| In this paper, in order to satisfy the requirement of polyurethane biomedical materials, thermoplastic polyurethane elastomer (TPU) was modified by carbon nanotubes (CNTs) which were functional treated. The kind of carbon nanotubes/fluoride thermoplastic polyurethane low surface energy material with excellent comprehensive performance and good biocompatibility was based on the low surface energy superposition property of CNTs and fluorochemical.Based on principle of rich oxygen plasma activation in carbon nanotubes, we prepared o-CNTs with surface oxygen free radicals. Then, o-CNTs/TPU composite elastomers were prepared via bulk polymerization one-step in situ method. o-CNTs were introduced succeefully. The surface energy of o-CNTs/TPU composite elastomers were reduced with a decrease of 46.5% compared with pure TPU. The tensile strength and elongation at break of o-CNTs/TPU elastomer were 22.3% and 16.7% higher. Besides, the chemical resistance of elastomers were improved.An induced graft polymerization reaction of acrylicacid-3-(perfluoro-3-methykbutyl)-2-hydroxypropylate on the surface of carbon nanotube was developed via plasma technique to obtain newly fluorinated CNTs (f-CNTs). Then the f-CNTs/TPU composite elastomers were by one-step bulk polymerization method. Compared with pure TPU, the surface energy of o-CNTs/TPU composite elastomers were reduced with a decrease of 63.7%, the tensile strength and elongation at break of o-CNTs/TPU elastomer were 40.4% and 26.5%. Besides, the chemical resistance o-CNTs/TPU elastomers were improved.Finally, based on the low surface energy superposition property of CNTs and fluorochemical, the f-CNTs/FTPU ultralow surface energy material was prepared. It has not only ultralow surface energy (decrease of 83.6%) but always high the tensile strength and elongation at break (increase of 77.8% and 31.4%). We got a kind of ultralow surface energy f-CNTs/FTPU composite elastomer with excellent biocompatibility was prepared. |
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