Abstract
In this work, cellulose fibres extracted from bamboo culms were used to fabricate two types of cellular materials: rigid foams and fibrous networks. A relatively simple and low-technology fabrication method is presented, using natural binders and blowing agents to manufacture rigid foams, and fibrillation by partial hydrolysis in H2SO4 to manufacture fibrous networks. The compressive response is related to the internal microstructure and processing parameters. In the case of fibrous networks, the achievable relative density range is determined by the length of initial fibres and extent of external fibrillation. The compressive properties are dictated both by the density of the network and strength of the fibrous bridges, showing a linear stiffness-density relationship due to the length of fibres, and an inverse relationship at increased external fibrillation. The rigid foams showed an orthotropic internal microstructure but nearly isotropic compressive response, due to the influence of the interpenetrating void structure on the deformation and fracture mechanisms. The results show the potential of bamboo-fibre porous materials as low cost, lightweight structural materials.
Highlights
Lightweight cellular solids, e.g. foams and fibrous networks, find wide use in weight-sensitive applications
Examples include fibre foams, where cellulose fibres are suspended in a binder of a secondary phase (Svagan et al 2011; Ottenhall et al 2018; Saz-Orozco et al 2013), which is subsequently blown with a foaming agent, and dried using freeze or critical point drying
Cellular solids were manufactured from cellulose fibres extracted from bamboo culms
Summary
Lightweight cellular solids, e.g. foams and fibrous networks, find wide use in weight-sensitive applications. Examples include fibre foams, where cellulose fibres are suspended in a binder of a secondary phase (Svagan et al 2011; Ottenhall et al 2018; Saz-Orozco et al 2013), which is subsequently blown with a foaming agent, and dried using freeze or critical point drying In such architectures, the fibres are dispersed in cell walls, and connected at the cell wall or nodal junctions (Alimadadi et al 2018). The sustainability of cellulose cellular solids depends largely on the primary source of fibres, and the energy consumption of the extraction and foaming processes. We use simple manufacturing methods to create low-density cellular solids from bamboo fibres, a source that has not been considered previously in the literature of cellulose foams. The compressive response is related to the governing deformation and failure mechanisms
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