Hydrophobic silica composite aerogels using poly(methyl methacrylate) by rapid supercritical extraction process

Hae Noo Ree Jung, Yoon Kwang Lee, V. G. Parale, Hyung Hee Cho, D. B. Mahadik, Hyung Ho Park

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Abstract: A poly(methyl methacrylate) solution was mixed in an optimized tetraethoxysilane-based silica sol and a silica aerogel was obtained by a rapid supercritical extraction process. The hydrophobicity was enhanced by an addition of poly(methyl methacrylate), the silica aerogel prepared with 6 wt% poly(methyl methacrylate) has the contact angle of 156° with low density (0.067 g/cm3), high surface area (829 m2/g), and low thermal conductivity (0.072 W/m·K). The thermogravimetric-differential thermal analysis also showed that the aerogels were hydrophobic up to a temperature of 393 °C. An extra hydrophobicity could be expected for silica aerogel using poly(methyl methacrylate) through the surface modification of silica aerogel with generated –OCH3 and –CH3 radicals by the thermal decomposition of poly(methyl methacrylate) excluding poly(methyl methacrylate) itself. This study provided a simple and cost effective method that used an inexpensive polymer additive without using an expensive surface modification agent nor hydrophobic silica precursor. Graphical Abstract: [InlineMediaObject not available: see fulltext.].

Original languageEnglish
Pages (from-to)692-697
Number of pages6
JournalJournal of Sol-Gel Science and Technology
Volume83
Issue number3
DOIs
Publication statusPublished - 2017 Sep 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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