| SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE |
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| 作者姓名： | LeiLi Xiao-dongZhao Jing-lunZhou Xing-heFan Xiao-fangChen Xin-huaWan Qi-fengZhou |
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| 作者单位： | DepartmentofPolymerScienceandEngineering,CollegeofChemistryandMolecularEngineering,PekingUniversity,Beo＇ing100871,China |
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| 基金项目： | 国家高技术研究发展计划(863计划)
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国家重点基础研究发展计划(973计划) |
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| 摘 要： | Aromatic polybenzoxazole (PBO) precursor, hydroxy-substituted polyenaminonitrile, was prepared by direct polycondensation of 1,4-bis(l-chloro-2,2-dicyanovinyl)benzene (CCB) and 4,6-diaminoresorcinol dihydrochloride (DAR) using pyridine and N,N-dimethylacetamide as condensing agent and solvent. The precursor has good solubility in polar aprotic solvent which is due to the strong dipolar nature of the main chain. The soluble precursor was subjected to thermal cyclization in an inert atmosphere to convert it into the corresponding PBO, which has its 5% weight loss temperature at 540℃ The fully cyclized PBO were characterized by FT-IR and TGA. The introduction of 10% mol 1,3,5-benzenetricarboxylic chloride (BTC) into the main chain not only has little effect on the solubility of PBO precursor but also raises its 5% weight loss temperature to 552℃ and char yield at 700℃ for the cyclized PBO with BTC.
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| 关 键 词： | 合成 热学性质 聚苯并唑 羟基取代聚烯胺腈 前体 环化作用 |
| 收稿时间： | 2003-04-01 |
| 修稿时间： | 2003-06-23 |
SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE* |
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| LeiLi Xiao-dongZhao Jing-lunZhou Xing-heFan Xiao-fangChen Xin-huaWan Qi-fengZhou.SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE[J].Chinese Journal of Polymer Science,2004,0(4):349-353. |
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| Authors: | Lei Li Xiao-dong Zhao Jing-lun Zhou Xing-he Fan Xiao-fang Chen Xin-hua Wan Qi-feng Zhou |
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| Institution: | Department of Polymer Science and Engineering; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871; China |
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| Abstract: | Aromatic polybenzoxazole (PBO) precursor, hydroxy-substituted polyenaminonitrile, was prepared by direct polycondensation of 1,4-bis(1-chloro-2,2-dicyanovinyl)benzene (CCB) and 4,6-diaminoresorcinol dihydrochioride (DAR)using pyridine and N,N-dimethylacetamide as condensing agent and solvent. The precursor has good solubility in polar aprotic solvent which is due to the strong dipolar nature of the main chain. The soluble precursor was subjected to thermal cyclization in an inert atmosphere to convert it into the corresponding PBO, which has its 5% weight loss temperature at 540 ℃. The fully cyclized PBO were characterized by FT-IR and TGA. The introduction of 10% mol 1,3,5-benzenetricarboxylic chloride (BTC) into the main chain not only has little effect on the solubility of PBO precursor but also raises its 5% weight loss temperature to 552℃ and char yield at 700℃ for the cyclized PBO with BTC. |
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| Keywords: | Polybenzoxazole Precursor Hydroxy-substituted Polyenaminonitrile Cyclization PRECURSOR POLYBENZOXAZOLE THERMAL PROPERTIES characterized yield little effect chloride introduction weight loss temperature thermal cyclization inert atmosphere good solubility polar strong nature of |
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