Wójcik-Bania Monika, Stochmal Edyta
Faculty of Geology, Geophysics, and Environmental Protection, AGH University of Krakow, 30-059 Kraków, Poland.
Faculty of Materials Science and Ceramics, AGH University of Krakow, 30-059 Kraków, Poland.
Materials (Basel). 2024 Nov 27;17(23):5809. doi: 10.3390/ma17235809.
Polysiloxanes with silver nanoparticles (Ag NPs) have garnered attention for their distinctive physicochemical properties, which make them promising candidates for advanced material applications. This study presents a systematic investigation into the thermal properties and degradation mechanisms of polysiloxane/Ag nanocomposites, emphasising the innovative incorporation of Ag NPs directly into polysiloxane networks via in situ reduction of Ag⁺ ions by Si-H groups. Six polysiloxane matrices were synthesised by hydrosilylation of poly(methylhydrosiloxane) (PMHS) or poly(vinylsiloxane) (polymer V) with three cross-linking agents of varying molecular structures and functionality. Thermogravimetric analysis combined with mass spectrometry revealed that the introduction of Ag NPs alters the thermal properties of polysiloxane networks, primarily affecting the redistribution of Si bonds that occurs during the pyrolysis of these systems. Monitoring the pyrolysis process using FTIR spectroscopy allowed us to investigate the effect of the presence of Ag NPs on the degradation mechanism of the studied nanocomposites. The presence of the free-carbon phase and metallic silver phase in the Ag-containing silicon oxycarbide materials obtained was confirmed by Raman spectroscopy and XRD analyses, respectively. These findings demonstrate the possibility of fabricating Ag/SiOC materials with ceramic residues in the range of 43 to 84%. This work provides new insights into the thermal behaviour of polysiloxane/Ag nanocomposites and underscores their potential for high-performance applications in thermally demanding environments.
含有银纳米颗粒（Ag NPs）的聚硅氧烷因其独特的物理化学性质而备受关注，这使其成为先进材料应用的有潜力的候选材料。本研究对聚硅氧烷/Ag纳米复合材料的热性能和降解机制进行了系统研究，重点是通过Si-H基团原位还原Ag⁺离子将Ag NPs直接引入聚硅氧烷网络的创新方法。通过聚（甲基氢硅氧烷）（PMHS）或聚（乙烯基硅氧烷）（聚合物V）与三种分子结构和功能各异的交联剂进行硅氢加成反应，合成了六种聚硅氧烷基体。热重分析结合质谱表明，Ag NPs的引入改变了聚硅氧烷网络的热性能，主要影响了这些体系热解过程中发生的Si键的重新分布。使用傅里叶变换红外光谱监测热解过程，使我们能够研究Ag NPs的存在对所研究的纳米复合材料降解机制的影响。分别通过拉曼光谱和X射线衍射分析证实了所得含银碳氧化硅材料中自由碳相和金属银相的存在。这些发现表明制备陶瓷残留量在43%至84%范围内的Ag/SiOC材料是可能的。这项工作为聚硅氧烷/Ag纳米复合材料的热行为提供了新的见解，并强调了它们在热苛刻环境中高性能应用的潜力。
