tailieunhanh - Báo cáo hóa học: " Electrical resistance of CNT-PEEK composites under compression at different temperatures"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Electrical resistance of CNT-PEEK composites under compression at different temperatures | Mohiuddin and Van Hoa Nanoscale Research Letters 2011 6 419 http content 6 1 419 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Electrical resistance of CNT-PEEK composites under compression at different temperatures Mohammad Mohiuddin and Suong Van Hoa Abstract Electrically conductive polymers reinforced with carbon nanotubes CNTs have generated a great deal of scientific and industrial interest in the last few years. Advanced thermoplastic composites made of three different weight percentages 8 9 and 10 of multiwalled CNTs and polyether ether ketone PEEK were prepared by shear mixing process. The temperature- and pressure-dependent electrical resistance of these CNT-PEEK composites have been studied and presented in this paper. It has been found that electrical resistance decreases significantly with the application of heat and pressure. Keywords Compression pressure Carbon nanotubes Polyether ether ketone PEEK electrical resistance tunneling Introduction Electrical conductivity of thermoplastic composites containing carbon nanotubes CNTs is due to the formation of a continuous conductive network in the polymer matrix 1 . This network consists of specific spatial arrangement of conductive elements so that low resistance electrical paths are developed for free movement of electrons. Enhancement of electrical conductivity of polymer by mixing them with multiwalled carbon nanotubes has found significant applications in newer areas such as electrostatic charge dissipation electronic equipment pressure sensors sensor of vehicle weight in highways selective gas sensors and strategic materials such as EMI RFI shielding in computer and cellular phone housing etc. 2-4 . The electrical resistance of conductive polymeric composites changes with externally applied heat and pressure 5 6 . Surveying of literature shows that most researchers so far explored the applicability of pressure sensors made of carbon black carbon .