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고내열 Polyester-imide Resin의 합성 및 열적 성질
박이순,하기룡,도정회 경북대학교 산업기술연구소 1993 産業技術硏究誌 Vol.21 No.-
Methylene dianiline(MDA)와 trimellitic anhydride (TMA)를 반응시켜 diacid diimide (DID)를 합성하고 이를 과량의 ethyleneglycol과 반응시켜 bishydroxyethylbisimide(BHEI) 중간체를 합성하였다. 다음 dimethylterephthalate와 ethyleneglycol를 에스테르 교환 반응시켜 bishydroxyethyl terephthalate(BHET)중간체를 합성하였고 이를 BHEI와 280℃, 감압(1~3 ㎜Hg)의 용융상태에서 축합 중합하여 polyester-imide를 얻었으며 GPC 및 ^1H-NMR로 분자량 및 공중합체 조성을 구하였다. 생성된 공중합체는 imide단위가 2-10 mole% 함유됨에 따라 PET단독중합체(T_g=78.9℃)보다 내열성(공중합체 T_g=81.9-91.6℃) 이 증가됨을 확인하였다. Methylene dianiline(MDA) was reacted with trimellitic anhydride(TMA) to give diacid diimide(DID) and then DID was reacted with excess of etyleneglycol to give bishydroxyethylbisimide(BHEI) intermediate. Dimethylterephthlate was reacted with ethyleneglycol by ester interchange reaction to give bishydroxyethylterephthalate(BHET) intermediate. BHET and BHEI was cocondensed in the melt state at 280℃ under reduced pressure (1~3 ㎜Hg) to give polyester-imide type copolymer. The molecular weight and composition of copolymer was determined by GPC and ^1H-NMR. The resulting copolymer showed increased thermal stability (T_g=81.9-91.6℃ with imide unite content of 2-10 ㏖%) compared to homopolymer (PET, T_g=78.9℃).