Chemical composition of grapevine and properties of grapevine/wood particleboard
In China,up to 6 million tons of grapevines are produced each year,and most of them are discarded in the fields,resulting in creation of tremendous wastes.Given the growing scarcity of wood resources,it is imperative to u-tilize these waste biomass raw materials more efficiently.In order to explore the application of grapevine chips in the production of wood-based panel,this study investigated the effects of the amount of grapevine chips,adhesive dosage and introduction of plasma pretreatment technology on the performance of particleboards.The results indicated that the performance of particleboards decreased when more grapevine chips were added due to their poor performance of bonding with wood shavings,resulting in the increase of internal pores and defects in the panels.When the content of grapevine chips reached 25%,the static bending strength,elastic modulus,and internal bonding strength of grapevine/wood particleboards decreased by 35.9%,35.0%and 13.1%,respectively.Additionally,the water absorp-tion thickness swelling rate was increased by 31.2%.In order to solve the problem of the decline of the properties of particleboards,this study explored the influence of different adhesive dosage on the properties of particleboards.The results showed that the increase in the amount of adhesive can improve the properties of the panels.In addition,con-sidering that the hydrophobicity of grapevine surface was not conducive to the penetration of glue in the shavings,plasma was used to treat the surface of grapevine chips.The experimental results showed that,after plasma modifica-tion,the surface roughness of grapevine was increased,which was confirmed by the scanning electron microscope(SEM)observation,and the X-ray photoelectron spectrometer(XPS)was used to analyze the surface of grapevine particles after the treatment.It was found that a large number of oxygen-containing groups were grafted on the surface of grapevine and the wettability of grapevine was improved,enhancing the absorption of glue solution.Compared with the unmodified grapevine/wood particleboards,the pressed grapevine/wood particleboards exhibited a 23.0%increase in static bending strength,a 21.6%increase in elastic modulus,and a 10.7%increase in internal bonding strength when the content of adhesive was 10%.Similarly,when the content of adhesive was 14%,the increases were 17.4%,11.8%and 7.4%,respectively.This result indicated that plasma modification had a more significant effect at a low ad-hesive content.After the plasma treatment,the combination of grapevine chips and wood shavings led to a more com-pact structure and reduced water intrusion pathways,this resulted in a reduction of water absorption thickness swelling rates from 9.32%and 6.85%to 8.68%and 5.86%,respectively.
万方数据
维普
