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首页> 外文期刊>Journal of Applied Polymer Science >HYDROGELS FROM POLYSACCHARIDES .1. CELLULOSE BEADS FOR CHROMATOGRAPHIC SUPPORT
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HYDROGELS FROM POLYSACCHARIDES .1. CELLULOSE BEADS FOR CHROMATOGRAPHIC SUPPORT

机译：多糖中的水合物1。色谱支持的纤维素珠

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摘要

Cellulosic hydrogels in bead form were prepared by dropwise addition of cellulose solutions in N,N-dimethylacetamide (DMAc) and lithium chloride (LiCl) to azeotropic methanol or isopropanol as nonsolvent. Bead properties were examined in relation to cellulose solution concentration, viscosity, and molecular weight. Bead properties were defined in terms of solids content, flow characteristics, mechanical strength, bead size, and pore dimensions. Results suggest that (a) beads can be prepared with solids content ranging from 2 to 12 wt %, depending on solution concentration; (b) uniform spherical shapes require a viscosity range between 100 and 300 cS; (c) beads can be produced in different sizes, within the diameter range of 100 to 1,500 mu m; (d) linear flow velocities of packed bead columns are in the range of 70 to 350 cm/min; and (e) pore sizes of beads vary between 8 to 200 Angstrom. Beads with low cellulose concentration show a wide fractionation range of up to 200,000 g/mol for polyethylene oxide. (C) 1996 John Wiley & Sons, Inc. [References: 19]
机译：通过将N，N-二甲基乙酰胺（DMAc）和氯化锂（LiCl）中的纤维素溶液滴加到共沸甲醇或异丙醇中作为非溶剂，可制备成珠状的纤维素水凝胶。检查了与纤维素溶液浓度，粘度和分子量有关的珠子性质。珠粒的特性根据固含量，流动特性，机械强度，珠粒尺寸和孔尺寸定义。结果表明：（a）可以制备固含量为2至12 wt％（取决于溶液浓度）的珠粒; （b）均匀的球形要求粘度在100至300 cS之间; （c）可以在100至1,500微米的直径范围内生产不同尺寸的珠子; （d）填充珠柱的线性流速在70至350 cm / min的范围内; （e）珠的孔径在8至200埃之间。对于聚环氧乙烷，具有低纤维素浓度的珠子显示高达200,000 g / mol的较宽的分馏范围。 （C）1996 John Wiley＆Sons，Inc. [参考：19]

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