A cork-silica xerogel nanocomposite with unique properties

Garcia, Ana; Julio, M. F.; Ilharco, L. M.

http://hdl.handle.net/10400.1/13021

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Authors

Garcia, Ana

Julio, M. F.

Ilharco, L. M.

Abstract(s)

Taking advantage of the bonding between cork and silica xerogel, environmentally friendly nanocomposites are synthesized by a sol-gel process and dried at ambient pressure, with a superb combination of properties: densities near 600 kg m(-3), surface areas of 200 m(2) g(-1), mechanical strength up to 24 MPa, Shore D hardness up to 58 and, moreover, flame retardant. These properties are tunable by adjusting the synthesis parameters. The effects of cork granulometry and pre-swelling, and of the catalysis conditions are analyzed. Potential applications for these innovative nanocomposites are envisaged as replacement of thermoplastic polymers or hard wood, when non-flammability is desirable. The present approach opens a range of possibilities for developing unique composite materials that use natural and inexpensive raw resources and soft synthesis processes, with little energy requirements. [GRAPHICS]