Improving the Damping Properties of Nanocomposites by Monodispersed Hybrid POSS Nanoparticles: Preparation and Mechanisms

• DOI: 10.3390/polym11040647
• Publication Date: 2019-04-10T07:47:36Z
• Authors: Wei Wei; Yingjun Zhang; Meihua Liu; Yifan Zhang; Yuan Yin; Wojciech Stanisla...; Pengyang Deng; Chunbai Zheng
• Keywords: Silsesquioxane; Siloxane

In this work, a series of heptaphenyl siloxane trisilanol/polyhedral oligomeric silsesquioxane (T₇-POSS) modified by polyols with different molecular weights were synthesized into liquid-like nanoparticle⁻organic hybrid materials using the grafted-from method. All grafted POSS nanoparticles changed from solid powders to liquid at room temperature. Polyurethane (PU) nanocomposites contents ranging 1.75 9.72 wt % prepared these liquefied polyols-terminated polyepichlorohydrin (POSS–PECH). Transmission electron microscopy (TEM), scanning (SEM) and energy dispersive spectroscopy (EDS) used characterize morphology POSS–PECH/PU nanocomposites. The results showed that polyol-terminated particles overcame nanoagglomeration effect evenly disperse in polymeric matrix. damping factor (tan δ) resultant increased 0.90 1.16, while glass transition temperature decreased 15.8 9.4 °C when 0 9.75 %. gel content, tensile strength Fourier transform infrared (FTIR) analyses demonstrated thermal movement ability polyurethane matrix increasing content. Therefore, improvement properties composites was mainly due friction-related losses occurring interface region between