Ultra-light, heat-resistant, flexible and thermal insulation graphene-fluororubber foam prepared by using N2 as a blowing agent

Developing light-weight fluororubber foam is a challenging task mainly because of its high density and the easy shrinkage of foam. A promising approach to overcome this challenge is the use of supercritical fluid (SCF) foaming method. Herein, an ultra-light, heat-resistant, and adiabatic fluororubber foam was developed through preparing fluororubber gel, followed by using eco-friendly supercritical nitrogen (SC N2) as blowing agent and the properties of prepared foam with different graphene content (0, 2, 4, 6, 8, 10 phr) were investigated. The developed fluororubber foam has the closed-cell structure as the general rubber foam and ultra-light property (i.e. density of 9 mg/cm3). Good flexibility and compressibility, as well as excellent heat resistance (foam can withstand at high temperature above 200 °C for which there is no obvious change in fluororubber foam) and thermal insulation (thermal conductivity in the range 0.020−0.032 W/mK) meet well the desirable properties for thermal insulation application, which supports fluororubber foams to be a promising material.

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