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中文摘要：
以溶解级木浆作为原料，通过TEMPO（2，2，6，6-四甲基哌啶-1-氧化物自由基）／NaCl0／NaCl02氧化体系对纤维素C-6羟基进行氧化，经过乙酰化处理后制备出C-6位含羧基的氧化纤维素醋酸酯。用红外光谱（IR）、X-射线衍射（xRD）和核磁共振（NMR）等手段表征了产物的结构，用热重分析（TGA）和差示扫描量热法（DsC）测试了产物的热性能。结果表明：所合成氧化纤维素醋酸酯的C-6位羧基取代度为0．15，乙酰基取代度为2．72（其中C-2为0．93、C-3为0．98、C-6为0．81）且取代均匀性较好；用C-6羟基的选择性氧化预处理可实现纤维素的可控酯化；产物能溶于DMSO（二甲基亚砜）；产物的晶型由纤维素Ⅰ型转变成纤维素Ⅱ型。氧化纤维素醋酸酯在185℃发生玻璃化转变，在257℃熔融。乙酰基的接入，使产物的热塑性提高。
英文摘要：
Oxidized cellulose acetate with a free carboxylic acid group content of 0.g3mmol/g on C-6 position of the glucose and a total degree of substitution （DS） 2.72, was prepared by oxidizing the dissolving wood pulp with TEMPO/NaCIO/NaCIO2 and then reacted with a mixture of acetic acid and acetic anhydride with sulfuric acid as catalyst. The structure of the product was characterized with Fourier transfer infrared spectroscopy, X-ray diffraction analysis, proton and carbon-13 nuclear magnetic resonance. The thermal properties were tested by thermo-gravimetry analysis and differential scanning calorimetry. The results show the product has a good substitution uniformity with C-2, C-3 and C-6 position＇s acetyl DS of 0.93, 0.98 and 0.81 respectively. The product can dissolve in dimethylsulfoxide, and has good thermoplastic with a melting point of 257 degree celsius. The acetyl access improves thermoplastic of the product.
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