Non-functionalized and n-alkyl functionalized polyhedral oligomeric silsesquioxanes (POSS), siloxane-silsesquioxane resins and the sol-gel silicas were for the first time examined as possible UV-stabilizers and/or antioxidants in polypropylene (PP). The obtained composites were subjected to the accelerated laboratory weathering tests. The influence of the weathering conditions on the structure and properties of the PP materials was evaluated on the basis of the results from Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) studies. It was found that weathering resistance of the PP materials was strongly depended on the kind of the silicon-based filler used. Functionalized silsesquioxanes and siloxane-silsesquioxane resins improved weathering resistance of the PP materials, most probably because of its uniform dispersion in polymer, and thus, they could be considered as antioxidant additives. The changes in structural characteristics influenced thermal properties of the PP composites. It was revealed that the addition of the n-alkyl functionalized POSS and siloxane-silsesquioxane resins caused less significant changes in the melting and crystallization behaviour of PP materials.

非功能化和n首次检测了烷基-烷基官能化的多面体低聚倍半硅氧烷（POSS），硅氧烷-倍半硅氧烷树脂和溶胶-凝胶二氧化硅，作为聚丙烯（PP）中可能的紫外线稳定剂和/或抗氧化剂。将获得的复合材料进行加速的实验室耐候性测试。根据傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM）和差示扫描量热法（DSC）研究的结果，评估了风化条件对PP材料的结构和性能的影响。已经发现，PP材料的耐候性在很大程度上取决于所使用的硅基填料的种类。功能化的倍半硅氧烷和硅氧烷倍半硅氧烷树脂可改善PP材料的耐候性，最有可能是由于其在聚合物中的均匀分散，因此，可以将它们视为抗氧化剂添加剂。结构特性的变化影响了PP复合材料的热性能。据透露，除了正烷基官能化的POSS和硅氧烷倍半硅氧烷树脂在PP材料的熔融和结晶行为中引起的变化较小。