将废弃资源用于核层结构的共挤出木塑复合材料核/壳界面性能研究

The co-extruded wood-plastic composites with a core-shell structure showed significant advances. If using waste resources such as agriculture and forestry residuum, or recycled plastic, as the raw materials of core structure, the cost would drastically decrease. However, because of the difference between the shell structure and the low quality core materials, the interface would impact a plurality of properties of the composites. That has been a new challenging problem. Based on our foundation of using recycled materials prepared wood-plastic composites and utilizing co-extrusion technology prepared wood-plastic composites with a core-shell structure, we propose to further use waste resources as the raw materials of core structure, and design a co-extruded wood-plastic composites with a core-shell structure. This research will focus on the interface bonding between the core/shell structures and make an intensive study. Using the melt rheology, material thermodynamics, surface elements analysis, micromorphology observations, and other scientific analyzing methods, research the dynamic bonding behavior and situation of the core-shell structure during the thermoforming process. Based on the above conception, the research will systematic explore the correlation of the material type, composite structure, core/shell interface property, and the macro properties of the co-extruded wood-plastic composites. Building up an effective regulatory mechanism between the micro characteristics of core/shell interface and the macro properties of composites by optimize the impact factor of interface properties. This research will provide theoretical basis for the novel multi-layer wood-plastic composites.

以共挤出技术制备具有核-壳结构的木塑复合材料体现出明显性能优势，若进一步将废旧塑料、农林剩余物等废弃资源应用于制造其核层结构，则可大幅度降低原料成本。但由于低质核层原料与壳层之间的差异，核-壳结构间的界面结合将影响复合材料的多项性能而成为新的挑战性疑难问题。基于此构思，申请者在利用回收原料制备复合材料和共挤出技术制备核-壳结构木塑复合材两项前期研究基础上，拟进一步以废弃资源为核层原料，设计具有核-壳双层结构的共挤出木塑复合材料，聚焦于该材料核层与壳层结构间的界面结合问题进行深入研究。通过熔体流变学、材料热动力学、表面元素分析、微观形貌观察等分析手段重点探讨核层及壳层材料在加工过程中的动态结合行为和结合状态，系统研究多种原料及结构因素与核/壳界面性能乃至材料宏观性能的相关性，通过对因子参数的优化反馈, 建立界面微观特性与材料宏观性能之间的有效调控方案，为新型多层木塑复合材料研究提供理论基础。

以共挤出技术制备具有核-壳结构的木塑复合材料体现出明显性能优势，若进一步将废旧塑料、农林剩余物等废弃资源应用于制造其核层结构，则可大幅度降低原料成本。但由于低质核层原料与壳层之间的差异，核-壳结构间的界面结合将影响复合材料的多项性能而成为新的挑战性疑难问题。基于此构思，项目组在利用回收原料制备复合材料和共挤出技术制备核-壳结构木塑复合材两项前期研究基础上，拟进一步以废弃资源为核层原料，设计具有核-壳双层结构的共挤出木塑复合材料，聚焦于该材料核层与壳层结构间的界面结合问题进行深入研究。选取甘蔗渣、稻秸和稻壳三种剩余农业纤维为主要的核层填充物与高密度聚乙烯为塑料基体制备共挤出技术木塑复合材料，重点考察以上剩余农业纤维化学成分、堆积密度、粒径分布、微观形貌等因素对整体复合材料性能的影响，通过熔体流变学、材料热动力学、表面元素分析、微观形貌观察等分析手段重点探讨了以废弃资源为主体的核层及壳层材料在加工过程中的动态结合行为和结合状态，并开发了通过核壳剥离强度测试反馈材料整体性能的测试方法，系统研究多种原料及结构因素与核/壳界面性能乃至材料宏观性能的相关性，通过对因子参数的优化反馈, 建立界面微观特性与材料宏观性能之间的有效调控方案，为新型多层木塑复合材料研究提供理论基础。