Impact of delignification on morphological, optical and mechanical properties of transparent wood

Wu, Jiamin; Wu, Yan; Yang, Feng; Tang, Caiyun; Huang, Qiongtao; Zhang, Jilei

doi:10.1016/j.compositesa.2018.12.004

Cited by 110 publications

(61 citation statements)

References 35 publications

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“…It can be seen that the absorption peaks of the DIB and DHIB samples disappeared at 1617 cm −1 , 1513 cm −1 , and 1460 cm −1 . This means that the lignin in IB and HIB is largely removed after the delignification method, which was mentioned in Section 2.2.2, Preparation of bamboo templates [27]. Curves 5 and 6 in Figure 2 represent the transparent inner bamboo (TIB) and transparent heat-treated inner bamboo (THIB) samples.…”

Section: Mechanical Strength Testingmentioning

confidence: 92%

Study on the Properties of Transparent Bamboo Prepared by Epoxy Resin Impregnation

Wang

Yang

et al. 2020

Polymers

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In this paper, Moso bamboo (Phyllostachys heterocycle) before and after heat treatment were used as raw materials to prepare transparent bamboo (TB). In an acidic environment, the lignin contained in the bamboo material was removed to obtain a bamboo template, and an epoxy resin similar to the cellulose refractive index was used for vacuum impregnation into the bamboo template to obtain a transparent bamboo material. The purpose of this study was to compare the physical and chemical properties of TB and original bamboo and the differences between TBs before and after heat treatment, taken from different parts of bamboo, in order to explore the performance advantages and disadvantages of TB as a new material. The Fourier transform infrared spectroscopy analysis (FTIR), scanning electron microscope testing (SEM), three elements analysis, light transmittance testing, and mechanical strength testing were used to study the molecular composition, microstructure, chemical composition, light transmittance, and tensile strength of the TB samples. The results showed that the lignin content of the delignified bamboo templates was greatly reduced. In addition, the SEM images showed that a large amount of epoxy resin (type E51 and type B210 curing agent) was covered on the cross-section surface and pores of the TB samples. The FTIR showed that the epoxy molecular groups appeared on the TB, and the delignified bamboo template and the resin had a good synergy effect. According to the light transmittance testing, the original bamboo samples hardly contained light transmittance under visible light. The transmittance of transparent inner bamboo (TIB) and transparent heat-treated inner bamboo (THIB) could reach about 11%, and the transmittance of transparent outer bamboo (TOB) and transparent heat-treated outer bamboo (THOB) was about 2%. The light transmittance had been significantly improved when compared with the original bamboo samples. The transmittances of the TB samples before and after heat treatment in different parts of bamboo were different. In the visible light irradiation range, the light transmittances of TB samples were as follows: TIB > THIB and THOB > TOB. Meanwhile, the tensile strength of TB was reduced, especially for TOB and THOB. In addition, TB has a wide range of raw materials, and the preparation process is environmentally friendly. It can be used for decorative materials in homes, buildings, etc., and has a great application potential.

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Section: Mechanical Strength Testingmentioning

confidence: 92%

Study on the Properties of Transparent Bamboo Prepared by Epoxy Resin Impregnation

Wang

Yang

et al. 2020

Polymers

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“…Liu et al (2001) and Shen et al (2005) studied the effects of Picea genera wood growth rings on its sound vibration properties. Ma (2005) and Wu et al (2019aWu et al ( , 2019b analyzed the effects of the anatomical structure of wood as a porous material on its acoustic vibration properties. Shen et al (2001) investigated the effects of Picea genera wood densities on their longitudinal and radial loss tangents.…”

Section: (Received May 2019)mentioning

confidence: 99%

Effect of Coating Thickness on Sound Absorption Property of Four Wood Species Commonly Used for Piano Soundboards

Xu¹,

Fang²,

Han³

et al. 2020

WFS

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“…The color reader (PANTONE) was used to measure the color difference between Betula alnoides and New Zealand pine OW, TW samples, and the changes and causes of wood color before and after the experiment were compared and analyzed [18]. The color of each tree species sample is kept as consistent as possible to reduce the test error.…”

Section: Color Difference Testmentioning

confidence: 99%

Study on the Properties of Partially Transparent Wood under Different Delignification Processes

Zhou

Huang³

et al. 2020

Polymers

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Two common tree species of Betula alnoides (Betula) and New Zealand pine (Pinups radiata D. Don) were selected as the raw materials to prepare for the partially transparent wood (TW) in this study. Although the sample is transparent in a broad sense, it has color and pattern, so it is not absolutely colorless and transparent, and is therefore called partially transparent. For ease of interpretation, the following "partially transparent wood" is referred to as "transparent wood (TW)". The wood template (FW) was prepared by removing part of the lignin with the acid delignification method, and then the transparent wood was obtained by impregnating the wood template with a refractive-index-matched resin. The goal of this study is to achieve transparency of the wood (the light transmittance of the prepared transparent wood should be improved as much as possible) by exploring the partial delignification process of different tree species on the basis of retaining the aesthetics, texture and mechanical strength of the original wood. Therefore, in the process of removing partial lignin by the acid delignification method, the orthogonal test method was used to explore the better process conditions for the preparation of transparent wood. The tests of color difference, light transmittance, porosity, microstructure, chemical groups, mechanical strength were carried out on the wood templates and transparent wood under different experimental conditions. In addition, through the three major elements (lignin, cellulose, hemicellulose) test and orthogonal range analysis method, the influence of each process factor on the lignin removal of each tree species was obtained. It was finally obtained that the two tree species acquired the highest light transmittance at the experimental level 9 (process parameters: NaClO 2 concentration 1 wt%, 90 • C, 1.5 h); and the transparent wood retained most of the color and texture of the original wood under partial delignification up to 4.84-11.07%, while the mechanical strength with 57.76% improved and light transmittance with 14.14% higher than these properties of the original wood at most. In addition, the wood template and resin have a good synergy effect from multifaceted analysis, which showed that this kind of transparent wood has the potential to become the functional decorative material.

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Impact of delignification on morphological, optical and mechanical properties of transparent wood

Cited by 110 publications

References 35 publications

Study on the Properties of Transparent Bamboo Prepared by Epoxy Resin Impregnation

Study on the Properties of Transparent Bamboo Prepared by Epoxy Resin Impregnation

Effect of Coating Thickness on Sound Absorption Property of Four Wood Species Commonly Used for Piano Soundboards

Study on the Properties of Partially Transparent Wood under Different Delignification Processes

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