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 1300, FI-33101 Tampere, Finland.
Carbohydr Polym. 2017 Aug 15;170:160-165. doi: 10.1016/j.carbpol.2017.04.082. Epub 2017 Apr 26.
The Cellulose nanofibrils (CNF), also referred to as nanocellulose, is one of the most studied bio-based material in recent year, which has good potential in the future for packaging applications due to its excellent mechanical strength and oxygen barrier properties. In the future, CNF films may also find new applications for example in printed electronics, if the surface smoothness of CNF films can be improved. One way to improve surface smoothness is to use thin coating solutions with zero porosity, such as molar mass controlled cellulose ester coatings. In this study, we have coated CNF films using molar mass controlled cellulose esters with different side chain lengths forming 3-layer film (ester-CNF-ester). These coatings improved significantly the smoothness of CNF films. The 3-layer films have also good water vapor barrier and mechanical properties and the films are heat-sealable, which enable various new applications in the future.
纤维素纳米纤维（CNF），也被称为纳米纤维素，是近年来研究最多的生物基材料之一，由于其优异的机械强度和氧气阻隔性能，在未来的包装应用中有很大的潜力。如果能提高 CNF 薄膜的表面平整度，未来 CNF 薄膜也可能在印刷电子等新领域找到应用。提高表面平整度的一种方法是使用零孔隙率的薄膜涂层溶液，如分子量可控的纤维素酯涂层。在本研究中，我们使用具有不同侧链长度的分子量可控纤维素酯对 CNF 薄膜进行了涂层处理，形成了 3 层膜（酯-CNF-酯）。这些涂层显著提高了 CNF 薄膜的平整度。3 层膜还具有良好的水蒸气阻隔性和机械性能，且薄膜具有热封性，这使其在未来能有各种新的应用。
