화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.32, No.2, 362-368, February, 2015
DOI10.1007/s11814-014-0205-1  Export Citation
Synthesis and thermal properties of polyimides containing azomethine linkage for processable high-performance engineering plastics
Rubbia Iqbal, Muhammad Kaleem Khosa†, Muhammad Asghar Jamal, and Mazhar Hamid1
  • Department of Chemistry, Government College University, Faisalabad 38000, Pakistan
  • 1National Engineering and Scientific Commission, P. O. Box 2216, Islamabad, Pakistan
E-mail:
A new series of polyimides having azomethine functionality in backbone was synthesized by two-steps polycondensation method. Five substituted aromatic diamines--N-(4-aminobenzylidene)-2chloro-6-methylbenzene-1,4-diamine (DA1), N-(4-aminobenzylidene)-2-methoxybenzene-1,4-diamine (DA2), N-(4-aminobenzylidene)-2-methylbenzene-1,4-diamine (DA3), N-(4-aminobenzylidene)-3-methylbenzene-1,4-diamine (DA4) and N,(4-aminobenzylidene)-2-hydroxybenzene-1,4-diamine (DA5)--were prepared and condensed with 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) to obtain poly(azomethine imide). All synthesized polyimides PI(1-5) were fully characterized by elemental analyses, FTIR, 1H-NMR, having amorphous nature and are soluble in dmac, dmf, and dmso, m-cresol due to presence of azomethine functionality. The inherent viscosities and moisture absorption of all polyimides lie in the range of 0.65-0.85 dL gm.1 and 0.68-0.82% respectively. Thermal stability was assessed by 10% weight loss temperature and the degradation temperature of the resultant polymers falls in the ranges from 480-535 ℃ in nitrogen. The glass transition temperature was in the range of 225-330 ℃. Due to above mentioned attractive properties, polyimidebased material are attractive for processable high-performance engineering plastics and starting material for fabrication of new polymers.
Keywords:Polyimide;Diamines;Glass Transition Temperature;Schiff Base;Thermal Stability
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