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

高等学校化学研究 ›› 2004, Vol. 20 ›› Issue (5): 652-655.

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

LI Lei, FAN Xing-he, ZHAO Xiao-dong, ZHOU Jing-lun, CHEN Xiao-fang, WAN Xin-hua, ZHOU Qi-feng

Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

收稿日期:2003-07-20 出版日期:2004-10-24 发布日期:2011-08-06
基金资助:
Support by the "863" Program(No.2001AA335050) and the "973" Program(No.2003CB615600) of the People's Republic of China.

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

LI Lei, FAN Xing-he, ZHAO Xiao-dong, ZHOU Jing-lun, CHEN Xiao-fang, WAN Xin-hua, ZHOU Qi-feng

Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received:2003-07-20 Online:2004-10-24 Published:2011-08-06
Supported by:
Support by the "863" Program(No.2001AA335050) and the "973" Program(No.2003CB615600) of the People's Republic of China.

摘要/Abstract

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.

关键词: Polybenzoxazoles, Copolymer, Liquid crystal, Thermal resistance

Abstract: 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.

Key words: Polybenzoxazoles, Copolymer, Liquid crystal, Thermal resistance

LI Lei, FAN Xing-he, ZHAO Xiao-dong, ZHOU Jing-lun, CHEN Xiao-fang, WAN Xin-hua, ZHOU Qi-feng. Preparation and Characterization of Aromatic Polybenzoxazoles Copolymers Containing 2,6-Naphthalene Units[J]. 高等学校化学研究, 2004, 20(5): 652-655.

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

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

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