Xu Mingzhen, Zhang Jiaqu, Li Bo, Fan Zexu, He Lunshuai
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.
Molecules. 2024 Nov 28;29(23):5637. doi: 10.3390/molecules29235637.
Phthalonitrile-based resins and benzoxazine play important roles in the field of advanced materials because of their excellent properties. In order to understand the effect of the backbone's structure on the curing kinetics and properties of the multifunctional resin matrices, different kinds of phthalonitrile containing benzoxazine with various backbone structures were designed and prepared. The curing processes and curing behaviors were investigated by differential scanning calorimetry (DSC). With the assistance of the orthogonal test analysis method, the kinetic parameters, including activation energy , were evaluated and calculated. Results indicated that an autocatalytic model for the curing reaction of various phthalonitrile-containing benzoxazine resins was confirmed. Nevertheless, the activation energies for reactions of benzoxazine and nitrile groups were significantly changed due to the steric hindrance derived from the backbone's structures. The thermal stability of polymers cured at various temperatures was evaluated by TGA testing. Then, their mechanical properties were investigated and confirmed with SEM images of fracture surfaces. Also, the thermal expansion characteristics of the various polymers were investigated. Results demonstrated that this work proposed an improved matrix resin system with outstanding thermal stability and mechanical properties that broadened the foundation and ideas for subsequent research.
基于邻苯二甲腈的树脂和苯并恶嗪因其优异的性能在先进材料领域发挥着重要作用。为了了解主链结构对多功能树脂基体固化动力学和性能的影响，设计并制备了具有不同主链结构的含苯并恶嗪的不同种类邻苯二甲腈。通过差示扫描量热法（DSC）研究了固化过程和固化行为。借助正交试验分析方法，评估并计算了包括活化能在内的动力学参数。结果表明，证实了各种含邻苯二甲腈的苯并恶嗪树脂固化反应的自催化模型。然而，由于主链结构产生的空间位阻，苯并恶嗪和腈基反应的活化能发生了显著变化。通过热重分析（TGA）测试评估了在不同温度下固化的聚合物的热稳定性。然后，研究了它们的力学性能，并用断裂表面的扫描电子显微镜（SEM）图像进行了证实。此外，还研究了各种聚合物的热膨胀特性。结果表明，这项工作提出了一种具有出色热稳定性和力学性能的改进基体树脂体系，拓宽了后续研究的基础和思路。
