Facile fabrication of transparent cellulose films with high water repellency and gas barrier properties
Facile fabrication of transparent cellulose films with high water repellency and gas barrier properties
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DOI：
10.1007/s10570-012-9790-5
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发表时间：
2012-09
期刊：
影响因子：
5.7
通讯作者：
Quanling Yang;Tsuguyuki Saito;A. Isogai
中科院分区：
文献类型：
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作者：
Quanling Yang;Tsuguyuki Saito;A. Isogai
通过在阳离子烷基烯酮二聚体（AKD）分散液中浸泡、干燥和加热对碱/尿素再生纤维素（AUC）膜进行表面改性，制备了透明且疏水的气体阻隔纤维素膜。AKD处理和加热的AUC膜由于疏水AKD组分覆盖膜表面而获得高度防水性和优异的气体阻隔性。薄膜中AKD的最大含量为0.2%。AKD处理的AUC薄膜在0%相对湿度（RH）下的氧气透过率小于0.0005 mL m− 2 day − 1 kPa −1，这是仪器的最低检测限。AUC膜上的水接触角在AKD处理后从50 °增加到110°，并且水吸收（在水中浸泡6天）从92%降低到20%。此外，当薄膜的AKD含量从0增加到0.2%时，在50和75%RH下，氧气渗透率分别从0.56和5.8降低到0.13和2.1 mL μm m-2day-1 kPa-1。本发明的AKD处理的AUC膜还具有高透光性（在600 nm下为88%）、拉伸强度（168 MPa）、断裂伸长率（29%）和断裂功（37 MJ m-3）。FT-IR分析显示，在23 °C和50%RH下调节膜2个月后，AKD组分仍然作为主要物质存在于AKD处理的膜表面上而没有水解，表明这种AKD分子有助于AKD处理的AUC膜的疏水性质。
Transparent and water repellent gas barrier cellulose films were fabricated by surface modification of alkali/urea regenerated cellulose (AUC) films by soaking in cationic alkylketene dimer (AKD) dispersion, drying, and heating. Highly water repellent and excellent gas barrier properties were obtained for AKD-treated and heated AUC films due to covering of the film surfaces by hydrophobic AKD components. The maximum AKD content of the films was 0.2 %. Oxygen transmission rates for AKD-treated AUC films at 0 % relative humidity (RH) were less than 0.0005 mL m−2day−1kPa−1, the lowest detection limit of the instrument. Water contact angles on the AUC film increased from 50 to 110° after AKD treatment, and water uptake (immersion in water for 6 days) decreased from 92 to 20 %. Moreover, oxygen permeability decreased from 0.56 and 5.8 to 0.13 and 2.1 mL μm m−2day−1kPa−1at 50 and 75 % RH, respectively, when the AKD content of the film was increased from 0 to 0.2 %. The present AKD-treated AUC film also had high light transparency (88 % at 600 nm), tensile strength (168 MPa), elongation at break (29 %), and work of fracture (37 MJ m−3). FT–IR analysis showed that AKD components were still present as major species on the AKD-treated film surfaces without hydrolysis at 2 months after conditioning the films at 23 °C and 50 % RH, indicating that such AKD molecules contributed to the hydrophobic nature of the AKD-treated AUC films.