Synthesis and Characterization of Polyureas from Aniline Trimer with TDI, MDI and HDI as pH Sensitive Materials  

作　　者：刘四委 张艺 许家瑞 

机构地区：[1]Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, China [2]Key Laboratory of Designed Synthesis and Application of Polymer Material, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275

出　　处：《Chinese Journal of Chemistry》2011年第5期1036-1040,共5页中国化学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Nos. 50903096 and 50873116） and the Natural Science Fundation of Guangdong Province （No. 9451027501002566）.

摘　　要：A series of polyureas were synthesized through the reaction of aniline trimer with toluene-diisocyanate, diphenylmethane-4,4＇-diisocyanate, and hexamethylene-l,6-diisocyanate, respectively. The chemical structure of these polyureas was characterized and verified by FT-IR, ^1H NMR, elemental analysis, UV, XRD and CV. The conductivity of these polyureas ranged from 10^-7 to 10^-6 S/cm measured by four-point-probe instrument. Compared to the standalone aniline trimer, the stability （thermal stability and electrochemical stability）, response range and sensitivity of these polyureas are enhanced. The sensitivity of these polyureas DMF solution to pH value is superior to that of the standalone aniline trimer. The color of the polyureas DMF solution is greatly depended on pH value and the color change process is reversible, whenever from base to acid or from acid to base. These enhance- ments may give these polyureas more opportunities in order to be used as sensor materials.A series of polyureas were synthesized through the reaction of aniline trimer with toluene-diisocyanate, diphenylmethane-4,4＇-diisocyanate, and hexamethylene-l,6-diisocyanate, respectively. The chemical structure of these polyureas was characterized and verified by FT-IR, ^1H NMR, elemental analysis, UV, XRD and CV. The conductivity of these polyureas ranged from 10^-7 to 10^-6 S/cm measured by four-point-probe instrument. Compared to the standalone aniline trimer, the stability （thermal stability and electrochemical stability）, response range and sensitivity of these polyureas are enhanced. The sensitivity of these polyureas DMF solution to pH value is superior to that of the standalone aniline trimer. The color of the polyureas DMF solution is greatly depended on pH value and the color change process is reversible, whenever from base to acid or from acid to base. These enhance- ments may give these polyureas more opportunities in order to be used as sensor materials.

关 键 词：sensor copolymerization POLYUREA OLIGOMER OLIGOANILINE 

分 类 号：TQ153.12[化学工程—电化学工业] TQ630.493