Synthesis and characterization of organosoluble aromatic copolyimids |
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Authors: | Jintian Yang Wei Huang Yongfeng Zhou Deyue Yan |
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Affiliation: | (1) College of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai, 200240, China;(2) Department of Chemistry, Huzhou Teachers College, Huzhou, 313000, China |
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Abstract: | A series of aromatic copolyimides was successfully synthesized from the commercial pyromellitic dianhydride (PMDA) with a commercial diamine p-phenyldiamine (PDA) and a diamine 4,4′-methylenebis-(2-tert-butylaniline) (MBTBA) specially designed by the authors. The copolyimides were characterized by Infra-red (IR), Nuclear Magnetic Resonance (NMR), Gel Permeation Chromatography (GPC), Ultraviolet Visual (UV-Vis), Thermogravimetic Analysis (TGA) and Dynamic Mechanical Analysis (DMA). The copolyimide was precipitated in m-cresol in the polymerization process when the molar ratio of MBTBA and PDA was lower than 6/4. The number-average molecular weight of the soluble copolyimides measured by GPC was larger than 4.0 × 104, and the polydispersity index was higher than 1.5. Only one glass transition temperature of these copolyimides was detected around 360°C by DMA. The copolyimides did not show appreciable decomposition up to 500°C under N2, and the thermal stability of the copolyimide increased a little with the introduction of PDA into the polyimide main chain. Translated from Acta Polymerica Sinica, 2006, (4): 609–614 (in Chinese) |
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Keywords: | polyimide copolycondensation PMDA MBT-BA PDA |
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