改性松香对速生杨木性能提升的研究

doi:10.3969/j.issn.0253-2417.2020.02.007

Abstract

Abstract:

The tricyclic diterpene structure of rosin has unique properties. The fast-growing poplar was modified by using the refined rosin(RR), polymerized rosin(PR) and acrylic acid rosin(AAR) as madifier and ethanol as solvent to prepare the impregnating solution with the mass fraction of 20%. The fast-growing poplar was modified by impregnation method to obtain refined rosin modified wood (RRMW), polymerized rosin modified wood (PRMW), acrylic acid rosin modified wood (AARMW), and impregnated with absolute ethanol to obtain control wood (CW). The structure of the modified materials was characterized by infrared spectroscopy (FT-IR), scanning electron microscope (SEM), confocal laser scanning microscope (CLSM) and X-ray diffraction (XRD). The water resistance and mechanical properties of the modified materials were tested. The results showed that the C[FY=, 1]O absorption peak of the FT-IR for the modified material was significantly enhanced at 1691 cm^-1. XRD analysis showed that the crystal plane diffraction peak had no obvious change. It was clearly observed in the SEM and CLSM images that the rosin was deposited in the wood cell lumen and infiltrated into the wood cell wall, which indicated that the modified rosin entered the wood cells, but had no effect on the structure of wood cellulose. The results of performance test showed that the properties of the three kinds of modified wood were improved, and the improvement of acrylic acid rosin modified wood was the most significant. The water resistance of AARMW was significantly enhanced, and the water uptake rate was 79.68%, while that of the control wood was 186.28% after 12 days of impregnation. The contact angle of AARMW was 88.78° in 180s, which was only 12% lower than 100.09° in 15s. However, the contract angle of control wood decreased from 44.34° at 15s to 0° at 180 s. In addition, compared with the control wood, the modulus of rupture (MOR), modulus of elasticity (MOE), and compression strength (CS) of AARMW increased by 18.09%, 27.51% and 17.85% respectively, which showed that the mechanical properties of fast-growing poplar were obviously improved.

Key words: fast-growing poplar, modified rosin, impregnation modification, water resistance, mechanical properties

CLC Number:

TQ35

Ji XU,Zhaolan ZHAI,Xinyan YAN,Zhanqian SONG,Shibin SHANG,Xiaoping RAO. Improvement of Properties of Fast-growing Poplar by Modified Rosin[J]. Chemistry and Industry of Forest Products, 2020, 40(2): 55-62.

Figures/Tables 8

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References 20

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样品 samples	密度density/(g·cm^-3)		增重率/% weight gain rate (Y_WPG)	增容率/% bulking efficient (Y_BE)	体积膨胀系数/% volume expansion coefficient(S)	抗胀缩率/% antiswelling efficient (Y_ASE)
样品 samples	改性前 pre-modification	改性后 post-modification	增重率/% weight gain rate (Y_WPG)	增容率/% bulking efficient (Y_BE)	体积膨胀系数/% volume expansion coefficient(S)	抗胀缩率/% antiswelling efficient (Y_ASE)
对照control	0.393±0.005	0.388±0.005	—	—	10.76±0.07	—
RRMW	0.409±0.003	0.527±0.004	31.89±0.71	2.47±0.21	9.52±0.20	11.45±1.85
PRMW	0.414±0.004	0.531±0.005	31.22±0.93	2.23±0.30	8.99±0.09	16.39±0.81
AARMW	0.421±0.012	0.537±0.015	30.79±0.61	2.54±0.16	9.03±0.29	16.02±2.72

样品 samples	静曲强度/MPa modulus of rupture (MOR)	弹性模量/GPa modulus of elasticty (MOE)	顺纹抗压强度/MPa compression strength parallel to grain(CS)
对照control	71.58±5.26	6.07±0.62	59.43±6.76
RRMW	77.26±3.71	7.31±0.79	67.73±0.85
PRMW	83.81±3.89	7.14±0.49	65.85±2.48
AARMW	84.53±6.67	7.74±0.48	70.04±0.84

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Improvement of Properties of Fast-growing Poplar by Modified Rosin

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