| 王永在,孟凡朋,杨赞中.微晶纤维素机械力化学处理结构变化研究[J].材料导报,2016,30(14):76-79, 87 |
| 微晶纤维素机械力化学处理结构变化研究 |
| Structural Changes of Microcrystalline Cellulose During Mechanochemical Treatment |
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| DOI：10.11896/j.issn.1005-023X.2016.14.017 |
| 中文关键词: 微晶纤维素 结晶度 晶粒度 粒度分布 显微形态 |
| 英文关键词: micocrystalline cellulose, crystallinity, crystallite size, particle size distribution, morphology |
| 基金项目:山东省科技发展计划项目(2014GZX201008) |
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| 摘要点击次数: 1990 |
| 全文下载次数: 2586 |
| 中文摘要: |
| 使用行星球磨机处理微晶纤维素,研究了研磨时间对纤维素结构变化的影响。用多晶X射线衍射(XRD)、红外吸收光谱(FTIR)、激光粒度 (LPSA)和偏光显微镜,对机械力处理后纤维素样品的结晶度、晶粒度、粒度分布和形貌进行了表征。研究表明,在180 min的研磨过程中,随研磨时间的延长,样品的结晶度持续降低,颗粒团聚程度增加,而晶粒度在 120 min后即达到极小值((002)方向7.8 nm)。研磨产物的粒度分布均呈二峰特征,且粒度分布范围随处理时间延长而减小。机械力处理破坏了微晶纤维素结构中的氢键网络,增加了结构的松弛性。 |
| 英文摘要: |
| Microcrystalline cellulose (MCC) was subjected to mechanical treatment to evaluate the structural changes upon planetary ball milling. Samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), laser particle size analyzer (LPSA) and polarized optical microscopy. During a 180 min grinding, a continuous reduction of crystallinity together with aggregation of the particles was observed. The crystallite size of the 120 min treated sample approached a saturation value (ca.7.8 nm in the (002) direction). It was found that the treated samples showed a bimodal and a narrower particle size distribution with increasing of milling time. Mechanical treatment produced a gradual destruction of the hydrogen-bonding networks in the MCC samples, which resulted in its structural relaxing. |
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