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Synthesis and characterization of dicarboxymethyl cellulose
Cellulose ( IF 5.7 ) Pub Date : 2019-12-24 , DOI: 10.1007/s10570-019-02952-6
Ricardo Chagas , Martin Gericke , Ricardo B. Ferreira , Thomas Heinze , Luísa M. Ferreira

Synthesis of dicarboxymethyl cellulose (DCMC) under heterogeneous conditions was examined. Cellulose was etherified using sodium bromomalonate in isopropanol/water in the presence of NaOH. The reaction was performed with five different NaOH concentrations (5–30 w/v %) and the products were characterized by anion-exchange high-performance liquid chromatography (AE-HPLC), inductively coupled plasma atomic emission- (ICP-AES), Fourier transform infrared- (FTIR), and nuclear magnetic resonance (1D-/2D-NMR) spectroscopy. Adjusting the amount of NaOH resulted in increasing functionalization of the cellulose achieving an average degree of substitution (DS) between 0.05 and 0.51. Both ICP-AES and AE-HPLC gave comparable DS values. NMR spectroscopic analysis showed that etherification occurred preferably at O-6 and, to a certain extent, at the secondary positions depending on the reaction conditions.

中文翻译:

二羧甲基纤维素的合成与表征

检查了在非均相条件下二羧甲基纤维素(DCMC)的合成。在异丙醇/水中,在NaOH的存在下,使用溴化马来酸钠使纤维素醚化。反应用五种不同的NaOH浓度(5-30 w / v%)进行,产物用阴离子交换高效液相色谱(AE-HPLC),电感耦合等离子体原子发射-(ICP-AES)表征,傅立叶变换红外(FTIR)和核磁共振(1D- / 2D-NMR)光谱。调节NaOH的量导致纤维素的官能化增加,从而实现0.05至0.51之间的平均取代度(DS)。ICP-AES和AE-HPLC均具有可比的DS值。表明,在醚化优选发生NMR光谱分析ö-6,在一定程度上取决于反应条件。
更新日期:2019-12-25
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