TEMPO-mediated oxidation of bacterial cellulose in a bromide-free system

被引：43

作者：

Lai, Chen ^{[1
,2
]}

Zhang, Shujiang ^{[3
]}

Sheng, Liyuan ^{[1
]}

Liao, Shibo ^{[1
]}

Xi, Tingfei ^{[1
]}

Zhang, Zhixiong ^{[1
]}

机构：

[1] Peking Univ, Shenzhen Inst, Shenzhen Key Lab Human Tissue Regenerat & Repair, Shenzhen 518057, Peoples R China

[2] Sichun Univ, Natl Engn Res Ctr Biomat, Chengdu 610064, Peoples R China

[3] Guangzhou Med Univ, Affiliated Hosp 1, Guangzhou 510120, Guangdong, Peoples R China

来源：

COLLOID AND POLYMER SCIENCE | 2013年 / 291卷 / 12期

关键词：

Bacterial cellulose; Oxidation; Bromide free; CARBOXYLATION; SUSPENSIONS; COMPOSITES; CATALYST;

D O I：

10.1007/s00396-013-3033-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A partially C6-carboxylated bacterial cellulose (BC) with a high carboxylate content was prepared in a bromide-free system by using 2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) as a catalyst. ART-FTIR, X-ray diffraction, solid C-13-NMR, TEM analysis, and reaction kinetics measurements were performed to investigate the oxidation reaction of BC. Results show that C6 carboxylate was formed selectively on the microfiber surface without disrupting its highly ordered nanocrystalline structure. Given the extremely low accessibility of hydroxyl groups in D-anhydroglucopyranose units, the reaction can be described by second-order kinetics with very low reaction rate constants. pH exhibited a significant influence on the oxidation of BC and a higher activity at C6 was observed in a neutral medium.

引用

页码：2985 / 2992

页数：8

共 38 条

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