文章摘要
纤维素氨基甲酸酯的制备及再生膜的应用
Preparation of Cellulose Carbamates and Applications of Their Regenerated Membranes
  
DOI:10.16865/j.cnki.1000-7555.2017.09.026
中文关键词: N,N-二甲基乙酰胺  纤维素氨基甲酸酯  再生膜
英文关键词: N,N- dimethylacetamide  cellulose carbamates  regenerated membranes
基金项目:
作者单位
余国民,滕云,傅轶凡,尹翠玉 天津工业大学材料科学与工程学院,天津 300387 
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中文摘要:
      以常用廉价溶剂N,N-二甲基乙酰胺(DMAc)为介质,以纤维素和尿素为原料,制备了纤维素氨基甲酸酯(CC),采用红外光谱、X射线衍射、扫描电镜等对产物的结构进行了表征,并对纤维素再生膜的截留性能进行了研究。结果表明,制备纤维素氨基甲酸酯的最佳反应条件为160℃,8h;酯化前后,纤维素晶型没有发生明显的变化;制备的纤维素再生膜具有孔径很小的微孔,这些微孔能够使H2O 和Na2SO4 在压力的作用下顺利通过,而对亚甲基蓝有良好的截留效果;因此,纤维素再生膜对含亚甲基蓝的废水具有良好的分离效果。
英文摘要:
      N, N-dimethylacetamide(DMAc), a common and inexpensive solvent, was chosen as medium, cellulose carbamates(CC) were successfully prepared by the reaction of cotton pulps and urea. The structures of samples were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy(SEM) and X-ray diffractometry(XRD). The filtration performance of the regenerated membranes was also studied. The results show that the optimum reaction condition for preparing CC in DMAc is 160 ℃ for 8 h. It is found that the crystal forms of cellulose are not changed after esterification. It is also shown that there are a large number of tiny holes on the membranes that allowing small molecules, such as H2O and H2SO4, to pass through, methylene blue with a larger size than water molecules, however, is rejected. Undoubtedly, the regenerated membranes have good separation performance for wastewater containing methylene blue.
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