木纤维的定向制备及其几何尺寸对木塑复合材力学性能的影响

Directional Preparation of Biomass Fibers and Effect of the Fiber Geometry on the Mechanical Properties of Wood-plastic Composite

高质量的生物质微细纤维作为木塑复合材(WPC)填料可使产品综合性能显著提高。笔者围绕WPC用微细纤维的定向制备展开研究,考察了不同含水率、不同树种和不同形态原料对制备的木纤维质量的影响及以其为增强材料制备的WPC力学性能。结果表明:随着原料初含水率的增加,木纤维的整体几何尺寸明显增大;单板粉碎制备的纤维长度和直径比木片制备的纤维稍大;当木纤维直径为0.21 mm<d≤0.29 mm、长径比为5~7时可赋予WPC较好的力学性能,与纤维直径为0.14 mm的WPC相比,拉伸、弯曲及冲击强度分别提高了10.12%、6.13%及14.65%。

Using high-quality wood fibers as reinforcement materials in wood-plastic composite(WPC)significantly improves the overall performance of the resulting WPC.This study focuses on the preparation of various wood fibers for use in WPC,investing the effects of moisture content,wood species and raw material form on the quality of wood fibers prepared and on the mechanical properties of wood fiber-reinforced polyethylene(PE).The main findings indicated that the overall sizes of wood fibers significantly increased with the initial moisture content of raw materials.The lengths and diameters of wood fibers prepared from veneers were larger than those of fibers prepared from chips.A wood fiber diameter between 0.21 and 0.29 mm and a length to diameter ratio between 5 and 7 yielded the best mechanical properties for the resultant products.Compared to the fiber diameter was 0.14 mm,the tensile strength,bending properties and impact strength of WPC increased by 10.12%,6.13%and 14.65%.