CSIRO Materials Science & Engineering, Gate 5 Normanby Road, Clayton 3168, Australia.
Carbohydr Polym. 2013 Feb 15;92(2):1717-23. doi: 10.1016/j.carbpol.2012.11.007. Epub 2012 Nov 9.
Bacterial cellulose is a pure, highly crystalline form of cellulose produced from the bacteria Gluconacetobacter xylinus that has become of increasing interest in materials science due to its nanofibrillar structure, ideal for incorporation into other materials as a reinforcing material. The morphology and properties of bacterial cellulose can be altered by including additives not specifically required for growth of the bacteria in liquid media. The bioplastic poly-3-hydroxybutyrate (PHB), along with hydroxypropylmethyl cellulose (HPMC) and Tween 80 were selected and added to the growth media at different concentrations to examine their impact on the resulting cellulose, leading to changes in yield, crystallinity and morphology. The crystallinity index of the nanofibrils was found to vary greatly when using these different methods to calculate it from XRD data, indicating that particular care must be taken when comparing crystallinity results reported in the literature. PHB was able to be incorporated into the bacterial cellulose fibrils during production, increasing the potential for favourable interactions of the bacterial cellulose microfibrils with a neat PHB matrix with the aim of making a fully degradable nanocomposite system.
细菌纤维素是一种由木醋杆菌产生的纯的、高度结晶的纤维素形式，由于其纳米纤维结构，在材料科学中越来越受到关注，非常适合作为增强材料掺入其他材料中。通过在液体培养基中加入不是细菌生长所必需的添加剂，可以改变细菌纤维素的形态和性质。选择了生物塑料聚-3-羟基丁酸酯 (PHB)、羟丙基甲基纤维素 (HPMC) 和吐温 80，并以不同浓度添加到生长培养基中，以研究它们对所得纤维素的影响，从而导致产率、结晶度和形态的变化。发现使用这些不同的方法从 XRD 数据计算结晶度指数时，纳米纤维的结晶度指数变化很大，这表明在比较文献中报告的结晶度结果时必须特别小心。在生产过程中，PHB 能够掺入细菌纤维素原纤维中，增加了细菌纤维素微纤维与纯 PHB 基质之间有利相互作用的可能性，目的是制造完全可降解的纳米复合材料系统。
