کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9749327 | 1493807 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polymer fractionation using chromatographic column packed with novel regenerated cellulose beads modified with silane
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Novel microporous beads with the particle size of about 90 μm were prepared, for the first time, from cellulose and konjac glucomannan (RC/KGM3) in 1.5 M NaOH/0.65 M thiourea aqueous solution by emulsification method. The microporous beads were then modified with silane to avoid the adsorption of polymers containing hydroxyl groups, coded as RC/KGM3-Si. A preparative size-exclusion chromatographic (SEC) column (500 mm Ã 20 mm) was packed with RC/KGM3-Si, and its exclusion limit and fractionation range of the stationary phase were, respectively, weight-average molecular masses (Mw) of 4.8 Ã l05 g/mol and 5.3 Ã l03-4.8 Ã l05 g/mol for polystyrene in tetrahydrofuran. The preparative SEC column was used to fractionate poly(É-caprolactone) (PCL, Mw = 8.31 Ã l04 g/mol polydispersity index d = 1.55) in tetrahydrofuran and a polysaccharide PC3-2 (Mw = 1.21 Ã l05 g/mol, d = 1.70) in 0.05 M NaOH aqueous solution, respectively. The Mw values of the fractions determined by analytical SEC combined with laser light scattering were from 1.2 Ã l04 to 1.84 Ã l05 for PCL and from 8.5 Ã l04 to 2.13 Ã l05 for PC3-2, as well as d from 1.2 to 1.5. The results indicated that the preparative SEC has good fractionation efficiency in both organic solvent and alkaline aqueous solution for the various polymers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1063, Issues 1â2, 21 January 2005, Pages 71-77
Journal: Journal of Chromatography A - Volume 1063, Issues 1â2, 21 January 2005, Pages 71-77
نویسندگان
Xiaopeng Xiong, Lina Zhang, Yifeng Wang,