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熏蒸处理对落叶松木材颜色和力学强度的影响

王丹青 何静 张求慧

王丹青, 何静, 张求慧. 熏蒸处理对落叶松木材颜色和力学强度的影响[J]. 北京林业大学学报, 2017, 39(2): 100-107. doi: 10.13332/j.1000-1522.20160317
引用本文: 王丹青, 何静, 张求慧. 熏蒸处理对落叶松木材颜色和力学强度的影响[J]. 北京林业大学学报, 2017, 39(2): 100-107. doi: 10.13332/j.1000-1522.20160317
WANG Dan-qing, HE Jing, ZHANG Qiu-hui. Effects of fumigation treatment on wood color and mechanical strength of Larix gmelinii[J]. Journal of Beijing Forestry University, 2017, 39(2): 100-107. doi: 10.13332/j.1000-1522.20160317
Citation: WANG Dan-qing, HE Jing, ZHANG Qiu-hui. Effects of fumigation treatment on wood color and mechanical strength of Larix gmelinii[J]. Journal of Beijing Forestry University, 2017, 39(2): 100-107. doi: 10.13332/j.1000-1522.20160317

熏蒸处理对落叶松木材颜色和力学强度的影响

doi: 10.13332/j.1000-1522.20160317
基金项目: 

国家质检总局质检公益性行业科研专项 201410054-04

详细信息
    作者简介:

    王丹青。主要研究方向:木材科学。Email:932854672@qq.com  地址:100083 北京海淀区清华东路35号北京林业大学材料科学与技术学院

    责任作者:

    张求慧,教授,博士生导师。主要研究方向:包装材料。Email:qhzh66@163.com  地址:同上

  • 中图分类号: S482.6

Effects of fumigation treatment on wood color and mechanical strength of Larix gmelinii

  • 摘要: 为研究熏蒸处理对木材颜色和力学性能的影响,采用氧硫化碳(COS)、溴甲烷(MB)和硫酰氟(SF)分别在3种不同质量浓度下对落叶松材进行熏蒸处理,用色差分析、力学性能测试、电子扫描电镜(SEM)、能谱分析(EDS)和红外光谱分析(FTIR)对熏蒸前后木材的物理力学性能和官能团变化进行表征。结果发现:1)使用3种熏蒸剂处理后,落叶松材的颜色均发生明显变化,其中COS熏蒸处理对试样的明度(L*)、红绿轴色度指数(a*)的影响最小;2)落叶松材经过COS熏蒸处理后,顺纹抗压强度、静曲强度、弹性模量均下降,其中顺纹抗压强度下降最明显,在熏蒸剂质量浓度为124.2 g/m3时,顺纹抗压强度下降幅度达13.09%,而静曲强度和弹性模量分别下降9.38%、8.66%;经MB、SF熏蒸处理后,试样的顺纹抗压强度、静曲强度、弹性模量均无明显变化;3)熏蒸后的落叶松材表面微观结构未发生明显变化,但COS熏蒸后木材表面的S元素和SF熏蒸后木材表面的F元素分布密度均有所增加;4)在落叶松红外光谱图中,经MB、SF熏蒸后,碳氧双键和碳氢键明显增多;COS熏蒸后,半纤维素上的碳氧双键伸缩振动减弱,芳香环骨架上的碳氧双键的伸缩振动加强,木质素相对含量增加。

     

  • 图  1  熏蒸剂处理后落叶松的ΔEab*、ΔL*、Δa*、Δb*

    Figure  1.  ΔEab*, ΔL*, Δa* and Δb* values of larch after fumigation treatments

    图  2  熏蒸剂处理后落叶松材C*值的变化

    Figure  2.  Changes of C* value of larch after fumigation treatment

    图  3  熏蒸处理后落叶松材h*值的变化

    Figure  3.  Changes of h* value of larch after fumigation treatment

    图  4  熏蒸剂处理前后SEM形貌

    Figure  4.  SEM micro-topography of larch before and after fumigation treatment

    图  5  COS熏蒸处理前(a)和处理后(b)S元素的分布

    Figure  5.  S element distribution of larch before(a) and after(b) COS fumigation treatment

    图  6  MB熏蒸处理前(a)和处理后(b)Br元素的分布

    Figure  6.  Br element distribution of larch before(a) and after(b) MB fumigation treatment

    图  7  SF熏蒸处理前(a)和处理后(b)F元素的分布

    Figure  7.  element distribution of larch before(a) and after(b) SF fumigation treatment

    图  8  3种熏蒸剂处理后与未处理(CK)落叶松材红外谱图

    Figure  8.  FTIR spectroscopy of larch before and after fumigation treatment

    表  1  熏蒸处理前后落叶松力学强度变化

    Table  1.   Changes of mechanical strength of larch before and after fumigation treatment

    样品
    Sample
    顺纹抗压强度*
    Compressive strength
    parallel to grain/
    MPa
    顺纹抗压强度变化率**
    Change rate of
    compressive strength
    parallel to grain/%
    静曲强度*
    Static bending
    strength/MPa
    静曲强度变化率**
    Change rate of
    static bending
    strength/%
    弹性模量*
    Modulus of
    elasticity/
    MPa
    弹性模量变化率**
    Change rate of
    modulus of
    elasticity/%
    对照Control 46.61 80.50 7 400
    41.4 g/m3 COS 44.35 -4.85 79.13 -1.70 7 490 1.22
    82.8 g/m3 COS 43.77 -6.09 76.11 -5.45 7 087 -4.23
    124.2 g/m3 COS 40.51 -13.09 72.95 -9.38 6 759 -8.66
    41.4 g/m3 MB 46.20 -0.88 82.50 2.48 7 449 0.66
    82.8 g/m3MB 45.78 -1.78 81.59 1.35 7 340 -0.81
    124.2 g/m3 MB 45.34 -2.72 79.82 -0.84 7 246 -2.08
    41.4 g/m3 SF 45.36 -2.68 81.22 0.89 7 481 1.09
    82.8 g/m3 SF 45.19 -3.05 79.63 -1.08 7 219 -2.45
    124.2 g/m3 SF 44.81 -3.86 77.98 -3.13 7112 -3.89
    注:*为平均数。**正值表示增加,负值表示减少。Notes: * represents mean. Positive ** values mean rise, and negative ** values mean fall.
    下载: 导出CSV
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  • 收稿日期:  2016-09-30
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