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首页> 外文期刊>Journal of Applied Polymer Science >Effects of ultraviolet absorbers on the ultraviolet degradation of rice-hull/high-density polyethylene composites
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Effects of ultraviolet absorbers on the ultraviolet degradation of rice-hull/high-density polyethylene composites

机译：紫外线吸收剂对稻壳/高密度聚乙烯复合材料紫外线降解的影响

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摘要

In China, rice-hull powder is widely used as a fiber component to reinforce polymers because of its ready availability and lower cost compared to wood fibers. However, an issue concerning these composites is their weathering durability. In this study, the effects of two ultraviolet absorbers (UVAs), UV-326 and UV-531, on the durability of rice-hull/high-density polyethylene (HDPE) composites were evaluated after the samples were exposed to UV-accelerated weathering tests for up to 2000 h. All of the samples showed significant fading and color changes in exposed areas. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy were used to detect surface chemical changes. The results indicate that surface oxidation commenced immediately within the first 500 h of exposure for all of the samples. However, the control rice-hull/HDPE composites underwent a greater degree of oxidation than those with the UVAs. Scanning electron microscopy revealed that the rice-hull/HDPE composites degraded significantly upon accelerated UV aging, with dense cracking on the exposed surface. The UVAs provided effective protection for the rice-hull/HDPE composites, and UV-326 had a more positive effect on the color stability than UV-531. The results reported herein serve to enhance our understanding of the efficiency of UV stabilizers in the protection of rice-hull/HDPE composites against UV radiation, with a view toward improving their formulation.
机译：在中国，稻壳粉被广泛用作增强聚合物的纤维成分，因为与木纤维相比，稻壳粉易于获得且成本较低。但是，有关这些复合材料的问题是其耐候性。在这项研究中，评估了样品在暴露于紫外线加速的风化作用下后，两种紫外线吸收剂（UVA）UV-326和UV-531对稻壳/高密度聚乙烯（HDPE）复合材料的耐久性的影响。测试长达2000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。 X射线光电子能谱和傅里叶变换红外光谱被用来检测表面化学变化。结果表明，所有样品在暴露的前500小时内立即开始发生表面氧化。但是，对照稻壳/ HDPE复合材料的氧化程度要高于含UVA的那些。扫描电子显微镜显示，稻壳/ HDPE复合材料在加速紫外线老化后会显着降解，在暴露的表面上会出现密集的裂纹。 UVA为稻壳/ HDPE复合材料提供了有效的保护，并且UV-326对颜色稳定性的影响比UV-531更积极。本文报道的结果有助于增进我们对紫外线稳定剂在保护稻壳/ HDPE复合材料免受紫外线辐射影响方面的了解，以期改善其配方。

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