Mechanical properties, creep resistance, and dimensional stability of core/shell structured wood flour/polyethylene composites with highly filled core layer
Mechanical properties, creep resistance, and dimensional stability of core/shell structured wood flour/polyethylene composites with highly filled core layer
复制标题
具有高填充芯层的芯/壳结构木粉/聚乙烯复合材料的机械性能、抗蠕变性和尺寸稳定性
DOI：
10.1016/j.conbuildmat.2019.07.329
复制
发表时间：
2019-11-30
影响因子：
7.4
通讯作者：
Ou, Rongxian
中科院分区：
文献类型：
--
作者：
Hao, Xiaolong;Yi, Xin;Ou, Rongxian
为了获得性能和成本的最佳平衡，本研究的目的是调查木粉（WF）的含量在两个壳和高度填充的芯层上的机械性能，蠕变行为和尺寸稳定性的共挤出WF/高密度聚乙烯复合材料（Co-WPCs）的效果。扫描电子显微镜显示核壳层之间有良好的界面结合。随着壳层中WF含量的增加，Co-WPCs的弯曲强度和模量增加，而弯曲应变和冲击强度降低，但仍高于仅含芯的对照。有限元分析表明，共挤柔性壳层起到了应力传递的作用，避免了应力集中，赋予了复合木塑复合材料较高的韧性。增加核壳层中刚性WF的含量，导致蠕变应变显著降低。用填充量较少的壳层包覆高填充量的芯层，可显著降低吸水率和厚度膨胀率。对于在芯层中具有70wt% WF和在壳层中具有20wt% WF的Co-WPC，弯曲强度、模量和蠕变应变与仅芯对照的那些相当，但是弯曲应变、冲击强度和耐水性好得多。(C)2019爱思唯尔有限公司版权所有。
To obtain an optimum balance in performance and cost, this study aims to investigate the effect of wood flour (WF) content in both shell and highly filled core layers on the mechanical properties, creep behavior, and dimensional stability of the resulting coextruded WF/high density polyethylene composites (Co-WPCs). Scanning electron microscopy showed good interfacial adhesion between the core and shell layers. The flexural strength and modulus of the Co-WPCs increased with increasing WF content in shell layer, while the flexural strain and impact strength decreased but still higher than those of the core-only controls. Finite element analysis showed that the coextruded flexible shell layer acted as a stress transferring medium avoiding stress concentration and endowed the Co-WPCs with higher toughness. Increasing the content of rigid WF in both the core and shell layers resulted in significant reduction in creep strain. Coating the highly filled core layer with less filled shell layer can markedly reduce the water absorption and thickness swelling. For Co-WPCs with 70 wt% WF in core layer and 20 wt% WF in shell layer, the flexural strength, modulus, and creep strain were comparable to those of the core-only control, but the flexural strain, impact strength, and water resistance were much better. (C) 2019 Elsevier Ltd. All rights reserved.