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首页> 外文期刊>Journal of Applied Polymer Science >Effects of pigments on the uv degradation of wood-flour/HDPE composites
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Effects of pigments on the uv degradation of wood-flour/HDPE composites

机译：颜料对木粉/ HDPE复合材料紫外线降解的影响

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摘要

The effects of different color pigments on the durability of wood-flour/high-density polyethylene composites (WF/HDPE) were evaluated by UV-accelerated weathering tests. WF/HDPE composites were dyed using three different color inorganic pigments, which were added at 2% based on the weight of the composite. Samples were weathered in Q-panel UV aging equipment for 1500 h. All samples showed significant fading and color changes in exposed areas. Changes in surface chemistry were studied using spectroscopic techniques. X-ray photoelectron spectroscopy (XPS) was used to verify the occurrence of surface oxidation. Changes in carbonyl groups (C=O), PE crystallinity, cellulose CAO, and lignin aromatic C=C were detected by Fourier transform infrared (FTIR) spectroscopy. The results indicate that surface oxidation occurred immediately within exposure 250 h for all samples; the surface of the control WF/HDPE composites was oxidized to a greater extent than that of the dyed WF/HDPE. This suggests that the addition of pigments to the WF/HDPE composites results in less weather-related damage. The surface configuration observed by scanning electron microscopy revealed that WF/HDPE composites degraded significantly on accelerated UV aging, with dense cracking apparent on the exposed surface. Carbon black had a more positive effect on color stability than the other pigments.
机译：通过紫外线加速老化试验评估了不同颜色颜料对木粉/高密度聚乙烯复合材料（WF / HDPE）耐久性的影响。 WF / HDPE复合材料使用三种不同颜色的无机颜料进行染色，以复合材料的重量为基准，添加量为2％。将样品在Q-panel紫外线老化设备中风化1500小时。所有样品在暴露区域均显示出明显的褪色和颜色变化。使用光谱技术研究了表面化学的变化。 X射线光电子能谱（XPS）用于验证表面氧化的发生。通过傅立叶变换红外（FTIR）光谱检测到羰基（C = O），PE结晶度，纤维素CAO和木质素芳族C = C的变化。结果表明，所有样品在暴露250小时内即立即发生表面氧化。对照WF / HDPE复合材料的表面被氧化的程度大于染色的WF / HDPE复合材料的表面。这表明向WF / HDPE复合材料中添加颜料可减少与天气相关的损害。扫描电子显微镜观察到的表面结构表明，WF / HDPE复合材料在加速的UV老化下会显着降解，在暴露的表面上会出现致密的裂纹。炭黑比其他颜料对颜色稳定性具有更积极的影响。

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