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Micron-sized cellulose microspheres were prepared through sol-gel method using NaOH/urea solution to dissolve cellulose,then cross-linked by 1,6-hexanylene diisocyanate(HDI),toluene 2,4-diisocyanate(TDI)and 1,4-phenylene diisocyanate(PDI),respectively.The reaction conditions for partial modification of the microspheres were studied.The degree of substitution(DS)in cellulose was controlled by adjusting the reaction conditions.HDI-crosslinked microspheres were partially modified with phenyl isocyanate to obtain chiral stationary phases(CSPs).The CSPs of a lower degree of crosslinking(DC)showed better chiral recognition ability than those of a higher DC.Meanwhile the CSPs prepared by premodification exhibited better chiral recognition ability than those prepared by pre-crosslinking.
Micron-sized cellulose microspheres were prepared by sol-gel method using NaOH / urea solution to dissolve cellulose, then cross-linked by 1,6-hexanylene diisocyanate (HDI), toluene 2,4-diisocyanate phenylene diisocyanate (PDI), respectively. The reaction conditions for partial modification of the microspheres were studied. degree of substitution (DS) in cellulose was controlled by adjusting the reaction conditions. HDI-crosslinked microspheres were partially modified with phenyl isocyanate to obtain chiral stationary phases (CSPs). The CSPs of a lower degree of crosslinking (DC) showed better chiral recognition ability than those of a higher DC.Meanwhile the CSPs prepared by premodification phenols better chiral recognition ability than those prepared by pre-crosslinking.