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ISSN : 1225-0112(Print)
ISSN : 2288-4505(Online)
Applied Chemistry for Engineering Vol.10 No.7 pp.979-984
DOI :

RESEARCH PAPERS : The Change of Properties and Synthesis of Soluble Polyimides Based on 2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane

Han Sung Kim

Abstract

Aromatic soluble polyimides were synthesized from 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane and various dianhydrides such as pyromelltic dianhydride(PMDA), 3,3'',4,4''-benzophenone tetracarboxylic dianhydride(BTDA), and 4,4''-(hexafluoroisopropylidene)-bis(phthalic anhydride)(6FDA). Polyimides prepared by themal imidization were insoluble in common organic solvents (acetone, MNP, DMAc, DMSO, THF, and DMF) but those prepared by chemical imidization were soluble. The difference of solubility was explained by esterification between hydroxyl group and CH3COO-from acetic anhydride used as a dehydration agent in chemical imidization. Glass transition temperatures of polyimides by thermal method were higher than those by chemical method. All of the polyimides are stable up to 300oC regardless of the sample preparation. The x-ray diffraction patterns showed that all polyimides were amorphrous.

연구논문 : 2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane 을 이용한 용해성 폴리이미드의 합성과 특성변화

김한성,하순효

초록

2,2-Bis(3-amino-4-hydroxyphenyl) hexafluoropropane(BAPAF)과 pyromelltic dianhydride(PMDA), 3,3'''',4,4''''-benzophenontetracarboxylic dianhydride(BTDA), 4,4''''-(hexafluoroisoprorylidene)-bis(phthalic anhydride) (6FDA)을 사용하여 용해성 폴리이드를 합성하였다. 합성된 폴리이미드를 여러가지 유기용제(acetone, NMP, DMAc, DMSO, THF, DMF)를 이용하여 용해성 실험을 행한 결과 열적 이미드화한 경우에는 녹지 않고 팽윤 되었으나 화학적 이미드화한 경우에는 모든 구조가 여러 유기용제에 대해 좋은 용해성을 나타냈다. 이러한 용해도 차이는 화학적 이미드화할 겨우 탈수제로 들어간 acetic anhydride에서 나온 CH3COO-가 하이드록실기와 에스테르 반응을 하여 분자사슬에 결합한데 기인한다. 합성된 폴리이미드의 유리전이온도는 열적 이미드화 경우가 더 높은 값을 나타냈으며 TGA 측정 결과 모든 구조가 300oC 이상까지 열적 안정성을 나타내었다. 합성된 폴리이미드의 결정성은 XRD를 이용하여 조사한 결과 모두 무정형으로 나타났다

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