Properties of a formaldehyde-free tannin adhesive and mechanical strength of oriented bamboo scrimber board bonded with it-Reference-Cited by-同舟云学术

Properties of a formaldehyde-free tannin adhesive and mechanical strength of oriented bamboo scrimber board bonded with it

Published:2020-06-24 Issue:1 Volume:75 Page:91-100
ISSN:1437-434X
Container-title:Holzforschung
language:en
Short-container-title:

Author:

Chung Min-Jay¹,Chang Tzu-Cheng²,Chang Shang-Tzen³,Wang Sheng-Yang⁴⁵

Affiliation:

1. Experimental Forest , National Taiwan University , Nantou , Taiwan, ROC

2. Department of Forestry and Natural Resources , Nationl I-lan University , Ilan , Taiwan, ROC

3. School of Forestry and Resource Conservation , National Taiwan University , Taipei , Taiwan, ROC

4. Agricultural Biotechnology Research Center , Academia Sinica , Taipei , Taiwan, ROC

5. Department of Forestry , National Chung-Hsing University , 250, Kuo-Kuang Rd., Taichung 402 , Taipei , Taiwan, ROC

Abstract

Abstract In this study, oriented bamboo scrimber board (OBSB) was manufactured with a synthesized formaldehyde-free tannin adhesive. The chemical properties of the tannin adhesive were analyzed with 13C nuclear magnetic resonance spectroscopy (13C-NMR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFT). Results revealed that 70% aqueous acetone extractives of Acacia confusa bark (AcBAE) contained abundant phenolic compounds and condensed tannins comprising mainly B-type flavonoid bonds. Moreover, cross polarization magic angle spinning (CP/MAS) 13C-NMR mapping of cured Acacia confusa bark tannin glue (AcBTanGlu) revealed that condensed tannin reacted with hexamethylenetetramine to form a polymer with a cross-link structure through a polymerization mechanism. According to the results obtained from gas chromatography-flame ionization detector (GC-FID) analysis, no formaldehyde was emitted from AcBTanGlu-glued OBSB. Thermogravimetric analysis indicated that AcBTanGlu significantly improved the thermal stability of AcBAE after the curing reaction. Comparison of the DRIFT spectra of bamboos before and after AcBTanGlu-glued treatment indicated AcBTanGlu did not impact the chemical functional properties of the bamboo. Compared to phenol formaldehyde (PF) and urea formaldehyde (UF)-glued OBSBs, AcBTanGlu-glued OBSBs statistically had lower modulus of elasticity (MOE) and modulus of rupture (MOR). As for the nail withdraw resistance, AcBTanGlu-glued OBSBs are statistically comparable to PF-glued OBSBs and higher than UF-glued OBSBs.

Funder

The Experimental Forest, College of Bioresource and Agriculture, National Taiwan University, Taiwan.

Publisher

Walter de Gruyter GmbH

Subject

Biomaterials

Link

https://www.degruyter.com/document/doi/10.1515/hf-2019-0267/pdf

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