Polyurethanes represent one of the most frequently used polymeric matrixes in composites. Although there have been many studies focused on the weather resistance of polyurethanes, this important property is unheeded during the reinforcing phase. In this article, the effects of ultraviolet (UV) radiation on the changes in optical properties of commercially available glass fibre reinforcements containing various polymeric binders used as compatibilising agents for the polymeric matrix in the final composite products were studied. The standardised experiments were performed using accelerated ageing equipment, q‐lab ultraviolet tester, in dry mode. Chemical modification of the binder in the form of polyesters or silanes by UV irradiation was studied using Fourier Transform–infrared spectroscopy. Changes in the optical properties caused by the degradation processes of polymeric components due to UV irradiation were evaluated based on colour changes in the examined samples using the yellowness index; statistical evaluation of the data obtained was conducted with an Anderson–Darling test of normality and an ANOVA test. It was demonstrated that both the amount of the binder and the glass fibre reinforcement's construction play a more important role than the chemical structure of the binder.

中文翻译：

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紫外线辐射对聚氨酯基复合材料玻璃纤维增​​强材料光学性能的影响

聚氨酯代表复合材料中最常用的聚合物基体之一。尽管有许多研究集中在聚氨酯的耐候性上，但是在增强阶段并未注意到这一重要性能。在本文中，研究了紫外线（UV）辐射对商用玻璃纤维增​​强材料光学性能变化的影响，该玻璃纤维增​​强材料包含各种聚合物粘合剂，可作为最终复合产品中聚合物基质的相容剂。标准化实验是使用加速老化设备q-lab紫外线测试仪在干燥模式下进行的。使用傅立叶变换红外光谱研究了通过紫外线照射对聚酯或硅烷形式的粘合剂进行化学改性的方法。使用黄度指数，基于所检查的样品的颜色变化来评估由聚合物组分由于紫外线照射而引起的降解过程所引起的光学性能变化；使用安德森-达林正态检验和ANOVA检验对获得的数据进行统计评估。已经证明，粘合剂的量和玻璃纤维增​​强材料的结构都比粘合剂的化学结构起着更重要的作用。