Preparation process optimization for Juncao scrimber via response surface methodology
Juncao resources are one of the most abundant agricultural resources in the world,which have broad pros-pects for development,but there is a lack of research for reasonable and effective application strategies.The response surface Box-Behnken design methodology was used to study the effects of different impregnation time,hot-pressing time and hot-pressing temperature on the main physical and mechanical properties of the Juncao(Arund donax cv.lvzhou No.1)scrimber.Based on the design methodology test results,alkali and brooming treatment were added to explore the different effect of modification on the surface structure and main physical and mechanical properties of the Juncao.The results showed that the best preparation process parameters were the impregnation time of 33 min,hot-pressing time of 1.12 min/mm and hot-pressing temperature of 155℃.With the decrease of the impregnation time,the modulus of rupture(MOR)and modulus of elasticity(MOE)of the broomed Juncao scrimber showed a parabolic change trend,with few changes in width swelling rate(WSR).The impregnation time of the broomed Juncao scrim-ber was reduced to 15 min.MOR and MOE were 136.56 MPa and 14.80 GPa,respectively,which were 154％and 14％higher than those of non-broomed Juncao scrimber.TSR and WSR were 5.84％and 0.93％,which were de-creased by 7 and 1.82 percentage points,respectively.Both properties met requirements of the standard GB/T 40247-2021"Bamboo scrimber".Brooming treatment enables the Juncao scrimber to have a denser laminated structure.The results of alkali treatment showed that MOR(143.13 MPa)and MOE(15.05 GPa)were the best when they were treated by the alkali solution with 2％NaOH mass ratio.The optimal TSR(1.85％)and WSR(0.30％)were ob-tainned at the solution with 1％NaOH mass ratio.Scanning electron microscope(SEM)analysis showed that the sur-face wax layer of Juncao was degraded and the roughness increased after the alkali treatment,and it did not have da-mage to the internal fibers of Juncao.After the brooming treatment,the phenol formaldehyde resin can penetrate the fiber inside the Juncao through the cracks generated.The cracks caused by brooming were conducive to the penetration of the phenolic resin into the interior of the Juncao,which was advantageous to the bonding of the Juncao scrimber and improved the main physical mechanical properties and water resistance.The Juncao scrimber prepared in this study provides a new way for the development of new Juncao materials and is of great significance to accelerate the develop-ment of the Juncao scrimber industry.
国家科技期刊平台
NSTL
万方数据
维普
