Thermal and mechanical performances of bamboo strip
Abstract
Bamboo strips extracted from Phyllostachys viridiglaucescens, grown in Europe, were analysed to
assess their thermal and mechanical properties for composites application. Thermal stability of the
European bamboo was studied by Thermogravimetric Analysis (TGA) and compared to the one of
species grown in Oceania. An evolution of the chemical composition along the radial direction of the
Phyllostachys bamboo was identified by TGA. The inner part of culms shows a higher proportion of
hemicelluloses, while the percentage of crystalline cellulose is higher in the outer portion. This
evolution of the composition was used to interpret the original data recorded by Dynamic Mechanical
Analysis (DMA) of the strips. Glassy tensile modulus founded byDMAincreases from the inner part
of the culm (6.8 GPa) to the outer part (9.9 GPa). The variation of the cellulose content along the
radius of the bamboo culm is related to this increase and shows a good correlation with thermal
behaviour. The dynamic relaxations in the shear mode reveal the existence of two secondary relaxation
modes sensitive to water. In the order of increasing temperatures, they have been assigned to the
mobility of methylol groups and to heterogeneities of the polymeric matrix. By combining Differential
Scanning Calorimetry (DSC) and DMA, the response of the viscoelastic transition of bamboo strips, at
210 °C, was evidenced for the first time. Bamboo strips behave as a unidirectional composite
reinforced by technical fibres; its particularly high shear glassy modulus (2.3 GPa) deserves to be
emphasised.
Domains
Materials
Origin : Files produced by the author(s)