Preparation and Characterization of Aromatic Polybenzoxazoles Copolymers Containing 2,6-Naphthalene Units  

作　　者：LILei ZHAOXiao-dong ZHOUJing-lun CHENXiao-fang WANXin-hua ZHOUQi-feng 

机构地区：[1]DepartmentofPolymerScienceandEngineering,CollegeofChemistryandMolecularEngineering,PekingUniversity,Beijing100871,P.R.China

出　　处：《Chemical Research in Chinese Universities》2004年第5期652-655,共4页高等学校化学研究（英文版）

基　　金：Supportby the"86 3"Program(No. 2 0 0 1AA335 0 5 0 ) and the"973"Program(No. 2 0 0 3CB6 15 6 0 0 ) of the People's Re-public of China

摘　　要：A series of polybenzoxazoles(co)polymers bearing crankshaft units in the main chain was synthesized by the conventional solution polycondensation of 4,6-diaminorescinol dihydrochloride, terephthalic acid(TA) and 2,6-naphthalene dicarboxylic acid(NDA). All of the polymers show lyotropic liquid crystal behavior in polyphosphoric acid(PPA) and methanesulfonic acid(MSA). The polybenzoxazoles exhibit an excellent thermal resistance although the crankshaft monomer has been introduced into the polymer backbone. The temperature for the 5% weight loss of all the polymers is above 600 ℃.The X-ray diffraction analysis results show that the series of the polymers has a high crystallinity. The introduction of NDA makes a slight decrease in the thermal resistance of the polymers. The maximum absorption peak in the UV-Vis spectra can be adjusted according to the amount of 2,6-naphthalene units in the polymers, which indicates the potential application of the polymers as optoelectric materials.A series of polybenzoxazoles(co)polymers bearing crankshaft units in the main chain was synthesized by the conventional solution polycondensation of 4,6-diaminorescinol dihydrochloride, terephthalic acid(TA) and 2,6-naphthalene dicarboxylic acid(NDA). All of the polymers show lyotropic liquid crystal behavior in polyphosphoric acid(PPA) and methanesulfonic acid(MSA). The polybenzoxazoles exhibit an excellent thermal resistance although the crankshaft monomer has been introduced into the polymer backbone. The temperature for the 5% weight loss of all the polymers is above 600 ℃.The X-ray diffraction analysis results show that the series of the polymers has a high crystallinity. The introduction of NDA makes a slight decrease in the thermal resistance of the polymers. The maximum absorption peak in the UV-Vis spectra can be adjusted according to the amount of 2,6-naphthalene units in the polymers, which indicates the potential application of the polymers as optoelectric materials.

关 键 词：POLYBENZOXAZOLES COPOLYMER Liquid crystal Thermal resistance 

分 类 号：O632.7[理学—高分子化学]