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ARTICLE

Study on the Bonding Performance of the Moso Bamboo Dowel Welded to a Poplar Substrate Joint by High-Speed Rotation

by Suxia Li^1,2, Haiyang Zhang^1,*, Biqing Shu^1,3, Liangsong Cheng¹, Zehui Ju¹, Xiaoning Lu^1,*

1 College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China
2 College of Furniture and Art Design, Central South University of Forestry and Technology, Changsha, 410004, China
3 College of Civil Engineering, Yangzhou Polytechnic Institute, Yangzhou, 225127, China

* Corresponding Authors: Haiyang Zhang. ; Xiaoning Lu. Email:

(This article belongs to the Special Issue: Renewable and Biosourced Adhesives)

Journal of Renewable Materials 2021, 9(7), 1225-1237. https://doi.org/10.32604/jrm.2021.014364

Received 21 September 2020; Accepted 11 November 2020; Issue published 18 March 2021

Abstract

The wood friction welding technique with its high bonding strength, low cost, high efficiency, and without any adhesive has been increasing concern in China. Moso bamboo (Phyllostachys pubescens) and poplar (Populus sp.) are widely planted and used in the furniture industry, interior decoration, and wood structure construction in China. The aim of this work was to investigate the bonding performance of moso bamboo dowel rotation welded joints with different dowel/receiving hole diameter ratios. The results indicated that the ratio of dowel/receiving hole diameter was an important parameter that influenced the welding performance. The bonding strength of the bamboo-to-poplar welded joints at the optimal ratio of 10/7 was as high as 7.50 MPa, which was higher than that of the beech (Fagus sylvatica, L.), schima (Schima superba) dowels and PVAc glued joints. The temperature measurement results showed a peak temperature of bamboo dowel welding as high as 350–360°C. Some differences in the temperature curves between each dowel/hole diameter ratio group were observed at the three different hole depths, such as the friction time, peak temperatures, and stabilization time at the maximum temperature, which could explain the differences in welding strengths between different ratios. The SEM results showed the temperature-induced softening, melting and flowing of cell-interconnected polymer material in the wood and bamboo structure. In addition, the bamboo fibers (mainly vascular bundles) were wrapped to form a dense continuous bonding layer, similar to the reinforced concrete, thus producing a good bonding effect. The Fourier transform-infrared spectroscopy (FT-IR) analyses showed that the high temperature resulted in the increase of the lignin relative content due to the degradation reaction of cellulose in the welding zone, which improved the bonding properties.

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