Optimization Of Plasma Treatment Of Bamboo And Application In Bamboo Scrimber

An important approach is to solve the shortage of raw material in wood-based panel by developing bamboo scrimber, but the bamboo skin and pith are removed in the production process of bamboo scrimber because their bonding performance are poor. In this thesis, bamboo surface (carbonized and non-carbonized) were treated by plasma. The contact angle of bamboo surface was investigated through single factor (processing gas, the pressure of gas, processing time and processing power) and the timeliness of the plasma treatment was studied. According to the principle of Response Surface Methodology (RSM), the factors of plasma treated in carbonized bamboo were optimized by the Box-behnken. Then, a method of using plasma technology to produce bamboo scrimber was developed. Finally, this paper analyzed the surface components and morphology of bamboo by FT-IR and ESEM for exploring the mechanism of plasma treatment increased the surface wettability of bamboo. The results were concluded as following:(1) Carbonized could make the bamboo surface wettability and bond performance decreased. The effect of carbonized bamboo plasma treatment is better than non-carbonized. The best effect of plasma treatment was for the bamboo skin, and the effect for bamboo pith was the second, but the effect for bamboo pulp is not obvious. The oxygen had best effect by plasma treatment. There is a little influence on bamboo surface wettability of plasma treatment if the gas pressure within the operating range. As the processing time or power increases, the bamboo surface wettability first increases and then decreases. The effect retention time of the plasma treatment in carbonized bamboo was longer than non-carbonized bamboo, at the same time there was3days for keeping the plasma treatment effect for the carbonized bamboo, and there was5days for keeping the plasma treatment effect for the non-carbonized bamboo.(2) Carbonized bamboo is treated by plasma on the RSM, and it is concluded when MOR of bamboo scrimber was tested that the best process conditions included processing time of103s, processing power of141w, gas pressure of38Pa under the oxygen plasma treatment. Under the best process conditions, the MOR of bamboo scrimber is169.9MPa, and it rose46.7percent over the scrimber made of untreated bamboo.(3) The effect of carbonized bamboo plasma treatment is better than non-carbonized using the MOR of bamboo scrimber as indicator. When bamboo skin and pith were removed, plasma treatment and carbonized bamboo are little influent on the MOE of bamboo scrimber. The surface layer of these bamboo scrimber are carbonized and removed bamboo skin and pith and the core layer are non-carbonized and un-removed bamboo skin and pith. It could find that the thickness swelling and MOE of the bamboo scrimber are closed with all in carbonized and removed bamboo skin and pith, however, and MOR of the bamboo scrimber could be increased by27.1%. A method of using plasma technology to produce bamboo scrimber is developed.(4) By FT-IR analyses the characteristics peaks of bamboo surface appear before and after the oxygen plasma treatment and peak area are relative changed in carbonized bamboo, but there are not changed in non-carbonized bamboo. By ESEM analysis oxygen plasma treatment can etching and bring about cracks or collapses on bamboo surface.