Preparation and characterization of gradient distribution of silicon in emulsion blend films |
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Authors: | Liang Hu Fan Yang Chaocan Zhang Yuanyuan Hu Yanjun Chen |
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Institution: | (1) School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China |
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Abstract: | In this work, a functional gradient polymeric material derived from silicon-containing acrylate blend emulsion film is prepared
in two steps. Firstly, 3-tris(trimethylsilyloxy)silyl] propyl methacrylate (TRIS)-modified acrylate latex is prepared using
multiple emulsifiers by the two-stage semicontinuous emulsion copolymerization method. Next, blend latexes composed of TRIS-containing
and TRIS-free acrylate latexes are obtained. Detailed studies on the effects of the film-formation temperature and the glass
transition temperature (T
g) differences on the compositional gradient film are conducted. Surface energy analysis shows that silicon elements enriched
at the film-air (F-A) interface and T
g differences facilitate the fabrication of silicon gradient in emulsion blend films. Scanning electron microscopy-energy dispersive
X-ray further reveals that the concentration of silicon components varies in a gradient-like manner along the overall transaction
of the film when the film-formation temperature is 55 °C. However, excessive temperature creates the formation of a segmental
gradient distribution of silicon in the emulsion blend films. |
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Keywords: | |
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