Influence of coagulation temperature on pore size and properties of cellulose membranes prepared from NaOH-urea aqueous solution

被引:70
作者
Cai, Jie [1 ]
Wang, Linxiang [1 ]
Zhang, Lina [1 ]
机构
[1] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China
基金
国家高技术研究发展计划(863计划); 中国国家自然科学基金;
关键词
NaOH-urea aqueous solution; cellulose membranes; coagulation temperature; SEM; water permeability;
D O I
10.1007/s10570-007-9106-3
中图分类号
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号
0805 ; 080502 ; 0822 ;
摘要
The morphology and structure of the regenerated cellulose membranes prepared from its NaOH-urea aqueous solution by coagulating with 5 wt% H2SO4-10 wt% Na2SO4 aqueous solution with different temperatures and times were investigated. The pore size, water permeability and physical properties of the membranes were measured with scanning electron micrograph (SEM), wide X-ray diffraction (WXRD), Fourier transfer infrared spectroscopy (FTIR), flow rate method, and tensile testing. The SEM observation revealed that the structure and pore size of the membranes changed drastically as a function of the coagulation temperature. The membranes coagulated at lower temperatures tended to form the relatively small pore size than those at higher temperatures. On the contrary, the membranes coagulated at different times exhibited similar pore size. Interestingly, the mean pore size and water permeability of the membranes increased from 110 nm with standard deviation (SD) of 25 nm and 12 ml h(-1) m(-2) mmHg(-1) respectively to 1,230 nm with SD of 180 nm and 43 ml h(-1) m(-2) mmHg(-1) with an increase in coagulation temperature from 10 to 60 degrees C. However, the membranes regenerated below 20 degrees C exhibited the dense structure as well as good tensile strength and elongation at break. The result from FTIR and ultraviolet-visible (UV-vis) spectroscopy indicated that the relatively strong intermolecular hydrogen bonds exist in the cellulose membranes prepared at lower coagulation temperatures. This work provided a promising way to prepare cellulose materials with different pore sizes and physical properties by controlling the coagulation temperature.
引用
收藏
页码:205 / 215
页数:11
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