文献类型：专利

英文题名：Preparation of in-situ grafted composite material containing barium titanate-modified carbon nanotubes and benzoxazole ring polymer involves preparing carboxylated carbon nanotubes, adding suspension, cooling and heating

作者：LIU X;WEI J;CHEN T;HAN Z;HE J;ZHUANG Q;YAO M

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN103254433-A

申请日：2013-05-21

公开日：2013-08-21

语种：英文

收录：DERWENT

摘要：NOVELTY - Preparation of in-situ grafted composite material containing barium titanate-modified carbon nanotubes and benzoxazole ring polymer involves preparing carboxylated carbon nanotubes, mixing concentrated nitric acid and deionized water to reaction vessel, adding ethanol to reaction vessel, adding aqueous ammonia, filtering, washing with ethanol and deionized water, obtaining titanium hydroxide, adding aqueous sodium hydroxide, adding suspension, cooling, preparing modified barium titanate nanotubes composite absorbents, performing polymerization temperature and heating. USE - Preparation of in-situ grafted composite material containing barium titanate-modified carbon nanotubes and benzoxazole ring polymer (claimed). ADVANTAGE - The in-situ grafted composite material containing barium titanate-modified carbon nanotubes and benzoxazole ring polymer is efficiently prepared with improved microwave absorption performance, and reduced mechanical performance. DETAILED DESCRIPTION - Preparation of in-situ grafted composite material containing barium titanate-modified carbon nanotubes and benzoxazole ring polymer involves preparing carboxylated carbon nanotubes, mixing concentrated nitric acid and deionized water in the ratio of 3:1 to the reaction vessel using a graduated cylinder, adding pure multi-walled carbon nanotubes, obtaining crude product, refluxing condensate under magnetic stirring for 24 hours, controlling the temperature at 120 degrees C, drying resulting product in an anhydrous ethanol, centrifuging and washing with deionized water, washing until the pH is 7, obtaining carboxyl carbon nanotubes, drying obtained nanotube into oven at 70 degrees C for 48 hours, providing into powder using a mortar, obtaining multi-walled carbon nanotubes carboxylic acid, preparing titanium hydroxide, adding ethanol to the reaction vessel, adding tetrabutyl titanate under magnetic stirring, adding aqueous ammonia, filtering resulting product, washing with ethanol and deionized water, obtaining titanium hydroxide, adding obtained multi-walled carbon nanotubes carboxylic acid and titanium hydroxide to another reaction vessel, adding tetrabutyl titanate and barium acetate in the mass ratio of 1:1, and adding ethylenediamine, polyvinyl alcohol solution 200 and ethanolamine solution under magnetic stirring in an ultrasonic dispersion, obtaining homogeneous suspension, adding aqueous sodium hydroxide, then adjusting to pH value of 12, adding suspension to the hot water reactor for 24 hours at 200 degrees C, cooling reaction to room temperature, washing products with dilute hydrochloric acid and ethanol, centrifuging and washing with deionized water, then drying in the anhydrous, placing in an oven at 70 degrees C for 48 hours, grinding into powder, obtaining barium titanate nanotubes-modified composite absorbents, adding 4,6-diamino dihydrochloride and terephthalic acid to the polymerization reactor, adding phosphorus pentoxide with concentration of 80.6 wt.% and polyphosphoric acid, stirring at 60 degrees C, replacing air under nitrogen protection, gradually heating at 90 degrees C, mixing materials, gradually cooling to less than 60 degrees C, preparing modified barium titanate nanotubes composite absorbents, performing vacuum with stirring, replacing the atmosphere with nitrogen for three times under nitrogen protection, and gradually warming at 90 degrees C and degassing, completing degassing, performing polymerization temperature at 100 degrees C, 110 degrees C or 130 degrees C for 12 hours, heating at 150 degrees C for 6 hours and stopping heating.