The Research On Structure?Wood Properties And Modification Of Calamus Sp.

Rattan is a kind of important non wood biomass material, which is second only to wood and bamboo .Nowadays, forest protection and ecological civilization are becoming more and more important, and the status of rattan in industrial production has become more and more obvious.As a result of the implementation of restrictions on the export of rattan materials,Chinese enterprises are increasingly shortage of commercial rattan, is facing enormous pressure. At the same time, the mechanical properties of rattan often appear in the process of commercial use. Therefore, to strengthen the research on the basis and performance of non commercial rattan, through various means to improve the physical and mechanical properties of palm, has become a problem of scientific research workers and rattan processing enterprises.Because there is no uniform standard for the determination of rattan properties both here and abroad, this paper refers to wood, bamboo and other scholars.In this paper, the basic anatomical structure and physical mechanics properties of the powder were studied,Using high molecular weight phenolic resin?Low molecular weight phenolic resin and nano-SiO2 solution as modifier to treat original rattan by vacuum impregnation method.By using the orthogonal test to evaluate the change of physical and mechanical material properties, and by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) as a means to observe the change of rattan microstructure before and after, to explore its material enhancement mechanism. The research aimed to provide the basic data for the study of the basic material properties, the reinforcement modification treatment and the utilization of the nano material in the modification of rattan materials.The main conclusions are as follows:(1)Calamus sp. is a gradient material with large differences in the nature of core and cortex. Vascular bundles (Vbs) arrange tightly in cortex and sparsely in core, which only contain a phloem and a protoxylem vessel.The radial variation from the cortex to the core,ratio of fiber and vessel proportion is gradually decreased?ratio of sieve tube increased gradually, the parenchyma cells changed little ; fiber width and double wall thickness increased gradually, fiber length changes little, the fibers at the core and cortex are more longer; the vessel density was gradually decreased, and the length and diameter of the vessel tended to increase.(2)The basic physical and mechanical properties of rattan were improved after modification. Among them, the low molecular weight phenolic resin impregnated material has the best effect, although nano-SiO2 impregnated modified material is not as good as phenolic resin impregnated material in the physical and mechanical properties,its incomparable advantages are of great significance in industry and daily use.Through orthogonal test analysis, the best modification technology was determined that the impregnation material was low molecular weight phenolic resin,the impregnation amount was 55%,the curing temperature was about 140?,the curing time was 1h.(3)Using FITR and SEM to analyze Calamus sp. unmodified material?phenolic resin modified material and nano-SiO2 modified material,phenolic resin was mainly found in parenchyma cells, secondary xylem vessel and Phloem sieve tube.Because of the high viscosity of the high molecular weight phenolic resin,it's can just deposit at the surface of vessel & fiber,then low molecular weight phenolic resin can get into the cell wall of rattan(amorphous region mainly).The nano-SiO2 particles were distributed in the cell wall,cell cavity and interspace of the cell wall,and they were mainly adsorbed by physical adsorption.Phenolic resin and nano-SiO2 also had some chemical bonding with rattan group in the inner part.