光、热、水、载荷的耦合作用下木塑复合材料性能损耗的机理研究

项目面向贵州省林业资源特点和产业发展需求，利用盛产、廉价的马尾松和杉木加工废料增强热塑性树脂制备木塑复合材料(WPCs)。而WPCs在户外易老化，阻碍其拓展应用，且实验室老化条件与复杂的自然环境间存在差异，关键因素(光、热、水、载荷)对WPCs老化的耦合作用尚不明确。申请者在WPCs物理、力学和蠕变性能的前期研究基础上，采用自主知识产权的木质材料老化试验架，进一步围绕WPCs老化机理展开应用基础研究。借助静态和动态力学、表面元素分析、微观形貌观察等手段深入研究WPCs在贵州省特殊气候下的老化失效特点；重点阐明多因素耦合作用下，光、热、水、载荷影响WPCs性能损耗的主次关系；定量表征各因素的贡献率；构建WPCs力学性能损耗和损伤破坏模型；缩短试验研究和实际应用的距离。研究为WPCs产品使用安全性与寿命的评价及应用方向的定位提供参考，也为贵州省林业废弃资源利用提供有效途径，具有经济和社会效益。

Oriented to the characteristics of forestry resources and industrial development needs of Guizhou province, abundant and inexpensive processing residues from Pinus massoniana and Cunninghamia lanceolate will be used to prepare WPCs with thermoplastic resin. However, in the process of outdoor use, the aging performance of WPCs is an obstacle to its expansion. There are differences between laboratory aging conditions and the complex natural environment. And the coupling of key factors (light, heat, water, load) on the aging of WPCs is unclear. Based on the preliminary research on the physical, mechanical and creep properties of WPCs, the aging mechanism of WPCs will be further studied with independent intellectual property rights (Aging Test Rack for Wood Materials). By means of static and dynamic mechanics, surface element analysis and micromorphology observations, aging mechanism of WPCs in special climate of Guizhou province will be explored in depth. The primary and secondary effects of the key factors on the performance loss of WPCs under the action of multiple factors will be analyzed. The contribution rate of each factor will be quantitatively characterized. Mechanical properties loss models and mechanical damage models of WPCs will be constructed. The distance between experimental research and practical application will be shortened. The study will provide reference for the evaluation of service safety and life, and the orientation of application direction of WPCs product, and will provide an effective way for the utilization of forestry waste resources in Guizhou province. The project has economic and social benefits.