水热或碱预处理协同无机硅矿化竹材性能  

Performance of Inorganic Silica Mineralized Bamboo with Hydrothermal or Alkaline Pretreatment

作　　者：杜静静 蒋军[1,4] 黄浩文 王佳敏 梅长彤 DU Jing-jing;JIANG Jun;HUANG Hao-wen;WANG Jia-min;MEI Chang-tong(Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University,Nanjing 210037,Jiangsu,P.R.China;Institute of Functional Nano and Soft Materials,Soochow University,Suzhou 215127,Jiangsu,P.R.China;Beijing Center for Physical and Chemical Analysis,Beijing Academy of Science and Technology,Beijing 100089,P.R.China;Institute of Green Household Furniture Industry,Huzhou 313009,Zhejiang,P.R.China)

机构地区：[1]南京林业大学林业资源高效加工利用协同创新中心,江苏南京210037 [2]苏州大学功能纳米与软物质研究院,江苏苏州215127 [3]北京市科学技术研究院,北京市理化分析测试中心,北京100089 [4]南浔区绿色家居产业研究院,浙江湖州313009

出　　处：《林产工业》2023年第5期7-14,20,共9页China Forest Products Industry

基　　金：国家自然科学基金(31901248);浙江省绿色家居产业创新关键技术攻关项目。

摘　　要：水热处理和碱处理诱导竹材细胞壁组分降解和小分子物质的溶解,可缩短无机硅在竹材内的有效渗透路径,提供额外的微/纳米通道和沉积空间。以四年生毛竹为研究对象,采用显微观察技术、傅里叶变换红外光谱技术和X射线衍射技术等,探究水热处理和碱处理对竹材微观结构、液体渗透性和化学组成的影响,揭示预处理方式对无机硅矿化竹材疏水性、力学性能和热稳定性等性能的作用机制。结果表明:相比于水热处理,碱处理对细胞壁中半纤维素和木质素的降解效果更为显著,构筑了疏松的细胞壁结构状态。但碱处理过程中的降解作用,在一定程度上给竹材的吸水性、吸湿性、表面硬度和力学性能等带来负面影响。无机硅矿化作用可以弥补上述负面作用,以改善竹材的疏水性、阻湿性和力学性能等。同时,无机硅矿化与碱处理可协同提高竹材的热稳定性。Hydrothermal and alkaline treatment could induce the degradation of cell wall polymers and dissolution of substances with low molecular-weight,which could shorten the penetration path for inorganic silica in bamboo,and provide extra micro-/nano-channels and spaces for silica transportation and deposition.Four-year-old moso bamboo was investigated to reveal the mechanism of improvement on hydrophobicity,mechanical properties and thermal stability of inorganic silica mineralized bamboo with different pretreatments via SEM-EDX,FTIR and XRD technologies.The results showed that:compared to hydrothermal treatment,the degradation of hemicellulose and lignin caused by alkaline treatment was obvious.It could develop the porous cell wall structure.However,the degradation of cell wall polymers caused by alkaline treatment brought some negative effects on water absorption,moisture adsorption,surface hardness and mechanical properties of bamboo.Inorganic silica mineralization could compensate the above negative effects,to improve the hydrophobicity,moisture resistance and mechanical properties.Also,silica mineralization and alkaline treatment could provide a synergistic effect on improving thermal stability of bamboo.

关 键 词：水热处理 碱处理 矿化竹材 渗透性 力学性能 热稳定性 

分 类 号：TS6[轻工技术与工程]