Abstract
Viscoelasticity affects polymer behavior when the polymer undergoes deformation, creep, and plasticity. The viscoelasticity of the bamboo can be influenced by moisture content (MC), density, and radial positions. In this study, the effects of moisture contents (MCs) and radial positions on the dynamic viscoelastic behavior of Phyllostachys iridescens, which is a common furniture bamboo species, were investigated using dynamic thermomechanical analysis. The result showed that MC significantly affected on storage modulus, loss modulus, tan δ, and three kinds of glass transition temperatures which were denoted as Tg-E’, Tg-E’’, and Tg-loss respectively, compared with the radial position. With increasing MC, the storage modulus and Tg-loss decreased. Storage modulus decreased from 10,549 MPa at MC 0% to 1896 MPa at MC 80% when 50 ℃, Tg-loss decreased from 233 ℃ at MC 0% to 153 ℃ at MC 7%, 131 ℃ at MC 30%, and 99 ℃ at MC 80% respectively, which showed the increase of MC effectively decreased Tg-loss. As the bamboo wall position changed from yellow layer to middle and green layers, the storage modulus, tan δ, and loss modulus increased, while radial position affected little on Tg-loss. For all MCs and positions, Tg-E’ was higher than Tg-E′’, and the gap between Tg-E′ and Tg-E′’ decreased as MC increased. Tan δ mainly ranged from 0.03 to 0.09 for all MCs and radial positions, and the tan δ at MC 7% was the lowest. Radial positions affected tan δ, which in order of middle layer (0.085) ＞ green layer (0.074) ＞yellow layer (0.059). It showed two peaks on tan δ curve for the green layer, and the later one was 0.663 at 178 ℃, which indicating that green layer shifted to viscous state.
Published Version
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