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Synthesis and characterization of poly(2-cyano-1,4-phenylene terephthalamide) and its copolymers by phosphorylation-assisted polycondensation reaction

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Abstract

By using phosphorylation-based polycondensation reaction, poly(2-cyano-1,4-phenylene terephthalamide) (cyPPTA) and its copolymers with different cyano-monomer contents of 50–100 mol% were successfully synthesized from terephthalic acid, 2-cyano-1,4-phenylenediamine, and 1,4-phenylenediamine monomers in N-methyl-2-pyrrolidone/calcium chloride solvent system. The polymer concentration in the organic solvent after the polycondensation reaction was controlled to be 10 wt%. The cyPPTA-based polymers with higher cyano-monomer contents were found to have higher intrinsic viscosity and number-average molecular weight owing to their increased solubility in the polymerization solutions. The polarized optical microscopic images demonstrated that the polymers with high cyano-monomer contents of 100 and 80 mol% developed liquid crystalline structure in the polymerization solutions, while the polymers with relatively low cyano-monomer contents of 50–70 mol% formed highly condensed crystalline morphology. Consistently, the FT-IR spectra and X-ray diffraction patterns exhibited that the cyPPTA-based polymers with high cyano-monomer contents above 80 mol% have relatively week interchain hydrogen bond and thus form semi-ordered structures, in comparison with the polymer products with low cyano-monomer contents less than 70 mol%. In addition, the cyPPTAs with higher cyano-monomer contents were found to have higher thermal decomposition peak temperatures.

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Authors and Affiliations

  1. Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon, 305-764, Korea

    Seong Jun Yu, Doo Hyun Baik & Young Gyu Jeong

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  1. Seong Jun Yu
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  2. Doo Hyun Baik
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  3. Young Gyu Jeong
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Correspondence to Young Gyu Jeong.

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Yu, S.J., Baik, D.H. & Jeong, Y.G. Synthesis and characterization of poly(2-cyano-1,4-phenylene terephthalamide) and its copolymers by phosphorylation-assisted polycondensation reaction. Fibers Polym 15, 2447–2452 (2014). https://doi.org/10.1007/s12221-014-2447-2

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  • DOI: https://doi.org/10.1007/s12221-014-2447-2

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