Kang, N.; Yang, S.; Xiong, X.; Han, A.; Ren, R.; Wang, J. The Performance and Synthesis of Alkynyl−Functionalized Benzoxazine Containing Phthalide Side Groups and Cyano Groups with Different Molecular Weights. Polymers2023, 15, 3478.
Kang, N.; Yang, S.; Xiong, X.; Han, A.; Ren, R.; Wang, J. The Performance and Synthesis of Alkynyl−Functionalized Benzoxazine Containing Phthalide Side Groups and Cyano Groups with Different Molecular Weights. Polymers 2023, 15, 3478.
Kang, N.; Yang, S.; Xiong, X.; Han, A.; Ren, R.; Wang, J. The Performance and Synthesis of Alkynyl−Functionalized Benzoxazine Containing Phthalide Side Groups and Cyano Groups with Different Molecular Weights. Polymers2023, 15, 3478.
Kang, N.; Yang, S.; Xiong, X.; Han, A.; Ren, R.; Wang, J. The Performance and Synthesis of Alkynyl−Functionalized Benzoxazine Containing Phthalide Side Groups and Cyano Groups with Different Molecular Weights. Polymers 2023, 15, 3478.
Abstract
Abstract: Because of outstanding heat resistance and processing qualities, benzoxazine resins are widely employed in a variety of applications. However, traditional benzoxazine resins still confront hurdles in today's engineering applications, such as can’t long-term service in high-temperature settings and inadequate toughness. Four alkyne-functionalized benzoxazines with phthalide side group and cyano group of varying molecular weights were produced in this study. Fourier trans-form infrared spectroscopy (FT-IR) and hydrogen nuclear magnetic resonance spectroscopy ( 1H-NMR ) were used to characterize the resin structure, and differential scanning calorimetry (DSC) was used to investigate the thermal curing kinetics at different warming rates, the apparent activation energy was 116.9 kJ/mol. In-situ FTIR was used to investigate the cure mechanism. Dynamic mechanical analysis (DMA) was used to evaluate the gelationation time of BOZ series resins at various temperatures, and the curing process was designed by combined the results of DSC. The Tg of the composites made using BOZ-1N21 as the matrix was 336°C, which was much higher than the Tg of the BP-a resin made with aniline, phenolphthalein, and formaldehyde (Tg=251°C). As a result, the resin system is expected to be employed in applications requiring high-temperature resistance and toughness.
Keywords
Benzoxazine; Alkynyl; Curing mechanism; Cyano group
Subject
Chemistry and Materials Science, Materials Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
