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浸渍热处理对杨木微观结构及尺寸稳定性的影响
吴美卉,赵晨鹏,蔡家斌,金菊婉,孙照斌
0
(南京林业大学材料科学与工程学院,南京 210037;南京林业大学材料科学与工程学院,南京 210037; 江苏省林业资源高效加工利用协同创新中心,南京 210037;河北农业大学林学院,保定 071001)
摘要:
为扩大速生杨木板材应用范围,采用脲醛树脂浸渍改性杨木,并对浸渍材和素材进行热处理,对杨木素材、浸渍材、不同热处理温度的联合改性材及热处理材的微观结构及湿胀性、吸水性和干缩性等尺寸稳定性进行对比分析。结果表明:杨木经浸渍处理后,树脂填充于导管、木纤维、木射线、纹孔及细胞角隅,并进入细胞壁;浸渍材经热处理后,树脂分布发生变化,160℃浸渍热处理材附着于细胞壁上的树脂分布较均匀平整,随着热处理温度升高,树脂体积收缩形成规则球状细小颗粒,不再堵塞纹孔;浸渍材的干缩湿胀率均较素材提高,尺寸稳定性降低;浸渍材经热处理后产生了对杨木素材进行热处理的类似改性效果,其吸湿率显著降低,弦向湿胀率、吸水膨胀率和干缩率均降低,表明热处理能进一步改善浸渍材的尺寸稳定性,但160、180和200℃浸渍热处理材的尺寸稳定性差别不大。
关键词:  浸渍改性  热处理  浸渍热处理  微观结构  尺寸稳定性
DOI:10.13610/j.cnki.1672-352x.20201113.021
基金项目:江苏省科技项目(SZ-SQ2019023)和安徽省重点科技攻关项目(1704a070076)共同资助。
Effects of impregnation and heat-treatment on microstructure and dimensional stability of poplar
WU Meihui,ZHAO Chenpeng,CAI Jiabin,JIN Juwan,SUN Zhaobin
(College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037;College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037;College of Forestry, Hebei Agricultural University, Baoding 071001)
Abstract:
In order to expand the application range of fast-growing wood, the poplar wood was impregnated with urea-formaldehyde resin, and the impregnated wood and non-impregnated (untreated) wood were treated with heat treatment. The microstructure, moisture absorption, water absorption and shrinkage performance of untreated, impregnated, impregnated combined heat-treated and heat-treated poplar wood were analyzed. The results showed that the resin filled in the vessels, wood fibers, wood rays, pits and the cell corner, and even inflated the cell wall after impregnation modification. The distribution of resin changed after heat treatment. The resin attached to the cell wall of impregnated combined 160℃ heat-treatment wood was evenly distributed. With the increase of temperature, the volume of resin shrank to form regular spherical fine particles, which no longer blocked the pits. Compared to the untreated wood, the swelling and shrinkage efficiency of the impregnated wood all increased. Similar to the modification effect of the heat treatment on poplar wood, the hygroscopicity of this combined modified wood was significantly reduced than that of the impregnated wood, and the swelling and shrinkage efficiency all decreased, which indicated that heat-treatment can improve the dimensional stability of impregnated wood. Additionally, the effect of the test temperature (160, 180 and 200℃) of the heat-treatment on dimensional stability of this combined modified wood was not obvious.
Key words:  impregnation  heat-treatment  impregnation combined heat-treatment  microstructure  dimensional stability

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