基于VARTM的竹长纤维/环氧树脂复合材料的成型机制及性能调控

本项目以竹资源的高值利用技术需求为导向，针对天然纤维增强热固性树脂复合材料成型过程中浸渍效果差、制品结构不均匀、成型效率低的共性科学问题，重点围绕竹长纤维/环氧树脂复合材料的真空辅助树脂传递模塑（VARTM）成型机制及性能调控，通过考察树脂体系的流变学性质和固化动力学及其性能调控，结合竹长纤维预成型体的结构设计和界面改性，研究成型工艺条件对复合材料力学性能的影响机制。在此基础之上，通过树脂充模过程的数值模拟，分析树脂粘度、真空度及注射压力对充模过程的影响，揭示成型工艺参数与充模时间及压力分布的相关关系；并结合经典层合板理论，构建复合材料性能与成型工艺相关参数之间的数学模型，在综合平衡成型工艺参数与材料性能关系的基础之上，准确掌握成型工艺调控规律，建立并完善复合材料性能调控体系，旨在解决长期影响竹资源高值利用技术瓶颈背后的基础问题，为竹资源产业化利用及其行业的转型升级提供理论依据和技术支撑。

This project focuses on the value-added utilization technology of bamboo fibers. In view of common problems such as poor resin impregnating in fibers, inhomogeneous structure of final products and low effectiveness in processing thermosetting resin-based composites reinforced with natural fibers, the compounding mechanism and performance control of bamboo long fibers/epoxy resin composites via vacuum assisted resin transfer molding (VARTM) are investigated. Through the study of rheological characteristics and curing kinetics of resin system and its property control, as well as interfacial modification and preformed-mat design, the effect of compounding conditions on the properties of the composites will be investigated. In addition, by numerical simulation in process of resin filling mold, the effect of resin viscosity, vacuum, and injection pressure will be analyzed, the correlation between molding parameters and filling time and pressure distribution will be clarified. With the classical lamination theory, a model explaining the relationship between compounding parameters and composite property will be constructed. The regulation of compounding technology will be further revealed, and the system for controllable composite performance will be finally optimized. The final objective of the project is to solve the fundamental problems of technical bottlenecks which have impacted the value-added utilization of bamboo resources, and to provide theoretical basis and technical support for industrialization utilization of bamboo resources and the transition and promotion of bamboo industry.