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Butylamino-functionalized cellulose nanocrystal films: barrier properties and mechanical strength

机译：丁基氨基官能化纤维素纳米晶体薄膜：阻隔性能和机械强度

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摘要

Cellulose nanocrystals (CNCs), which are strong, rod-like constituents of plant cellulose, are promising materials for green packaging applications as the material is capable of forming tortuous network structures with efficient barriers against outside gases. Here, a two-step procedure based on periodate oxidation followed by reductive amination was used as a pretreatment to modify bleached birch chemical wood pulp. Individualized CNCs were obtained from three different butylamino-functionalized pulps by mechanical homogenization. The fabricated CNCs were utilized to form transparent barrier films with a vacuum filtration method. All the butylamino-functionalized CNC films showed capability to resist oxygen permeability even at high relative humidity (RH 80%), and values as low as 5.9 +/- 0.2 cm(3) mm per m(2) per day per kPa were recorded for pure cellulose based film using tert-butylamino-functionalized CNCs. In addition a barriers against water vapor permeation and dynamic vapor sorption were determined up to relative humidities of 80 and 90%, respectively. For surface characterization of the films time-dependent contact angles and surface roughness were measured. The films had good mechanical characteristics with tensile strength of 105.7 +/- 9.7 MPa, strain-to-failure of 6.4 +/- 0.6% and a Young's modulus of 5.8 +/- 0.8 GPa.
机译：纤维素纳米晶体（CNC）是植物纤维素的强力棒状成分，是绿色包装应用中有希望的材料，因为该材料能够形成具有有效阻隔外界气体的曲折网络结构。在这里，基于高碘酸盐氧化然后还原胺化的两步程序被用作预处理漂白桦木化学木浆的方法。通过机械均质化从三种不同的丁基氨基官能化纸浆中获得个性化的CNC。利用真空过滤法将所制造的CNC用于形成透明的阻挡膜。所有丁基氨基官能化的CNC膜即使在较高的相对湿度（RH 80％）下也显示出抗氧气渗透的能力，并且记录的值低至5.9 +/- 0.2 cm（3）mm每m（2）每天每kPa使用叔丁基氨基官能化的CNC用于纯纤维素基薄膜。另外，确定了分别在高达80％和90％的相对湿度下的水蒸气渗透和动态蒸气吸附的屏障。对于膜的表面表征，测量时间相关的接触角和表面粗糙度。该膜具有良好的机械特性，拉伸强度为105.7 +/- 9.7 MPa，断裂应变为6.4 +/- 0.6％，杨氏模量为5.8 +/- 0.8 GPa。

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