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Licensed Unlicensed Requires Authentication Published by De Gruyter May 22, 2019

Variation of surface and bonding properties among four wood species induced by a high voltage electrostatic field (HVEF)

  • Qian He , Tianyi Zhan ORCID logo EMAIL logo , Haiyang Zhang , Zehui Ju , Lu Hong , Nicolas Brosse and Xiaoning Lu EMAIL logo
From the journal Holzforschung

Abstract

A high voltage electrostatic field (HVEF) was applied to enhance the bonding performance of wood composites prepared with phenol-formaldehyde (PF) adhesive and different wood species and radial cut combinations. Four wood species including Masson pine (Pinus massoniana), Chinese fir (Cunninghamia lanceolata), poplar (Populus tomentosa) and ayous (Triplochiton scleroxylon) were studied. The results of HVEF-treatment turn out to be species-dependent, and are related to the anatomical and chemical properties of wood. It was demonstrated by a statistical approach that the lignin content is the most significant parameter with a good correlation coefficient (R2 > 0.8). High lignin content leads to high free radical concentration at the wood surface and the HVEF enhanced the adhesive penetration depth, the maximal density and the bonding strength (Bst) at the interphase. On the contrary, high extract contents and large lumina diameters negatively impacted the surface modification by HVEF. The magnitude of the effects was in the following order: ayous < poplar < Masson pine < Chinese fir.

Acknowledgments

Some of the experiments were conducted in Advanced Analysis and Testing Center of Nanjing Forestry University.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The authors are grateful for funding support by the National Key R&D Program of China (2017YFC0703501). The study was financed by the Doctorate Fellowship Foundation of Nanjing Forestry University, the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX18_0962), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and the National First-class Disciplines. LERMAB is supported by the French National Research Agency through the Laboratory of Excellence ARBRE (ANR-12-LABXARBRE-01). QH would like to gratefully acknowledge the financial support from the China Scholarship Council (CSC).

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

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Received: 2018-08-29
Accepted: 2019-04-09
Published Online: 2019-05-22
Published in Print: 2019-08-27

©2019 Walter de Gruyter GmbH, Berlin/Boston

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