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Issue
Korean Journal of Chemical Engineering,
Vol.32, No.2, 362-368, 2015
Synthesis and thermal properties of polyimides containing azomethine linkage for processable high-performance engineering plastics
Iqbal R, Khosa MK, Jamal MA, Hamid M
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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[Cited By]
  1. Shi G, Che Y, Wu L, Rong Y, Ni C, Korean Journal of Chemical Engineering, 34(2), 470, 2017
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