Millimeter-Size Spherical Polyurea Aerogel Beads with Narrow Size Distribution.

ABSTRACT: We report the room temperature synthesis of spherical millimeter-size polyurea (PUA) aerogel beads. Wet-gels of said beads were obtained by dripping a propylene carbonate solution of an aliphatic triisocyanate based on isocyanurate nodes into a mixture of ethylenediamine and heavy mineral oil. Drying the resulting wet spherical gels with supercritical fluid (SCF) CO₂ afforded spherical aerogel beads with a mean diameter of 2.7 mm, and a narrow size distribution (full width at half maximum: 0.4 mm). Spherical PUA aerogel beads had low density (0.166 ± 0.001 g cm^⁻3), high porosity (87% v/v) and high surface area (197 m² g^⁻1). IR, ¹H magic angle spinning (MAS) and ¹³C cross-polarization magic angle spinning (CPMAS) NMR showed the characteristic p

SUBMITTER: Chriti D 

PROVIDER: S-EPMC6209287 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature