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<p>Polybenzoxazines, a new type of high-performance thermosetting resin, have attracted significant interest. A bio-based 1,5-pentylenediamine was used to synthesize two benzoxazines (abbreviated as PH-p and PTB-p). Their chemical structures were characterized by Fourier transform infrared spectroscopy (FTIR) spectra and <sup>1</sup>H nuclear magnetic resonance (<sup>1</sup>H NMR) spectra. The curing behaviors were studied by differential scanning calorimetry (DSC), and the kinetics research were analyzed by the Kissinger, Ozawa, Starink, and Friedman methods. The curing kinetics indicated lower activation energies for both monomers, 75.34 (PH-p) and 81.66 (PTB-p) kJ/mol, respectively. Moreover, the thermal properties of these two polybenzoxazines, poly(PH-p) and poly(PTB-p), were investigated by dynamic thermomechanical analysis (DMA) and thermogravimetric analysis (TGA). The high glass transition temperatures (T<sub>g</sub>) of 200 and 173&#xa0;℃ can be obtained, respectively. In addition, both polybenzoxazines exhibit hydrophobicity with low surface free energy (SFE) of 30.76 and 21.16&#xa0;mJ/m<sup>2</sup>, respectively. Furthermore, their dielectric properties were tested, and dielectric constant and dielectric loss of poly(PTB-p) at 1&#xa0;MHz were as low as 2.44 and 0.004, respectively. Therefore, this work provides a new insight for the sustainable production of high-performance polymers.</p> Graphical abstract <p></p>

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Properties of polybenzoxazines derived from bio-based diamine: low dielectric constant and high heat resistance

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Haidong Chen,
  • Junbo Yao,
  • Tongan Bu,
  • Ximeng Wu,
  • Qichao Ran

摘要

Polybenzoxazines, a new type of high-performance thermosetting resin, have attracted significant interest. A bio-based 1,5-pentylenediamine was used to synthesize two benzoxazines (abbreviated as PH-p and PTB-p). Their chemical structures were characterized by Fourier transform infrared spectroscopy (FTIR) spectra and 1H nuclear magnetic resonance (1H NMR) spectra. The curing behaviors were studied by differential scanning calorimetry (DSC), and the kinetics research were analyzed by the Kissinger, Ozawa, Starink, and Friedman methods. The curing kinetics indicated lower activation energies for both monomers, 75.34 (PH-p) and 81.66 (PTB-p) kJ/mol, respectively. Moreover, the thermal properties of these two polybenzoxazines, poly(PH-p) and poly(PTB-p), were investigated by dynamic thermomechanical analysis (DMA) and thermogravimetric analysis (TGA). The high glass transition temperatures (Tg) of 200 and 173 ℃ can be obtained, respectively. In addition, both polybenzoxazines exhibit hydrophobicity with low surface free energy (SFE) of 30.76 and 21.16 mJ/m2, respectively. Furthermore, their dielectric properties were tested, and dielectric constant and dielectric loss of poly(PTB-p) at 1 MHz were as low as 2.44 and 0.004, respectively. Therefore, this work provides a new insight for the sustainable production of high-performance polymers.

Graphical abstract