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<p>In this study, we designed and synthesized a filler comprising a polyoctahedral oligomeric silsesquioxane (POSS) core and perfluoroalkyl side chains. We found that by blending POSS fillers into a fluorinated polymer, the refractive indices of fluorinated polymer films can be efficiently lowered. The perfluoroalkyl side chains increase the compatibility with fluorinated polymers, and the dendrimer-like structure of POSS creates a large space in the material. The degree of packing was quantitatively evaluated by using the packing coefficient (<i>k</i><sub>p</sub>), which was decomposed into two components: the fluorinated polymer (<i>k</i><sub>p</sub>,<sub>1</sub>) and the POSS (<i>k</i><sub>p</sub>,<sub>2</sub>). Owing to the small packing coefficient of the POSS component (<i>k</i><sub>p</sub>,<sub>2</sub> = 0.430–0.513), the refractive index (<i>n</i>) of the composite material decreased to <i>n</i> = 1.379 from that of the pristine fluorinated polymer (<i>n</i> = 1.424, <i>k</i><sub>p</sub>,<sub>1</sub> = 0.68–0.76). This study represents a milestone for further reducing the refractive indices of various fluorinated polymers currently in practical use.</p>

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Fabrication of fluorinated polymer composite materials with a perfluoroalkylated POSS filler to reduce the refractive index

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Tatsuaki Kunimitsu,
  • Keisuke Shibahara,
  • Masayuki Gon,
  • Kazuo Tanaka

摘要

In this study, we designed and synthesized a filler comprising a polyoctahedral oligomeric silsesquioxane (POSS) core and perfluoroalkyl side chains. We found that by blending POSS fillers into a fluorinated polymer, the refractive indices of fluorinated polymer films can be efficiently lowered. The perfluoroalkyl side chains increase the compatibility with fluorinated polymers, and the dendrimer-like structure of POSS creates a large space in the material. The degree of packing was quantitatively evaluated by using the packing coefficient (kp), which was decomposed into two components: the fluorinated polymer (kp,1) and the POSS (kp,2). Owing to the small packing coefficient of the POSS component (kp,2 = 0.430–0.513), the refractive index (n) of the composite material decreased to n = 1.379 from that of the pristine fluorinated polymer (n = 1.424, kp,1 = 0.68–0.76). This study represents a milestone for further reducing the refractive indices of various fluorinated polymers currently in practical use.