Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 147, Issue JUL, Pages 45-51Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2017.04.036
Keywords
Sol-gel methods; Flexible composites; Elastic properties; Thermal properties
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2015R1D1A1A02062229]
- Center for Advanced Meta Materials (CAMM) - Ministry of Science, ICT and Future Planning [NRF-2014M3A6B3063716]
- Department of Science and Technology, Govt. of India
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Flexible, elastic, low density, superhydrophobic, and low thermal conductive silica-polymer composite aerogel materials were prepared by a high internal phase emulsion (HIPE) process followed with sol-gel process. Flexible silica aerogels were grown in the scaffold of macro-porous flexible polymer monolith to overcome the brittle nature of silica aerogels. Initially, porous polymer monolith was prepared by HIPE and was used as a scaffold for preparation of flexible silica aerogels by sol-gel protess followed by supercritical drying. Polymer monolith was soaked in a pre-hydrolyzed methyltrimethoxysilane (MTMS) based silica sol and gelation was achieved by two step sol-gel process. Composite monolith possess extreme properties such as high flexibility, elasticity, superhydrophobicity (165 degrees), low density (0.045 g/cm(3)) and thermal conductivity (0.040 W/m.K). This novel way of preparation allows us to overcome the fragile nature of MTMS based flexible silica aerogels while maintaining textural, physical, and functional properties. Hence such materials are highly useful for corrosion resistant thermal insulation in various fields. (C) 2017 Elsevier Ltd. All rights reserved.
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