polymerization (atrp) of acrylonitrile (an) in the presence of cucl / 2, 2’-bipyridine (bpy) catalyst system in thf solvent at 90˚c to prepare the cellulose-graft-polystyrene–graft–polyacrylonitrile. forth, for preparing the modified clay, na-mmt was mixed with hexadecyl trimethyl ammonium chloride salt. finally, cellulose-graft-polystyrene–graft–polyacrylonitrile/organoclay bionanocomposite was prepared in ccl4 by a solution intercalation method. then, the structure of the obtained terpolymer was investigated by ft-ir, dsc, tga, xrd, and sem techniques. moreover, the structure of the bionanocomposite was probed by xrd, sem, and tem images.
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Journal title:
journal of petroleum science and technologyجلد ۷، شماره ۱، صفحات ۲۳-۳۴
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