SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE*

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SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE*

Papers | Updated：2021-06-21

- SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE*
- Vol. 22, Issue 4, Pages: 349-353(2004)
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- Published：20 August 2004
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SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE*[J]. 2004, 22(4): 349-353.
DOI：

SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE*[J]. 2004, 22(4): 349-353. DOI：

摘要

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 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

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.

Abstract

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 dihydrochloride (DAR)using pyridine and N

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

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