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<p>Poly (m-phenylene isophthalamide) (PMIA) is a highly significant aromatic polyamide known for its excellent mechanical strength, high thermal stability, chemical resistance, and electrical insulating properties. PMIA finds extensive applications in areas such as filtration membranes, electronic device separators, fire-resistant textiles, and high-performance composites. In this study, PMIA was synthesized via interfacial polycondensation between m-phenylenediamine (MPD) dissolved in water and isophthaloyl chloride (IPC) dissolved in tetrahydrofuran (THF). The effects of key reaction parameters, including temperature, reaction time, stirring rate, monomer concentration and ratio, acid acceptor, and solvent type, on the intrinsic viscosity and yield of PMIA were systematically investigated. Optimized conditions yielded PMIA with a high molecular weight, evidenced by an intrinsic viscosity of 2.1 dL/g and an excellent yield of 99.7%. The resulting polymer demonstrated a tensile strength of 25&#xa0;MPa, an initial degradation temperature of 440&#xa0;°C, and a dielectric constant of 3.44 at 1&#xa0;Hz. These results confirm that PMIA synthesized by interfacial polycondensation possesses outstanding thermal resistance, mechanical performance, and electrical properties, making it highly attractive for advanced material applications. These results establish a route to tailor high-performance PMIA via interfacial polycondensation, with potential for scalable applications in advanced electronics and insulation technologies.</p>

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Interfacial polymerization of poly (m-phenylene isophthalamide): synthesis, optimization, and performance evaluation for high-temperature insulation and flexible membranes

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • M. Abdelaty,
  • Zhu Huanhuan,
  • Zhao Yun,
  • Jiao Qingze

摘要

Poly (m-phenylene isophthalamide) (PMIA) is a highly significant aromatic polyamide known for its excellent mechanical strength, high thermal stability, chemical resistance, and electrical insulating properties. PMIA finds extensive applications in areas such as filtration membranes, electronic device separators, fire-resistant textiles, and high-performance composites. In this study, PMIA was synthesized via interfacial polycondensation between m-phenylenediamine (MPD) dissolved in water and isophthaloyl chloride (IPC) dissolved in tetrahydrofuran (THF). The effects of key reaction parameters, including temperature, reaction time, stirring rate, monomer concentration and ratio, acid acceptor, and solvent type, on the intrinsic viscosity and yield of PMIA were systematically investigated. Optimized conditions yielded PMIA with a high molecular weight, evidenced by an intrinsic viscosity of 2.1 dL/g and an excellent yield of 99.7%. The resulting polymer demonstrated a tensile strength of 25 MPa, an initial degradation temperature of 440 °C, and a dielectric constant of 3.44 at 1 Hz. These results confirm that PMIA synthesized by interfacial polycondensation possesses outstanding thermal resistance, mechanical performance, and electrical properties, making it highly attractive for advanced material applications. These results establish a route to tailor high-performance PMIA via interfacial polycondensation, with potential for scalable applications in advanced electronics and insulation technologies.