One-sided Surface modification of bacterial cellulose sheet as 2,3-dialdehyde
One-sided Surface modification of bacterial cellulose sheet as 2,3-dialdehyde
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细菌纤维素片的单面表面改性为2,3-二醛
DOI：
10.1080/03602559.2014.977428
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发表时间：
2015
影响因子：
--
通讯作者：
H. Uyama
中科院分区：
文献类型：
--
作者：
H. Shim;M. Karina;R. Yudianti;L. Indrarti;J. Azuma;H. Uyama
木葡糖酸醋杆菌（Gluconacetobacter xylinus）产生的细菌纤维素（BC）的一个独特性质是其高度溶胀的凝胶片状形式。这一特性促使我们对其表面进行改性，以制造功能性纤维素片材。在这项研究中，我们试图通过引入反应性2，3-二醛衍生物（DABC）优先与有限的高碘酸盐氧化的BC的单侧表面改性。结果表明，单侧改性的最佳反应条件是在50°C下在黑暗中用高碘酸盐溶液（纤维素/高碘酸钠接近1.21，w/w）反应3 h。半干燥BC片材（厚度20 µm，水分含量96.7%）对于改性具有高反应性。通过衰减全反射-傅里叶变换红外（ATR-FTIR）光谱测定反应的选择性。通过扫描电镜（SEM）、广角X射线衍射（WAXD）、热重分析（TGA）和拉伸试验（TT）对产物进行了表征。扫描电镜（SEM）结果表明，纤维素微纤保持了原纤直径，广角X射线衍射（WAXD）结果表明，反应后纤维素微纤保持了晶型Iα。通过TGA和TT分析监测反应的进展。
A unique property of bacterial cellulose (BC) produced byGluconacetobacter xylinusis its highly swollen gel sheet-shaped form. This property prompted us to modify its surface to make a functional cellulose sheet. In this study, we attempted one-sided surface modification of BC by the introduction of reactive 2,3-dialdehyde derivatives (DABC) preferentially with limited periodate oxidation. The results indicate that the best reaction condition for one-sided modification was 3 h at 50°C with a periodate solution (cellulose/sodium periodate near 1.21, w/w) in the dark. Semi-dried BC sheets (thickness 20 µm, moisture content 96.7%) have high reactivity for the modification. Selectivity of the reaction was determined by attenuated total reflectance–Fourier transform infrared (ATR–FTIR) spectroscopy. The products were further characterized by scanning electron microscopy (SEM), wide-angle X-ray diffractometry (WAXD), thermogravimetric analysis (TGA) and tensile testing (TT). The results from SEM indicate that the cellulose microfibrils maintained their original diameter, and those from WAXD show that the crystalline allomorph Iα is retained after the reaction. Progression of the reaction was monitored by TGA and TT analyses.