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<p>MXD6 (poly(m-xylylene adipamide)), as a semi-aromatic polyamide, is extensively utilized in packaging, automotive, and unmanned aerial vehicle fields. High strength and heat resistance are very important properties for an engineering plastic. To enhance the thermal and mechanical properties of MXD6, in this study, we investigated the influence of aromatic dicarboxylic acids on its copolymerization. MXD6 and its copolymer derivatives were synthesized via a one-pot synthesis method, which only takes six and a half hours, and the chemical structures of the resulting copolymers were characterized using Fourier transform infrared (FTIR) spectroscopy. X-ray diffraction (XRD) test results indicated that the crystallinity gradually decreased with the introduction of MXDT and MXDI segments. Differential scanning calorimetry (DSC) results demonstrated that the incorporation of copoly(aromatic dicarboxylic acid) segments led to an increase in the glass transition temperature (Tg). Specifically, the Tg of the samples containing 10% MXDT and MXDI segments rose from 77.6&#xa0;°C to 91.4&#xa0;°C and 82.4&#xa0;°C, respectively. Thermogravimetric analysis (TGA) results indicated that the copolymer aromatic dicarboxylic acid would lower the initial decomposition temperature, but expand the decomposition temperature range. The results of the heat distortion temperature (HDT) test showed that the introduction of MXDT and MXDI segments would increase the heat distortion temperature of MXD6, and the increase was more obvious when MXDT segments were introduced compared to MXDI segments. Specifically, when the content of MXDT segments reaches 20%, the heat deflection temperature of MXD6‑T reaches 80.5&#xa0;°C, which represents an increase of 13.3&#xa0;°C relative to that of the pristine MXD6 sample. The mechanical property test results indicated that the tensile and flexural properties presented a trend of increasing first and then decreasing, and the introduction of 10% aromatic dicarboxylic acid was the best, while the impact performance decreased. The findings confirm that the inclusion of aromatic dicarboxylic acid segments enhances the heat resistance performance of MXD6. The copolymer with 10% aromatic dicarboxylic acid content shows optimal mechanical performance, establishing this formulation as the most effective. Owing to the fact that this study involved only two types of aromatic dicarboxylic acids in the copolymerization, the aforementioned conclusions are consequently of a relative and context-dependent nature.</p>

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The influence of copolymerization of MXD6 with aromatic Dibasic acids on thermal and mechanical properties

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Hongjiao Li,
  • Xiuling Cao,
  • Yufeng Tan,
  • Lingyu Li,
  • Zhenzhen Tan,
  • Jiachun Zhong,
  • Zejun Pu

摘要

MXD6 (poly(m-xylylene adipamide)), as a semi-aromatic polyamide, is extensively utilized in packaging, automotive, and unmanned aerial vehicle fields. High strength and heat resistance are very important properties for an engineering plastic. To enhance the thermal and mechanical properties of MXD6, in this study, we investigated the influence of aromatic dicarboxylic acids on its copolymerization. MXD6 and its copolymer derivatives were synthesized via a one-pot synthesis method, which only takes six and a half hours, and the chemical structures of the resulting copolymers were characterized using Fourier transform infrared (FTIR) spectroscopy. X-ray diffraction (XRD) test results indicated that the crystallinity gradually decreased with the introduction of MXDT and MXDI segments. Differential scanning calorimetry (DSC) results demonstrated that the incorporation of copoly(aromatic dicarboxylic acid) segments led to an increase in the glass transition temperature (Tg). Specifically, the Tg of the samples containing 10% MXDT and MXDI segments rose from 77.6 °C to 91.4 °C and 82.4 °C, respectively. Thermogravimetric analysis (TGA) results indicated that the copolymer aromatic dicarboxylic acid would lower the initial decomposition temperature, but expand the decomposition temperature range. The results of the heat distortion temperature (HDT) test showed that the introduction of MXDT and MXDI segments would increase the heat distortion temperature of MXD6, and the increase was more obvious when MXDT segments were introduced compared to MXDI segments. Specifically, when the content of MXDT segments reaches 20%, the heat deflection temperature of MXD6‑T reaches 80.5 °C, which represents an increase of 13.3 °C relative to that of the pristine MXD6 sample. The mechanical property test results indicated that the tensile and flexural properties presented a trend of increasing first and then decreasing, and the introduction of 10% aromatic dicarboxylic acid was the best, while the impact performance decreased. The findings confirm that the inclusion of aromatic dicarboxylic acid segments enhances the heat resistance performance of MXD6. The copolymer with 10% aromatic dicarboxylic acid content shows optimal mechanical performance, establishing this formulation as the most effective. Owing to the fact that this study involved only two types of aromatic dicarboxylic acids in the copolymerization, the aforementioned conclusions are consequently of a relative and context-dependent nature.