Xu Mingzhen, He Lunshuai, Zhang Jiaqu, Fan Zexu, Li Bo
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.
Materials (Basel). 2024 Dec 17;17(24):6167. doi: 10.3390/ma17246167.
Benzoxazine and o-phthalonitrile resin are two of the most eminent polymer matrices within high-performance fiber-reinforced resin-based composite materials. Studying the influence modalities of their structures and forming processes on performance can furnish a theoretical basis for the design and manufacturing of superior performance composite materials. In this study, we initially incorporated a fluorene structure into the molecular main chain through molecular design to prepare a fluorene-containing benzoxazine nitrile-based resin. The polymerization reaction behavior and process of this resin were monitored meticulously using differential scanning calorimetry and infrared spectroscopy. Meanwhile, by manipulating the pre-polymerization reaction conditions, the impact of the pre-polymerization reaction on the polymerization behavior of the resin monomer was investigated, respectively. Subsequently, diverse glass fiber-reinforced resin-based composite materials were fabricated via hot-pressing in combination with a programmed temperature rise process. Through the characterization of structural strength and thermomechanical properties, it was found that the composite laminates all manifested outstanding bending strength (~600 MPa) and modulus (>30 GPa). Nevertheless, with the elevation of the post-curing temperature, the structural strength and modulus of the composite materials displayed distinct variation laws. This study also discussed the variation laws of the thermal properties of the composite materials by analyzing the glass transition temperature and crosslinking density. Additionally, the interface bonding effect between the glass fiber and the resin matrix was deliberated through the analysis of the cross-sectional morphology of the composite laminates. The results demonstrated that this work proposes an improved matrix resin system with outstanding thermal stability and mechanical properties that broadens the foundation and ideas for subsequent research.
苯并恶嗪和邻苯二甲腈树脂是高性能纤维增强树脂基复合材料中两种最杰出的聚合物基体。研究它们的结构和成型工艺对性能的影响方式可为高性能复合材料的设计和制造提供理论依据。在本研究中，我们首先通过分子设计将芴结构引入分子主链，制备了含芴苯并恶嗪腈基树脂。使用差示扫描量热法和红外光谱对该树脂的聚合反应行为和过程进行了细致监测。同时，通过控制预聚合反应条件，分别研究了预聚合反应对树脂单体聚合行为的影响。随后，通过热压结合程序升温工艺制备了多种玻璃纤维增强树脂基复合材料。通过对结构强度和热机械性能的表征发现，复合层压板均表现出优异的弯曲强度（约600MPa）和模量（>30GPa）。然而，随着后固化温度的升高，复合材料的结构强度和模量呈现出不同的变化规律。本研究还通过分析玻璃化转变温度和交联密度讨论了复合材料热性能的变化规律。此外，通过对复合层压板横截面形态的分析，探讨了玻璃纤维与树脂基体之间的界面粘结效果。结果表明，这项工作提出了一种具有优异热稳定性和机械性能的改进基体树脂体系，拓宽了后续研究的基础和思路。
