Abstract:
PURPOSE: A polymer/carbon nanotube composite is provided to have excellent electrical conductivity and biodegradability, while maintaining properties of polycarbonate like excellent strength and high heat resistance by using carbon nanotube-lactic acid as a compatibilizer. CONSTITUTION: A manufacturing method of a polymer/carbon nanotube composite comprises: a step of obtaining neutralized liquid by acid treating carbon nanotubes by hydroperoxide water, and adding distilled water into the outcome; a step adding L-lactic acid into the acid-treated multi-wall carbon nanotubes, conduct ultrasonic wave treatment, and removing non-reacted L-lactic acid and water. The polymer/carbon nanotube composite comprises polycarbonate, a biodegradable polymer selected from polylactic acid or polycaprolactone, carbon nanotube-lactic acid compatibilizer, and carbon nanotube.
Abstract:
PURPOSE: A fabrication method of a polymer/carbon nanotube composite is provided to synthesize the polymer/carbon nanotube composite with excellent electromagnetic-wave shielding efficiency and conductivity by uniformly dispersing carbon nanotube in a polymer resin. CONSTITUTION: A fabrication method of a polymer/carbon nanotube composite comprises the steps of: dissolving a first polymer resin and carbon nanotube in a solvent and applying ultrasonic waves to prepare a pre-composite; and mixing the pre-composite with a second polymer resin in an extruder. Carbon nanotubes coagulated in the first step is uniformly dispersed in the first polymer resin by sonication. The first polymer resin and/or the second polymer resin are polycarbonate.
Abstract:
A method of pre-treating a carbon nanotube for a polymer/carbon nanotube composite is provided to use no acid injuring a surface of the carbon nanotube, to improve dispersibility of the carbon nanotube and to disperse the carbon nanotube uniformly in a polymer matrix. A method of pre-treating a carbon nanotube for a polymer/carbon nanotube composite comprises steps of: mixing the carbon nanotube into a solvent; and processing the carbon nanotube in the solvent with an ultrasonic wave at a frequency range of 20,000Hz to 60,000Hz and for 30 to 180 minutes and obtaining a carbon nanotube dispersion solution.
Abstract:
A method for pre-treating carbon nanotubes for carbon nanotube/polymer composites is provided to increase dispersibility of carbon nanotubes for carbon nanotube/polymer composites and allow the production of carbon nanotube/polymer composites having excellent electrical and rheological characteristics. A method for pre-treating carbon nanotubes for carbon nanotube/polymer composites includes the steps of: (1) ultrasonically treating carbon nanotubes in a hydrogen peroxide solution at the temperature of 30-70 ‹C for 50-130 minutes; (2) adjusting pH of the product obtained in the step (1) to 5.0-7.0; and (3) freeze-drying the product obtained in the step (2). The carbon nanotubes are multi-walled carbon nanotubes or single-walled carbon nanotubes.