纤维粒径对荔枝修枝木/高密度聚乙烯复合材料性能的影响  

Effect of Particle Size on Properties of High-Density Litchi chinensis Pruning Wood-Polyethylene Composites

作　　者：陈世桓 周桥芳[1] 王先菊[1,2] 云虹 胡传双[1,3] 涂登云[1,3] CHEN Shihuan;ZHOU Qiaofang;WANG Xianju;YUN Hong;HU Chuanshuang;TU Dengyun(Key Laboratory of Bio-based Materials and Energy,Ministry of Education,South China Agricultural University,Guangzhou 510642,Guangdong,China;Department of Applied Physics,School of Electronic Engineering,School of Artificial Intelligence,South China Agricultural University,Guangzhou 510642,Guangdong,China;Lingnan Modern Agricultural Science and Technology Maoming Branch of Guangdong Provincial Laboratory,Maoming 525032,Guangdong,China)

机构地区：[1]华南农业大学生物基材料与能源教育部重点实验室,广东广州510642 [2]华南农业大学电子工程学院人工智能学院应用物理系,广东广州510642 [3]岭南现代农业科学与技术广东省实验室茂名分中心,广东茂名525032

出　　处：《木材科学与技术》2023年第3期35-43,共9页Chinese Journal of Wood Science and Technology

基　　金：广东省林业科技创新项目“荔枝树修枝剩余物高效利用关键技术研究与示范”(2022KJCX016);茂名实验室自主科研项目“荔枝修枝副产物资源化利用关键技术研究及应用”(2022ZD002)。

摘　　要：为了解决荔枝修枝木的利用问题,以荔枝修枝木纤维和高密度聚乙烯为主要原料,采用挤出成型的方法制备荔枝修枝木/HDPE复合材料(LWPC)。采用热重法测定荔枝木的热稳定性,利用体式显微镜观察荔枝木纤维形态,分析荔枝木纤维粒径对LWPC性能的影响。结果表明:荔枝木纤维初始降解温度为255℃;随着荔枝木纤维粒径的减小,其长径比先增大后逐渐减小。在动态流变测试中,随着荔枝木纤维粒径的减小,LWPC熔体的平衡转矩和平衡剪切热先降低后升高,储能模量、损耗模量和复数黏度增加。在动态热机械测试中,随着荔枝木纤维粒径的减小,LWPC的储能模量、损耗模量逐渐增大。LWPC的密度、吸水率、弯曲及拉伸性能呈现增大趋势,吸水厚度膨胀率则呈减小趋势。综合考虑LWPC的加工流变性能和物理力学性能,宜选用粒径<300μm的荔枝木纤维,制得LWPC的弯曲强度、弯曲模量最高分别为31.11 MPa、2.91 GPa,达到GB/T 24137—2009《木塑装饰板》的要求。In order to improve the utilization of Litchi chinensis pruning wood,Litchi chinensis wood/plastic composites(LWPC)were prepared by extrusion molding of Litchi chinensis pruning wood fibers and high-density polyethylene.The thermal stability of Litchi chinensis wood was measured using the thermogravimetric method.The fiber morphology of Litchi chinensis wood was evaluated using stereomicroscope.The effect of Litchi chinensis wood particle size on the performance of LWPC was analyzed.The results showed that the temperature was 255℃when Litchi chinensis wood fibers initially degraded.As the size of Litchi chinensis wood fiber decreases,its length-diameter ratio first increases and then gradually decreases.In dynamic rheological testing,as the particle size decreases,the equilibrium torque and equilibrium shear heat of LWPC-melt first decrease and then increase,while the storage modulus,loss modulus,and complex viscosity increase.In dynamic thermal-mechanical testing,the storage modulus and loss modulus of LWPC gradually increase with the decrease in the particle size.The density,water absorption,and mechanical properties of LWPC show an increasing trend,while the water absorption thickness expansion rate shows a decreasing trend.Considering the processing rheological properties,physical,and mechanical properties of LWPC,the particle size of<300μm is suggested to prepare LWPC.The maximum bending strength and flexural modulus of the LWPC are 31.11 MPa and 2.91 GPa respectively,which meet the performance requirements of GB/T 24137-2009 Wood Plastic Decorative Panels.

关 键 词：荔枝木 木纤维粒径 木塑复合材料 力学性能 流变性能 

分 类 号：S789[农业科学—林学] TB332[一般工业技术—材料科学与工程]