Preparation and properties of polydimethylsiloxane-mica composites

Authors

  • Zhenmei Jia,

    1. Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, People's Republic of China
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  • Shuangjun Chen,

    1. Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, People's Republic of China
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  • Jun Zhang

    Corresponding author
    1. Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, People's Republic of China
    • Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, People's Republic of China
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Abstract

This is a comparison study of the effects of various colloids on polydimethylsiloxane (PDMS) nanocomposites. Mica of layered structure and silica of nanospherical shape were both used with different content. Silane coupling agent was used for surface modification of mica to improve its dispersion. Wide X-ray diffraction patterns showed no intercalation during the incorporation of mica into PDMS matrix. Rheological characterization of the PDMS composites before curing showed that viscosities of PDMS-mica composites were much lower than that of PDMS composites with silica, particularly at low shear rates. Scanning electron microscope (SEM) suggested the existence of mica lamellar structure with high aspect ratio within the PDMS matrix. After vulcanization at room temperature, PDMS-mica composites could obtain mechanical properties close to that of PDMS composites with silica at same filler content. The cooperative effects of mica with silica showed that same mechanical properties of PDMS composites could be obtained at much lower viscosity, cost, and processing insecurity. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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