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首页> 外文期刊>Polymer bulletin >Subsurface mechanical properties and subsurface creep behaviour of modified nanoclay-based wood-plastic composites studied by nanoindentation
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Subsurface mechanical properties and subsurface creep behaviour of modified nanoclay-based wood-plastic composites studied by nanoindentation

机译：基于改进的纳米粘土基木塑复合材料的地下机械性能和地下蠕变行为

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摘要

Wood-plastic composites (WPCs) were prepared by polypropylene, wood flour, maleic anhydride-grafted polypropylene and pristine (Na+ montmorillonite)/TMI-modified nanoclay using extruder followed by injection moulding technique. The surface mechanical properties of the nanoclay-based WPC were investigated by means of nanoindentation technique. The results show that the hardness, elastic modulus and creep resistant of the WPC dramatically enhanced with the incorporation of nanoclay. This enhancement was dependent on the nanoclay content as well as the dispersion of nanoclay in the polymer matrix. At 1wt% nanoclay content, the hardness, elastic modulus and creep resistant of pristine nanoclay-reinforced WPC (WPC/MMT) improved by approximately 35%, 30% and 15%, respectively, compared to WPC without nanoclay. For the TMI-modified nanoclay-based WPC (WPC/MMT Cu), the improvements in these properties were about 1.2, 1.5 and 1.5 times higher than the WPC/MMT. Viscoelastic model was applied to examine the effect of nanoclay loadings on the creep performance of the WPC. Results exhibited that the model was in good agreement with the experimental data. Incorporation of nanoclay leads to an increase in elastic deformation, especially in WPC/MMT Cu, and induces a higher initial displacement at the early stage of creep.
机译：使用挤出机通过聚丙烯，木粉，马来酸酐接枝的聚丙烯和原始（NA + MONTMORILLILALITE）/ TMI改性纳米粘土制备木塑复合材料（WPC），然后用注射成型技术。通过纳米趋势技术研究了基于纳米粘土的WPC的表面力学性能。结果表明，随着纳米粘土的掺入，WPC的硬度，弹性模量和抗蠕变性显着增强。这种增强依赖于纳米粘土含量以及纳米粘土在聚合物基质中的分散体。在1wt％的纳米粘土含量下，与无纳米粘土的WPC相比，丙氨酸纳米粘土增强WPC（WPC / MMT）的硬度分别提高了约35％，30％和15％的抗蠕变。对于基于TMI改性的纳米铬基WPC（WPC / MMT Cu），这些性质的改善约为1.2,1.5和1.5和1.5倍，高于WPC / MMT。粘弹性模型应用于检测纳米粘土载荷对WPC蠕变性能的影响。结果表明，该模型与实验数据吻合良好。纳米粘土的掺入导致弹性变形的增加，特别是在WPC / MMT Cu中，并在蠕变的早期阶段引起更高的初始位移。

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