Morphological and structural development of hardwood cellulose during mechanochemical pretreatment in solid state through pan-milling
Morphological and structural development of hardwood cellulose during mechanochemical pretreatment in solid state through pan-milling
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DOI：
10.1007/s10570-007-9135-y
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发表时间：
2007-06
期刊：
影响因子：
5.7
通讯作者：
Wei Zhang;Mei Liang;Canhui Lu
中科院分区：
文献类型：
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作者：
Wei Zhang;Mei Liang;Canhui Lu
采用自行设计的磨盘式粉碎设备对阔叶木纤维素进行机械力化学预处理，该设备具有独特的智能结构，可对物料之间施加强大的剪切力和压力，并将其破碎。采用激光粒度分析仪、扫描电镜、红外光谱、广角X射线衍射等手段研究了球磨过程中粉体的粒度、形貌、分子结构和晶体结构的变化。与标准球磨法相比，盘磨法在阔叶木纤维素的机械力化学预处理中表现出更高的效率。经过40次球磨循环后，平均粒径减小到21 μm，比表面积增加到0.8m2/g。机械研磨也导致氢键的崩溃和结晶度的降低。纤维素粉末的结晶度指数从初始的65下降到22，经过40个循环的研磨。热分析和溶解性测试表明，球磨纤维素具有较低的热稳定性和较高的碱溶解性。
Mechanochemical pretreatment of hardwood cellulose was conducted by our self-designed pan-mill equipment which has an unique and smart structure and can exert strong shear forces and pressure on materials in between and break them down. The structure transformations, including particle size, powder morphology, molecular structure, crystalline structure during milling were investigated by Laser Diffraction Particle Size Analyzer, SEM, FT-IR and WAXD, respectively. Compared with standard method of ball-milling, the pan-mill shows a much higher efficiency in mechanochemical pretreatment of hardwood cellulose. The average particle size reduced to 21 μm and the specific surface area increased to 0.8 m2/g after 40 milling cycles. Mechanical milling also led to collapse of hydrogen bonds and reduction of crystallinity. The crystallinity index of cellulose powder decreased from its original 65 to 22, after milling for 40 cycles. Thermal analysis and solubility testing illustrated that pan-milled cellulose has lower thermal stability and higher solubility in aqueous alkali.