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Development of an industrial applicable dielectric barrier discharge (DBD) plasma treatment for improving bondability of poplar veneer

  • Minzhi Chen , Rong Zhang , Lijuan Tang , Xiaoyan Zhou EMAIL logo , Yang Li and Xuehui Yang
Published/Copyright: December 2, 2015
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Abstract

Dielectric barrier discharge (DBD) plasma treatment in a larger scale, which has the potential for industrial application, was studied for modification of poplar veneer surface for enhancing its interface adhesion. Chemical property, morphology, surface wetting, adhesion property and the stability of the activation after plasma treatment were investigated. ESR, XPS, AFM, contact angle (CA), and shear strength test were carried out to evaluate the effect of plasma treatment. The following properties increased after treatment: the surface free radical concentration, O/C ratio, surface roughness of wood fiber, veneer surface wetting, and surface free energy. Consequently, the plywood composite prepared after plasma treatment showed higher adhesion strength than that prepared from untreated veneer. The best plywoods were obtained from veneers treated at processing power of 4.5 kW of DBD. The time-dependent analysis by surface wetting indicated a modified stability in the first two days after plasma treatment, after which the polar component of the surface decreased and its dispersive component kept the level observed after plasma treatment. In summary, veneer surface modification by DBD plasma is promising for industrial application.


Corresponding author: Xiaoyan Zhou, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China, Phone: +86 25 8542 8506, Fax: +86 25 8542 8517, e-mail:

Acknowledgments

The authors are indebted to the following organizations for their financial support: the National Department Public Benefit Research Foundation of China (Grant No. 201304507), the National Natural Science Foundation of China (Grant No. 31270606 and 31400515), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). Also this paper was sponsored by Qing Lan Project. Sincere thanks go to Jiangsu Engineering Research Center of Fast-growing Trees and Agri-fiber Materials for providing equipment for this study.

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Received: 2015-5-22
Accepted: 2015-11-1
Published Online: 2015-12-2
Published in Print: 2016-7-1

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