SYNTHESIS OF NOVEL SOLUBLE AROMATIC POLYPYROMELLITIMIDE CONTAINING ORDERED 1,2,4-TRIAZINE IN THE MAIN CHAIN

• Published in: Chinese journal of polymer science Vol. 20; no. 3; pp. 219 - 224
• Main Author: Xiao-bing Yi Guo-shi Wu Feng-cai Lu
• Format: Journal Article
• Language: English
• Published: Department of Chemistry, Tsinghua University, Beijing 100084, China%Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China 01.05.2002
• Subjects: 1,2,4-Triazine; group; N,N'-Bis(4-benzil)pyromellitimide; Polyimides; Rigid-rod; Polyimides,N,N'-Bis(4-benzil)pyromellitimide,Rigid-rod group,1,2,4-Triazine
• ISSN: 0256-7679; 1439-6203
• DOI: 10.3321/j.issn:0256-7679.2002.03.005

A new heat-resistant, soluble polymer, poly(phenyl-1,2,4-triazine imidc), has been prepared via a two-step method of polycondensation of N,N'-bis(4-benzil)pyromellitimide and terephthalamidrazone in cresol, followed by curing at higher temperature. The rigid 1,2,4-triazine group increases the solubility of the polyimide so that the polymer is soluble in cresol,N-methyl-2-pyrrolidone (NMP), trifluoroacetic acid and concentrated sulfuric acid, etc. Thermogravimetric analysis (TGA)indicates that this novel polyimide has good thermal stability with a high decomposition temperature of 447℃ in air and of 423 ℃ in N2. It has a tensile strength of 107.4 MPa with an elongation at break of around 7.6%.