Research On The Main Chemical Components, Physical And Mechanical Properties Of Bamboo After Thermal Treatment

This paper is to study on the changes of bamboo componets, physical and mechnical proerties before and after heat-treatment. An experiment was carried out with two main indexes, i.e. heat treatment temperature and treatment time. Those changes appeared under differents conditions were investigated in this thesis. The best heat treatment processes which can meet different demands were obtained after analyzing. The results show that:By heat treatment, complex chemical changes in bamboo were taken place. With the raise of heat treatment temperature and heat treatment time, cellulose and holocellulose contents descend, but lignin content ascends. It is very obvious that the main chemical components were affected by heat treatment temperature compared with untreated bamboo. For example, the cellulose content reduced 15.02%, holocellulose content reduced 29.08%, but lignin content increased 24.26%.After heat treatment, the density, shrinkage and swelling of bamboo descend with the raise of heat treatment temperature and heat treatment time. The affection of heat treatment temperature is significant and heat treatment time insignificant. The trend of the five main mechanical properties shows down forward as the heat treatment arises. Heat treatment temperature for the mechanical properties is significant, but heat treatment time for shearing strength parallel to grain is significant.For bamboo density and mechanical properties, the optimal heat treatment process is as follows: temperature 150℃, heat-treatment time 2h. For bamboo shrinkage and swelling, the optimal heat treatment process is as follows: temperature 210℃, heat-treatment time 4h.