等离子体处理对高温干燥杨木单板表面性能的影响  

Effect of plasma treatment on surface properties of high temperature dried poplar veneers

作　　者：NGUYEN Thiphuong 陈卫民 曹倚中 陈敏智 周晓燕 NGUYEN Quangtrung NGUYEN Hongminh 

机构地区：[1]南京林业大学材料科学与工程学院,南京210037 [2]越南林业科学院木材工业研究所,河内100803

出　　处：《林业工程学报》2017年第6期15-20,共6页Journal of Forestry Engineering

基　　金：国家重点研发计划(2016YFD0600702);林业科技成果国家级推广项目([2016]42);江苏省“333工程”资助科研项目(BRA2016381);江苏省科技厅前瞻性联合研究项目(BY2016006-03);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：单板在高温干燥条件下表面会发生钝化,表面活性下降,从而影响胶合性能。利用常压低温等离子体处理高温干燥杨木单板,以改善其表面特性,提高胶合性能。主要研究了等离子体处理功率和处理速率对高温干燥杨木单板表面特性及界面胶合性能的影响。研究结果表明:等离子体处理可明显提高单板表面的润湿性,当处理功率为4.5 k W、处理速率为2 m/min时,脲醛树脂胶和酚醛树脂胶在杨木单板表面的初始接触角和平衡接触角分别降低了18.2%,17.8%和40.4%,38.8%,脲醛树脂和酚醛树脂胶所制胶合板的胶合剪切强度分别增加了56.0%和51.5%。等离子体处理后脲醛树脂在高温干燥杨木单板所制胶合板的胶合界面中的渗透深度明显提高,胶合界面的平均渗透深度和有效渗透深度增幅分别为80.0%和61.9%。等离子体处理后,高温干燥杨木单板表面羰基数量有所增加。Through the high temperature drying,poplar veneer surfaces can undergo passivation and the surface activity of poplar veneer reduced. As a result,the plywood bonding strength was affected. In this paper,the atmospheric cold plasma was used to modify poplar veneer surfaces for better surface properties and bonding performance. The plywood was prepared by using the veneers that were high-temperature-dried and then plasma-treated. Two main parameters of plasma modification,i.e.,plasma processing rate and plasma processing power were adjusted for studying the influence on surface properties of poplar veneers and bonding strength of the modified plywood. The results showed that the plasma treatment can significantly improve the wettability of poplar veneer surfaces. The initial contact angle and equilibrium contact angle of urea-formaldehyde（ UF） resin decreased by 18. 2% and 17. 8% when plasma processing pow-er and processing rate were set to 4. 5 k W and 2 m/min,respectively. While the initial contact angle and equilibrium contact angle of phenol-formaldehyde（ PF） resin decreased by 40.4% and 38.8%,respectively. Correspondingly,the bonding strength of the plywood prepared by UF and PF resin increased by 56. 0% and 51. 5%,respectively. The results of further analysis showed that the content of carbonyl on plasma treated high-temperature-dried poplar veneer surfaces increased slightly. After the plasma treatment,the penetration depth of resin into high-temperature-dried poplar veneer significantly increased as well. The average penetration depth of the UF resin into interface increased by80. 0%,while the effective penetration depth of bonding interface increased by 61. 9%. After the plasma treatment,the amount of carbonyl on the surface of high temperature dried poplar veneers was increased.

关 键 词：高温干燥 常压低温等离子体 胶合板 表面性能 

分 类 号：S781[农业科学—木材科学与技术]