The stability of polysiloxanes incorporating nano-scale physical property modifiers
The stability of polysiloxanes incorporating nano-scale physical property modifiers
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DOI：
10.1088/1468-6996/9/2/024403
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发表时间：
2008-04
影响因子：
5.5
通讯作者：
J. Lewicki;M. Patel;P. Morrell;J. Liggat;J. Murphy;R. Pethrick
中科院分区：
文献类型：
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作者：
J. Lewicki;M. Patel;P. Morrell;J. Liggat;J. Murphy;R. Pethrick
摘要 本文报道了用一系列多面体低聚倍半硅氧烷 (POSS) 分子二氧化硅改性的新型聚硅氧烷弹性体的合成及其物理和化学性质的后续表征。结合动态机械分析（DMA）、宽带介电光谱（BDS）和共焦拉曼显微镜，对配制的纳米复合材料系统的物理性质进行了表征。物理性能表征的结果表明，将低含量（1-4%重量）的 POSS 颗粒掺入聚硅氧烷网络中可以显着改善弹性体的机械性能，并显着改变整个系统的运动链动力学。评估这些新型纳米复合材料系统的长期稳定性的研究结果表明，POSS 物理性能改性剂可以显着改变聚硅氧烷弹性体的热稳定性。在某些情况下，物理分散的 POSS 也被证明在聚硅氧烷网络内具有移动性和破坏性，聚集成微米级的区域并迁移到弹性体的表面。这项工作展示了 POSS 纳米颗粒作为物理性能改性剂的潜力，并描述了 POSS 对聚硅氧烷体系物理和化学稳定性的影响。
Abstract Reported here is the synthesis and subsequent characterization of the physical and chemical properties of novel polysiloxane elastomers modified with a series of polyhedraloligomericsilsequioxane (POSS) molecular silicas. The physical properties of the formulated nanocomposite systems have been characterized with a combination of dynamic mechanical analysis (DMA), broadband dielectric spectroscopy (BDS) and confocal Raman microscopy. The results of the physical property characterization demonstrate that the incorporation of low levels (1–4% by wt.) of POSS particles into the polysiloxane network leads to significant improvements in the mechanical properties of the elastomer and significantly alters the motional chain dynamics of the system as a whole. The results of studies performed to assess the long-term stability of these novel nanocomposite systems have demonstrated that POSS physical property modifiers can significantly alter the thermal stability of polysiloxane elastomers. Physically dispersed POSS has also been shown in some cases to be both mobile and disruptive within the polysiloxane networks, agglomerating into domains on a micron scale and migrating to the surface of the elastomers. This work demonstrates both the potential of POSS nanoparticles as physical property modifiers and describes the effects of POSS on the physical and chemical stability of polysiloxane systems.