摘要
木塑复合材料在节能和环保等方面发挥了重要的作用,而较差的抗蠕变性严重影响和制约了其拓展应用。采用两步挤出成型法制备了马尾松木粉和杉木木粉增强高密度聚乙烯(HDPE)复合材料,研究马尾松木粉/HDPE复合材料和杉木木粉/HDPE复合材料的弯曲力学性能、24 h弯曲蠕变-24 h回复性能,并利用两参数指数模型和Findley指数模型模拟蠕变。结果表明,马尾松木粉/HDPE复合材料的弯曲性能较杉木木粉/HDPE复合材料差,但24 h蠕变性能较好,在10%、20%和30%的应力水平下,24 h应变仅为杉木木粉/HDPE复合材料的43.91%、74.33%和72.56%;而杉木木粉/HDPE复合材料的蠕变受载荷的影响比马尾松木粉/HDPE复合材料小,且回复性能较好。两参数指数模型和Findley指数模型对于复合材料在较大载荷作用下的蠕变行为模拟得较好,Findley指数模型的模拟效果优于两参数指数模型。
In energy-saving and environmental protection,wood-plastic composites(WPCs)play an important role,however,the expansion of this application is seriously affected and restricted by the poor creep resistance of WPCs.High density polyethylene(HDPE)composites reinforced by Pinus massoniana and Cunninghamia lanceolate flour were prepared by the two-step extrusion molding method.The bending,24 h bending creep,and 24 h recovery properties of the two kinds of composites were investigated.Creep was also simulated using the two-parameter power law model and the Findley′s power law model.The bending properties of the P.massoniana flour/HDPE composite were worse than those of the C.lanceolate flour/HDPE composite,but the 24 h creep properties of the P.massoniana flour/HDPE composite were comparatively better,and the strains under a stress levels of 10%,20%,and 30%were only 43.91%,74.33%,and 72.56%,respectively,of those determined for the C.lanceolate flour/HDPE composite.The creep of the C.lanceolate flour/HDPE composite was less affected by the load than that of the P.massoniana flour/HDPE composite,and the recovery performance was better.The creep behaviors of these composites under high stress were well simulated by the Findley index model and the two-parameter index model,but the former provided the superior model.
作者
徐海龙
曹岩
李利芬
单伟东
郝建秀
杨小慧
XU Hailong;CAO Yan;LI Lifen;SHAN Weidong;HAO Jianxiu;YANG Xiaohui(Special and Key Laboratory for Development and Utilization of Guizhou Superior Bio-based Materials,Guizhou Minzu University,Guiyang,Guizhou 550025,China;College of Data Science and Information Engineering,Guizhou Minzu University,Guiyang,Guizhou 550025,China;College of Material Science and Engineering,Guizhou Minzu University,Guiyang,Guizhou 550025,China;College of Forestry,Guizhou University,Guiyang,Guizhou 550025,China;Key Laboratory of Bio-based Material Science&Technology,Ministry of Education,Northeast Forestry Unive)
出处
《森林与环境学报》
CSCD
北大核心
2019年第6期654-659,共6页
Journal of Forest and Environment
基金
国家自然科学基金项目(31460171)
贵州省科学技术基金计划项目(黔科合J字[2015]2075号、黔科合基础[2019]1170号)
贵州省教育厅项目(黔教合KY字[2017]003、黔教合KY字[2017]136)
贵州大学引进人才项目(贵大人基合字[2015]66号)
关键词
木塑复合材料
马尾松
杉木
弯曲性能
蠕变性能
wood-plastic composite
Pinus massoniana
Cunninghamia lanceolate
bending properties
creep properties
