Tang Zuwu, Li Wenyan, Lin Xinxing, Xiao He, Miao Qingxian, Huang Liulian, Chen Lihui, Wu Hui
College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Polymers (Basel). 2017 Sep 6;9(9):421. doi: 10.3390/polym9090421.
In this paper, water-soluble 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose with a high degree of oxidation was prepared by a two-step process using bamboo dissolving pulp. The first step was to destroy the cellulose crystal I by NaOH/urea solution to obtain cellulose powder with decreased crystallinity. The second step was to oxidize the cellulose powder by TEMPO oxidation. The TEMPO-oxidized cellulose was analyzed by Fourier transform infrared spectroscopy (FTIR), conductimetry, X-ray diffraction (XRD), fiber analyzer, and transmission electron microscopy (TEM). FTIR showed that the hydroxymethyl groups in cellulose chains were converted into carboxyl groups. The degree of oxidation measured by conductimetry titration was as high as 91.0%. The TEMPO-oxidized cellulose was soluble in water for valuable polyelectrolytes and intermediates.
本文采用两步法，以竹溶解浆为原料制备了高氧化度的水溶性2,2,6,6-四甲基哌啶-1-氧基（TEMPO）氧化纤维素。第一步是用NaOH/尿素溶液破坏纤维素I晶型，得到结晶度降低的纤维素粉末。第二步是通过TEMPO氧化纤维素粉末。通过傅里叶变换红外光谱（FTIR）、电导滴定法、X射线衍射（XRD）、纤维分析仪和透射电子显微镜（TEM）对TEMPO氧化纤维素进行了分析。FTIR表明纤维素链中的羟甲基被转化为羧基。通过电导滴定法测得的氧化度高达91.0%。TEMPO氧化纤维素可溶于水，可作为有价值的聚电解质和中间体。
