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首页> 外文期刊>Journal of Cleaner Production >High-strength, lightweight, co-extruded wood flour-polyvinyl chloride/lumber composites: Effects of wood content in shell layer on mechanical properties, creep resistance, and dimensional stability
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High-strength, lightweight, co-extruded wood flour-polyvinyl chloride/lumber composites: Effects of wood content in shell layer on mechanical properties, creep resistance, and dimensional stability

机译：高强度，轻质，共挤出木粉-聚氯乙烯/木材复合材料：壳层中的木材含量对机械性能，抗蠕变性和尺寸稳定性的影响

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The defects of creep deformation and brittle fracture, which coexist in wood plastic composites (WPCs), significantly restrict WPCs as structural engineering materials. This study aims to advance WPCs via structural design and co-extrusion technology, for the development of a lightweight, high-strength, tough, creep-resistant, and water-resistant composite, for structural engineering applications. Novel wood-plastic/lumber composites (WPLCs) were fabricated with high-strength lightweight laminated veneer lumber (LVL) as a core and water-resistant wood-polyvinyl chloride composites (WPVCs) as the shell layer using multi-phase co-extrusion technology. The effect of wood content in the shell layer on flexural properties, impact strength, low-velocity impact behavior, creep resistance, and dimensional stability of the WPLCs were investigated and compared with those of LVL and WPVCs. Increasing wood content within the scope of the experiment resulted in increased flexural strength and modulus in both WPVCs and WPLCs. The flexural modulus and impact strength of WPLC containing 60 phr wood in shell layer (WPLC60) were significantly increased by 112.8% and 303.6%, respectively, compared with that of the corresponding WPVC60 control. Factoring in composite density, the comparison between WPLCs and WPVCs showed specific flexural modulus and impact strength of WPLC60 as 284% and 704% of the values of WPVC60, respectively. The WPLCs exhibited higher impact resistance and bending stiffness and lower absorbed energy and permanent indentation than those of LVL. The creep strain of the WPLCs decreased with increasing wood content in the shell layers. Specifically, the creep strain of WPLC60 was 85.8% and 28.9% of the values of LVL and WPVC60, respectively. The WPLCs almost kept their original appearance except for discoloration after nine cycles of hot water immersion. The water absorption and thickness swelling of the WPLCs were below 1.0% and considerably lower than those of the LVL and pure PVC coextruded samples. The experimental results indicated that the novel co-extruded wood-plastic/lumber composites effectively achieved excellent performance suitable for structural engineering applications. (C) 2019 Elsevier Ltd. All rights reserved.
机译：木塑复合材料（WPC）中共存的蠕变变形和脆性断裂缺陷极大地限制了WPC作为结构工程材料的使用。这项研究旨在通过结构设计和共挤技术来提高WPC的性能，以开发轻质，高强度，坚韧，耐蠕变性和耐水性的复合材料，用于结构工程应用。使用多相共挤技术，以高强度轻质层压单板木材（LVL）为核心，以耐水的木材-聚氯乙烯复合材料（WPVCs）为壳层，制备了新型木塑/木材复合材料（WPLC） 。研究了壳层中木材含量对WPLC的弯曲性能，冲击强度，低速冲击行为，抗蠕变性和尺寸稳定性的影响，并与LVL和WPVC进行了比较。在实验范围内增加木材含量会导致WPVC和WPLC的抗弯强度和模量增加。与相应的WPVC60对照相比，壳层中包含60 phr木材的WPLC（WPLC60）的弯曲模量和冲击强度分别显着提高了112.8％和303.6％。考虑到复合材料密度，WPLC和WPVC的比较显示WPLC60的比弯曲模量和冲击强度分别为WPVC60值的284％和704％。与LVL相比，WPLC表现出更高的抗冲击性和弯曲刚度，更低的吸收能和永久压痕。 WPLC的蠕变应变随着壳层中木材含量的增加而降低。具体而言，WPLC60的蠕变应变分别为LVL和WPVC60值的85.8％和28.9％。除了经过九个热水浸泡循环后的变色，WPLC几乎保持了其原始外观。 WPLC的吸水率和厚度膨胀率低于1.0％，远低于LVL和纯PVC共挤出样品的吸水率和厚度膨胀率。实验结果表明，新型共挤木塑/木材复合材料有效地获得了适合结构工程应用的优异性能。 （C）2019 Elsevier Ltd.保留所有权利。

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