Aromatic Polypyromellitimides were Prepared in two steps. Pyromellitic dianh ydride was added to the solution of an aromatic diamine in aprotic polar solvent, DMF. The reaction was conducted to obtain a viscous prepolymer, and the prepolymer was converted to insoluble polyimide by means of thermal method. Used aromatic diamines were 3,3''-diaminodiphenylether, 3,4''-diaminodiphenylether, 4,4''-diaminodiphenylether, m -phenylenediamine, and p-phenylenediamine. The 5 polypromellitimides prepared from the above diamines were investigated for solublity and thermal stability. These polymers were found to have the activation energies of thermal degradation in the range from 38 to 67 Kcal/mol.

두 개의 페닐렌기 사이에 에테르기가 3,3''-, 3,4''- 및 4,4''-의 위치로 연결된 것과 에테르 연결기 없이 m-나 p-위치로 연결된 벤젠고리만을 갖는 5개의 디아민류를 준비하였고, 이들 5가지 디아민 단량체와 피로멜리트이무수산을 이단계 저온 용액중합에 의해 폴리피로멜리트이미드를 합성하였다. 그결과 합성된 5가지 종류의 중합체의 구조와 이들의 열적안정성, 열분해 활성화에너지 및 용해성등의 성질에 관하여 서로 비교하고 연구하였다.