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Received May 16, 2014
Accepted July 17, 2014
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Synthesis and thermal properties of polyimides containing azomethine linkage for processable high-performance engineering plastics
Department of Chemistry, Government College University, Faisalabad 38000, Pakistan 1National Engineering and Scientific Commission, P. O. Box 2216, Islamabad, Pakistan
Korean Journal of Chemical Engineering, February 2015, 32(2), 362-368(7), 10.1007/s11814-014-0205-1
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Abstract
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_x000D_
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.
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