VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Finland.
VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Finland.
Carbohydr Polym. 2016 Oct 20;151:988-995. doi: 10.1016/j.carbpol.2016.06.048. Epub 2016 Jun 14.
Nowadays one of the growing trends is to replace oil-based products with cellulose-based materials. Currently most cellulose esters require a huge excess of chemicals and have therefore, not been broadly used in the industry. Here, we show that decreasing the molar mass of cellulose by ozone hydrolysis provides cellulose functionalization with less chemical consumption. To reveal the differences in reactivity and chemical consumption, we showed esterification of both native cellulose and ozone treated hydrolyzed cellulose. Based on the results, the molar mass of the starting cellulose has a significant effect on the end product's degree of substitution and properties. Furthermore, molar mass controlled palmitate esters form mechanically strong, flexible and optically transparent films with excellent water barrier properties. We anticipate that molar mass controlled cellulose will provide a starting point for the greater use of cellulose based materials, in various application, such as films and composites.
如今，一个日益增长的趋势是用纤维素基材料替代基于石油的产品。目前，大多数纤维素酯都需要大量的化学物质，因此在工业中没有得到广泛应用。在这里，我们表明通过臭氧水解降低纤维素的摩尔质量可以用更少的化学物质进行纤维素功能化。为了揭示反应性和化学消耗的差异，我们展示了天然纤维素和臭氧处理水解纤维素的酯化反应。基于这些结果，起始纤维素的摩尔质量对最终产物的取代度和性能有显著影响。此外，控制摩尔质量的棕榈酸酯形成具有机械强度高、柔韧性好和光学透明的薄膜，具有优异的防水性能。我们预计，控制摩尔质量的纤维素将为在各种应用中（如薄膜和复合材料）更广泛地使用纤维素基材料提供一个起点。
