水煮处理竹材的吸湿性和化学成分研究

doi:10.11707/j.1001-7488.20220113

Abstract

Abstract:

Objective: This paper was proposed to reveal the effects of boiling treatments on the hygroscopicity and chemical compositions of moso bamboo and provide technical references for bamboo modification. Method: The bamboo samples were treated in the boiling water (with the quality ratio of bamboo/water was 1∶100) for 4 h. The dynamic vapour sorption (DVS) was used to study the dynamic moisture adsorption curve, and the experimental data were analyzed by Hailwood-Horrobin(H-H) model. Meanwhile, the microstructure chemical compositions and crystal parameters of bamboo were investigated by scanning electron microscopy(SEM), Fourier transform infrared spectrometer(FTIR), X-ray photoelectron spectroscopy(XPS) and X-ray diffraction(XRD). Result: The results showed that the boiling-treated bamboo had lower equilibrium moisture contents(EMC) than those of the raw bamboo when the relative humidity(RH) was higher than 50%. The H-H model analysis showed that the monolayer moisture content increased, while the polymer moisture content decreased for the boiling-treated bamboo when the RH was higher than 35%. As indicated by SEM images, the parenchyma cell wall shrank after treatment, which decreased the number of micro-pores, and consequently decreased the polymer moisture content. Meanwhile, the hemicellulose was partially degraded as indicated by the chemical composition content analysis. The FTIR analysis showed that the OH, CO groups of boiling-treated bamboo increased, which increased the monolayer moisture content. The XPS results showed that the polysaccharose degraded, and the fatty acid, fat and phenols moved to the surface of bamboo. The XRD analysis indicated that the amorphous region was changed, while the width of crystallite in crystal region and the crystallinity increased. Conclusion: The sorption behavior of bamboo decreased after boiling treated for 4 h, whereas its dimensional stability was improved. The changes in the micro-morphology of bamboo cell wall and chemical compositions had great effects on the water sorption properties of bamboo.

Key words: moso bamboo, boiling treatment, dynamic vapour sorption, Hailwood-Horrobin(H-H)model

CLC Number:

S785

Shunong Li,Yamei Zhang,Yanglun Yu,Wenji Yu. Study on the Hygroscopicity and Chemical Compositions of Boiling-Treated Moso Bamboo[J]. Scientia Silvae Sinicae, 2022, 58(1): 119-126.

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材料Samples	H-H模型参数Parameters of the H-H model
材料Samples	W	K₁	K₂	R²
原竹Raw bamboo	324.18	1.26	0.78	0.999 69
水煮处理竹材Boiling-treated bamboo	262.34	1.12	0.67	0.999 73

材料Samples	综纤维素含量Holocellulose(%)	α-纤维素含量α-cellulose(%)	木素Lignin(%)
原竹Raw bamboo	68.25	41.42	22.03
水煮处理竹材Boiling-treated bamboo	65.88	41.37	23.11

材料Samples	I_{3 425}/I_{1 424}	I_{1 735}/I_{1 424}	I_{1 644}/I_{1 424}	I_{1 600}/I_{1 424}	I₁₂₄₇/I_{1 424}	I_{1 051}/I_{1 424}
原竹Raw bamboo	1.368	1.011	0.851	1.020	1.266	1.686
水煮处理竹材Boiling-treated bamboo	1.846	1.081	0.946	1.071	1.169	1.487

样品Sample	O/C	C1s
		C1		C2		C3
		BE/eV	RC(%)	BE/eV	RC(%)	BE/eV	RC(%)
原竹 Raw bamboo	0.50	284.78	34.26	286.48	55.12	288.30	10.62
水煮处理竹材 Boiling-treated bamboo	0.36	284.75	45.92	286.40	46.17	288.50	7.91

样品 Samples	衍射角 Diffraction angle (2θ)/(°)	半峰宽 Width at half of peak	结晶宽度 Crystal width / nm	层间距 Space between crystal layer/nm	结晶指数 Crystallization index(CrI)(%)
原竹 Raw bamboo	22.12	2.89	2.77	0.402	54.69
水煮处理竹材 Boiling-treated bamboo	22.11	2.75	2.91	0.402	56.66

Study on the Hygroscopicity and Chemical Compositions of Boiling-Treated Moso Bamboo

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