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首页> 外文期刊>International Journal of Sustainable Materials and Structural Systems >More durable or more vulnerable? - Effect of nanoparticles on long-term performance of polymeric nanocomposites during UV exposure
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More durable or more vulnerable? - Effect of nanoparticles on long-term performance of polymeric nanocomposites during UV exposure

机译：更耐用或更脆弱？ -纳米粒子对紫外线暴露期间聚合物纳米复合材料长期性能的影响

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摘要

ZnO nanoparticle is being used as an inorganic UV absorber for polymers. However, the mechanism of how ZnO nanoparticles influence the photo degradation of polymersis is not well understood. This study has investigated the role of ZnO nanoparticles in the long-term performance of a polyurethane (PU) nanocomposite subject to UV radiation. PU samples containing different levels of ZnO nanoparticles were exposed to the NIST Simulated Photodegradation via High Energy Radiant Exposure (SPHERE) UV chamber under both dry (0% RH) and moist (75% RH) conditions at 45℃. Chemical and physical properties with exposure times were characterised using multiple spectroscopic and microscopic techniques. The results indicated that the studied ZnO nanoparticles acted as a catalyst and accelerated the photodegradation of PU. The photo-catalytic effect was dependent on ZnO concentration and RH. It is suggested that systematical long-term performance study under different exposure environments is important for correctly evaluating the role of nanoparticles on durability and sustainability of polymer nanocomposites.
机译：ZnO纳米颗粒被用作聚合物的无机紫外线吸收剂。然而，关于ZnO纳米颗粒如何影响聚合反应的光降解的机理尚不清楚。这项研究研究了ZnO纳米粒子在遭受紫外线辐射的聚氨酯（PU）纳米复合材料的长期性能中的作用。含有不同含量的ZnO纳米颗粒的PU样品通过高能辐射暴露（SPHERE）UV室在45°C的干燥（0％RH）和潮湿（75％RH）条件下暴露于NIST模拟的光降解。使用多种光谱和显微镜技术表征化学和物理性质以及暴露时间。结果表明，所研究的ZnO纳米粒子充当催化剂并促进了PU的光降解。光催化作用取决于ZnO浓度和RH。建议在不同的暴露环境下进行系统的长期性能研究对于正确评估纳米颗粒对聚合物纳米复合材料的耐久性和可持续性的作用很重要。

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