Abstract
In this work, bleached and unbleached micro/nanocellulose crystals (MNCC) were successfully extracted from raw banana fibre through a mechanochemical cellulose extraction method and integrated with fumed silica-based Vacuum Insulation Panel (VIP) core as a filler material. Both types of extracted MNCC were characterised for structural changes, chemical composition and thermal properties associated with insulation purpose. Thermal stability, specific heat capacity, thermal diffusivity and thermal conductivity were measured for both MNCC and compared with the commercially available Microcrystalline Cellulose (MCC). The effect of both MNCC on thermal conductivity of VIP was compared. The characterisation results concluded that the effect of the bleaching process in MNCC extraction was observed in particle size, crystallinity index, thermal diffusivity and thermal conductivity. VIP made with bleached MNCC showed lower thermal conductivity than unbleached MNCC. It was concluded that bleached MNCC extract would be comparatively a better filler material for VIP.
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