Abstract
In this study, the effects of tung oil heat treatment on the physico-mechanical properties of moso bamboo were investigated. Here, heat treatment in tung oil at 100–200 °C was used to modify natural bamboo materials. The changes in the nanostructures of cell walls in bamboo caused by oil heat treatment, like density, chemical compositions, and cellulose crystalline, were evaluated to study their correlation with mechanical properties. Results showed that the mechanical performance of bamboo, such as ultimate stress, modulus of elasticity (MOE), and modulus of rupture (MOR), didn’t reduce after heat treatment below 200 °C, compared with the untreated bamboo, which was mainly due to the tung oil uptake, stable cellulose content, and the increment of cellulose crystalline. No remarkable change in the ultimate strain occurred for bamboo materials thermally treated below 140 °C, but it decreased obviously at the heating temperature over 180 °C, mainly due to the degradation of hemicellulose resulting in a decrease in the viscoelasticity of cell wall.
Highlights
Bamboo is one of the most abundant biomass resources, which has advantages, such as short growth cycle, lightweight, and good mechanical property [1,2]
Yang et al reported that modulus of elasticity (MOE) and modulus of rupture (MOR) of moso bamboo would decrease after heat treatment in linseed oil over 150 ◦ C for 2 h [13]
This work examines the mechanical properties of moso bamboo after tung oil heat treatment, and their influencing factors, such as density, chemical compositions, and cellulose crystalline
Summary
Bamboo is one of the most abundant biomass resources, which has advantages, such as short growth cycle, lightweight, and good mechanical property [1,2]. From the cost-effective, eco-friendly, and sustainable chemistry standpoint, oil heat treatment is considered to be one of the most effective approaches to ameliorate these drawbacks of bamboo materials, so it shows a great potential application in treating bamboo materials in the industry. It remained the focus of controversy whether oil heat treatment would cause adverse effects on mechanical properties of wood or bamboo. Several studies found that oil heat treatment of wood and bamboo would result in a decrease in mechanical strength.
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