熏蒸处理对大叶杨理化性能的影响  

The Effects of Fumigation Treatment on Physical and Chemical Properties of Populus Lasiocarpa Oliv.

作　　者：王丹青[1] 何静[1] 张求慧[1] 

机构地区：[1]北京林业大学,北京100083

出　　处：《包装工程》2017年第7期79-85,共7页Packaging Engineering

基　　金：国家质检总局质检公益性行业科研专项(201410054-04)

摘　　要：目的探讨质检熏蒸处理对大叶杨理化性能的影响。方法采用氧硫化碳(COS)、溴甲烷(MB)、硫酰氟(SF)3种不同的熏蒸剂,在不同浓度条件下对大叶杨进行熏蒸处理,并用色差分析、力学性能检测、扫描电镜、红外光谱分析等方法对熏蒸前后大叶杨的理化性能进行对比。结果使用3种熏蒸剂处理后,大叶杨材色均发生明显变化,其中COS熏蒸对大叶杨材色影响最小;经过COS熏蒸处理后,大叶杨木材的顺纹抗压强度、静曲强度、弹性模量均明显下降,在熏蒸剂质量浓度为124.2 g/m^3条件下,下降幅度达8%~12%;熏蒸处理后,大叶杨微观表面并没有发生明显变化;在大叶杨红外光谱图中,经MB和SF熏蒸处理后,1734 cm^(–1)处吸收峰明显加强,C=O键明显增多;COS处理后,1598,1510,1245 cm^(–1)处吸收峰强度均降低。结论熏蒸处理会使木质包装材料材色、力学性能发生变化,并在木材内部有明显残留,但是熏蒸剂与木材内化学物质的反应仍需进一步探讨。The work aims to study the effects of quality inspection of fumigation treatment on physical and chemical properties of poplar. Three kinds of fumigation agents （carbonyl sulfide （COS）, methyl bromide （MB） and sulfuryl fluo- ride （SF）） were used for fumigation treatment of Populus lasiocarpa Oliv. at different concentrations. Color difference analysis, mechanical property test, scanning electron microscope （SEM）, infrared spectroscopic analysis and other me- thods were used to compare the physical and chemical properties ofPopulus lasiocarpa Oliv. before and after fumigation treatment. After the treatment with three kinds of fumigation agents, the wood color of Populus lasiocarpa Oliv. was re- markably changed, in which COS fumigation treatment showed a minimum effect on wood discoloration. After COS fu- migation treatment, the parallel-to-grain compressive strength, static bending strength and elastic modulus of Populus la- siocarpa Oliv. wood decreased significantly. When the mass concentration of fumigation agent was 124.2 g/m3, the strength mechanics declined by up to 8%-12%. The surface fine structure of samples was maintained after the fumigation treatment. In the infrared spectrogram of Populus lasiocarpa Oliv., the absorption peak got obviously stronger at 1734 cm-1 after MB or SF fumigation treatment and C=O bond increased obviously. The absorption peak strengths were de- creased at 1598, 1510, 1245 cm-1 after COS fumigation treatment. Fumigation treatment will change the wood packaging material color and mechanical property, and obvious residues of fumigation agents stay inside the wood. However, the reaction of fumigation agents with the chemicals inside the wood still needs further discussion.

关 键 词：大叶杨 熏蒸剂 材色 扫描电镜 红外光谱 

分 类 号：S482.6[农业科学—农药学]