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Synthesis and characterization of polyamides and poly(amide-imide)s based on ether-sulfone-diamines

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Abstract

A series of polyamides and poly(amide-imide)s were prepared by the direct polycondensation of 4,4′-[sulfonylbis(1,4-phenyleneoxy)]dianiline or 4,4′-[sulfonylbis(2,6-dimethyl-1,4-phenyleneoxy)]dianiline with aromatic dicarboxylic acids and phthalimide unit-bearing dicarboxylic acids in a N-methyl-2-pyrrolidone (NMP) solution containing dissolved calcium chloride using triphenyl phosphite and pyridine as condensing agents. The inherent viscosities of the resulting polymers were above 0.45 dL/g and up to 1.70 dL/g. Except for the polyamides derived from terephthalic acid and 4,4′-biphenyldicarboxylic acid, all the other polyamides and all poly(amide-imide)s were readily soluble in polar organic solvents such as NMP, N, N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and m-cresol, and afforded transparent and tough films by solution-casting. Most of the polymers showed distinct glass transition on their differential scanning calorimetry (DSC) traces and their glass transition temperatures (Tg) stayed between 140–264 °C. The methyl-substituted polymers showed higher Tgs than the corresponding unsubstituted counterparts. The results of the thermogravimetry analysis (TGA) revealed that all the methyl-substituted polymers showed lower initial decomposition temperatures than the unsubstituted ones.

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Authors and Affiliations

  1. Department of Chemical Engineering, Tatung Institute of Technology, 40 Chungshan North Rd., Sec.3, Taipei, 10451, Taiwan, ROC

    Sheng-Huei Hsiao, Chin-Ping Yang & Chin-Tang Li

Authors
  1. Sheng-Huei Hsiao
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  2. Chin-Ping Yang
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  3. Chin-Tang Li
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Correspondence to Sheng-Huei Hsiao.

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Hsiao, SH., Yang, CP. & Li, CT. Synthesis and characterization of polyamides and poly(amide-imide)s based on ether-sulfone-diamines. J Polym Res 5, 243–248 (1998). https://doi.org/10.1007/s10965-006-0063-6

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  • DOI: https://doi.org/10.1007/s10965-006-0063-6

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