酸、碱硅溶胶改性木材的制备与性能研究
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摘要
采用酸、碱性硅溶胶分别浸渍处理杨木,并测试未改性和改性材的微观结构、弯曲性能以及热降解性能。结果显示:硅溶胶可有效渗入并填充在改性木材的孔隙结构中;酸性硅溶胶改性材的抗弯性能增加,碱性硅溶胶改性材仅MOR增加,MOE则基本不变;改性材热降解残重增加,炭化温度降低,表观活化能提高,起到了阻燃效果。
Acidic and alkaline silica sols were used to impregnate wood samples. Then the wood sample's microstructure was observed using an SEM. Bending properties and thermal degradation properties of the wood samples were also tested. The results showed that silica sols could effectively permeate and fill into the sample's pore structure. Bending properties of the samples modified with acidic silica sols, increased more than those modified with alkaline silica sols. Thermal degradation residual weights increased with decreased carbonization temperature and increased apparent activation energy, which exhibited improved flame retardance.
Acidic and alkaline silica sols were used to impregnate wood samples. Then the wood sample's microstructure was observed using an SEM. Bending properties and thermal degradation properties of the wood samples were also tested. The results showed that silica sols could effectively permeate and fill into the sample's pore structure. Bending properties of the samples modified with acidic silica sols, increased more than those modified with alkaline silica sols. Thermal degradation residual weights increased with decreased carbonization temperature and increased apparent activation energy, which exhibited improved flame retardance.
引文
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[5]孙敏洋,曹金珍.SiO2溶胶在欧洲赤松和火炬松边材中的渗透性[J].北京林业大学学报,2015,39(9):85-90.
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[7]Lu Y L,Feng M,Zhan H.Preparation of SiO2-wood composites by an ultrasonic-assisted sol-gel technique[J].Cellulose,2014,21(6):4393-4403.
[8]张维.掺磷硅溶胶的制备及其对真丝和羊毛织物的阻燃整理[D].苏州:苏州大学,2015.
[9]卿彦,吴义强,秦志永,等.Si O2/杨木复合材料制备与性能评价[J].复合材料学报,2011,28(6):125-131.
[10]陈志林,傅峰,叶克林,等.SiO2凝胶/木材复合材料制备[J].北京工业大学学报,2010,36(2):250-254.
[11]宋成芳.生物质催化热解炭化的试验研究与机理分析[D].杭州:浙江工业大学,2013.
[12]Ozawa T.A New Method of Analyzing Thermogravimetric Data[J].Bull Chem Soc Jpn,1965,38(11):1881-1886.
[13]郭银清,廖益强.毛竹热解特性及其动力学分析[J].福建农林大学学报(自然科学版),2015,44(3):270-275.