The preparation and study of cellulose carbamates and their regenerated membranes.
Using wood pulps with the average degree of polymerization 300-350 and urea as raw materials, cellulose carbamates were successfully synthesized by esterification reaction in N, N-dimethylacetamide(DMAc), an inexpensive, high boiling aprotic and polar solvent, for the purpose of improving the solubility of cellulose, reducing costs and environmental pollution. The products were dissolved in 9% sodium hydroxide solution at a low temperature after washing and drying and the cellulose carbamates solutions were obtained. The solutions were uniformly casted on a glass support after degassing. The regenerated cellulose membranes (CMs) were prepared by immersing the support in coagulation bath for some minutes. The structures of cellulose carbamates were characterized by Fourier transform infrared spectroscopy (FT-IR),13C solid state nuclear magnetic resonance spectrometry (13C NMR), Thermal gravimetric analysis(TG), Scanning electron microscopy (SEM) and X-ray diffractometry(XRD). The filtration performances of CMs were tested. The results reveal that part groups of cellulose were substituted by amino in the medium, the cellulose carbamates were prepared with the reducing crystallinity and thermal decomposition temperature. The CMs have good separation performance for methylene blue.
Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage, School of Material Science and Engineering, TianJin Polytechnic University, TianJin 300387, China.
Guomin
G
Yu
Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage, School of Material Science and Engineering, TianJin Polytechnic University, TianJin 300387, China.
Yun
Y
Teng
Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage, School of Material Science and Engineering, TianJin Polytechnic University, TianJin 300387, China.
Weidong
W
Lai
Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage, School of Material Science and Engineering, TianJin Polytechnic University, TianJin 300387, China. Electronic address: yincuiyu@tjpu.edu.cn.
Cuiyu
C
Yin
D002219:Carbamates / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D008567:Membranes, Artificial; D012972:Sodium Hydroxide / Q000737:chemistry; D013696:Temperature; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification
D002219:Carbamates; D002482:Cellulose; D008567:Membranes, Artificial; D012972:Sodium Hydroxide; D062065:Wastewater
Cellulose carbamates; Membrane; N,N-dimethylacetamide