폴리벤족사졸 전구체를 이용한 새로운 내열성 섬유고분자의 개발(I) -PHA 유도체의 합성과 열고리화- = Preparation of New Heat-resistant Fiber Materials Using Polymeric Precursors to Polybenzoxazoles(I) -Synthesis and Thermal Cyclization of PHA Derivatives -

다국어 초록 (Multilingual Abstract)

Polyhydroxyamides derivatized with alkyl ester groups were investigated as possible candidates for new heat-resistant fiber materials which could be converted to polybenzoxazoles under fire conditions. Model compounds for these polyhydroxyamides were synthesized and their cyclization chemistry was investigated. The model compound study revealed that all the alkyl ester group containing model compounds could cyclize on heating. The rates of cyclization were dependent upon the structures of substituents. The longer and the larger the substituent, the faster was the rate of cyclization. The polyhydroxyamides showed similar results, namely, polyhydroxyamide derivatized with a longer or larger alkyl substituent showed a faster cyclization rate.