上海弘升科技發展有限公司

上海弘升科技發展有限公司
上海弘升科技發展有限公司

当前位置:弘升科技 > 公司简介

测量应用案例-2020106

2020-01-17 09:41:27

1129

文献名:One-shot TEMPO-periodate oxidation of native cellulose 

 

上海弘升科技發展有限公司David Joram Mendozaa, Christine Brownea, Vikram Singh Raghuwanshia, George P. Simonb, Gil Garniera

aBioresource Processing Research Institute of Australia (BioPRIA), Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia

bDepartment of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia

 

摘要:TEMPO/NaClO/NaBr and sodium periodate were combined in a one-shot reaction to oxidise cellulose from bleached pulp. Oxidation of cellulose forms two fractions: a highly-carboxylated water-insoluble (up to 1.9 mmol COO−/g, DS = 0.39) and a water-soluble fraction (up to 4 mmol COO−/g, DS = 1.1). Results show that these regioselective oxidants work in synergy to produce fully-oxidised 2,3,6-tricarboxycellulose. Increasing the periodate concentration results in fibrillation and extensive depolymerisation of the pulp cellulose as more residual aldehyde groups participate in the depolymerisation process. X-ray diffraction (XRD) reveals that the addition of periodate increases cellulose crystallinity, retains crystal size but slightly alters the XRD pattern. The degree of substitution (DS), which governs the solubility of carboxylated cellulose, can be controlled by varying the periodate concentration. Combining TEMPO/NaBr/NaClO with sodium periodate simultaneously in a one-shot reaction produces low-cost cellulose with controlled level of carboxylation and unique properties.


分享到微信朋友圈

分享到其他

010-51627740

上海弘升科技發展有限公司 上海弘升科技發展有限公司
上海弘升科技發展有限公司