Progress in Preparation and Properties of POSS/Silicone Rubber Composite
WANG Feng*, PENG Dan, MU Qiuhong, ZHANG Fangzhi, LI Bing, ZHANG Shuo, YU Yitao, LI Jinhui, ZHAO Ning
Shandong Provincial Key Laboratory of Special Silicon-Containing Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Abstract: In recent years, the modification of polymers with polyhedral oligomeric silsesquioxane (POSS) has become a focus of new generation polymer materials. POSS was added into silicone rubber as functional filler to prepare POSS/silicone rubber composites, which was the key direction of modified silicone materials, and has attracted more and more attention. Compared with other filler particles, POSS has unique nano-size organic-inorganic hybrid structure, and can be dispersed in matrix at the level of individual molecule, which lead to the dramatic improvement in properties of silicone rubber materials, and greatly expand their application scope. POSS molecule has a cage-like core similar to SiO2, which gives it excellent heat resistance and mechanical properties. Therefore, POSS can significantly improve the thermal stability and mechanical properties of silicone rubber materials. In recent years, with the emergence of new POSS, the performance of POSS/silicone rubber composites was constantly optimized and their applications were expanding. As a silicon flame retardant, POSS has obtained good application in silicone rubber insulation materials. The introduction of fluorinated POSS monomer into silicone rubber can significantly reduce the dielectric constant of silicone rubber, and the composite can be used as low dielectric materials with excellent properties. PDMS mixed matrix membranes (MMMs) using POSS as filler particles have advantages of organic and inorganic membranes, and high thermal stability. It has shown good application prospects in gas separation and bio-ethanol recovery from aqueous solutions, etc. However,POSS molecules tend to crystallize at room temperature, which result in poor dispersion stability and affect the properties of compo-site. Large amount of studies have focused on the dispersibility of POSS in silicone rubber. According to the dispersion mechanism, the effects of process conditions and POSS type on dispersion were investigated. The relationship between dispersion and performance was studied, and signi-ficant results were obtained. In the future, more efforts should be made to clarify the dispersion mechanism of POSS in polymers and find ways to improve the dispersion stability. In this paper, the preparation methods of POSS monomer and POSS/silicone rubber composite are summarized. In addition, the progress in properties of POSS/silicone rubber composite including mechanical properties, thermal stability, flame retardancy, dielectric properties and pervaporation is reviewed. The development trend of POSS/silicone rubber composite is also prospected. In the future, with the appearance of new POSS compounds and the progress of preparation process, the properties of POSS/silicone rubber composite would achieve greater improvement, and its application field would be further expanded.
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