Fei WANG; Junliang LIU; Wenhua LYU

doi:10.21967/jbb.v4i1.182

doi: 10.21967/jbb.v4i1.182

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出版历程
- 收稿日期: 2018-10-20
- 录用日期: 2018-12-11
- 刊出日期: 2019-01-01

Effect of Boron Compounds on Properties of Chinese Fir Wood Treated with PMUF Resin

1.
College of Forestry, Henan Agriculture University, Zhengzhou 450002, China
2.
Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China

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Corresponding author: Fei WANG, wangfeicaf@163.com

摘要

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Abstract: Plantation Chinese fir wood was modified by low molecular weight phenol melamine urea formaldehyde (PMUF) resin and boron compounds (BB) through a progressive gradual infiltration process. The results showed that the limiting oxygen index (LOI) values, density, dimensional stability and static flexural properties of the PMUF resin treated wood gradually improved with the increase of resin solid content. When boron compounds were additionally introduced into the PMUF resin, the density and the LOI values of the samples of compound modification increased, whereas the anti-swelling efficiency, the modulus of rupture and impact toughness decreased by more than 17.6%, 10.1% and 42.9%, respectively. It was demonstrated by X-ray diffraction and Fourier transform infrared spectroscopy that boron compounds could improve the crystallinity of resin modified samples and did not have a chemical reaction with resin or wood. Scanning electron microscope analysis indicated boron compounds made the microstructure of the resin polymers loose, influencing the mechanical properties and dimensional stability of resin modified wood.
- wood /
- resin /
- boron compounds /
- dimensional stability /
- mechanical properties

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Figure 1. Progressive pressurized impregnation curve

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Figure 2. Limiting oxygen index of the untreated and modified wood samples

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Figure 3. The MOR and MOE of untreated and modified wood samples

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Figure 4. Impact toughness of the untreated and modified wood samples

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Figure 5. Water uptake of untreated and modified wood samples

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Figure 6. Anti-swelling efficiency of untreated and modified wood samples

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Figure 7. The XRD curves of untreated and modified wood samples

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Figure 8. The FT-IR spectra of the untreated and modified wood samples

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Figure 9. The SEM images of radial section of P30 and PB30 wood samples: (a) P30, (b) PB30, (c) and (d) magnification of PB30

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Table 1. Physical properties of untreated and modified wood samples

Sample	PMUF (wt%)	BA+BX (wt%)	AD (%)	WPG (%)	Density (g/cm³)
Untreated	0	0	-	-	0.366±0.016
BB	0	6	225.5±8.6	9.2±0.5	0.401±0.015
P10	10	0	253.5±10.3	29.5±1.3	0.435±0.014
P20	20	0	261.7±13.9	59.6±2.9	0.529±0.013
P30	30	0	255.1±10.2	79.0±2.9	0.602±0.010
PB10	10	6	259.2±11.3	37.2±1.6	0.467±0.010
PB20	20	6	267.9±14.3	66.3±3.4	0.557±0.010
PB30	30	6	253.2±11.7	88.3±3.7	0.643±0.017
Notes: BA+BX is 2% boric acid + 4% borax; AD is absorption dose; WPG is weight percent gain; BB is boron compounds modified; P10, P20 and P30 are 10%, 20% and 30% solid content PMUF modified; PB10, PB20 and PB30 are 10%, 20% and 30% solid content PMUF with boron compounds modified. The same below.

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