Transparent cellulose films with high gas barrier properties fabricated from aqueous alkali/urea solutions.
Transparent cellulose films with high gas barrier properties fabricated from aqueous alkali/urea solutions.
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DOI：
10.1021/bm200766v
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发表时间：
2011-06
影响因子：
6.2
通讯作者：
Quanling Yang;Hayaka Fukuzumi;Tsuguyuki Saito;A. Isogai;Lina Zhang
中科院分区：
文献类型：
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作者：
Quanling Yang;Hayaka Fukuzumi;Tsuguyuki Saito;A. Isogai;Lina Zhang
由碱（NaOH或LiOH）/尿素（Au）水溶液制备的透明且可弯曲的再生纤维素膜表现出高氧气阻隔性，其上级于常规玻璃纸、聚（偏二氯乙烯）和聚（乙烯醇）的那些。针对不同的溶解和再生条件，从不同的纤维素源（棉短绒、微晶纤维素粉末和软木漂白硫酸盐浆）制备系列Au纤维素膜。这些Au纤维素膜的氧渗透性在0%相对湿度下从0.003到0.03 mL μm m（-2）day（-1）kPa（-1）变化很大，这取决于用于制备膜的条件。在0 °C下用丙酮再生由6wt%纤维素溶液制备的Au膜获得最低的氧渗透率。Au纤维素膜的氧渗透性与它们的密度负相关，并且通过在低温下在溶剂中再生由具有高纤维素浓度的溶液制备的Au膜通常具有低的氧渗透性。因此，Au纤维素膜是具有高氧气阻隔性能的有前途的生物基包装材料。
Transparent and bendable regenerated cellulose films prepared from aqueous alkali (NaOH or LiOH)/urea (AU) solutions exhibit high oxygen barrier properties, which are superior to those of conventional cellophane, poly(vinylidene chloride), and poly(vinyl alcohol). Series of AU cellulose films are prepared from different cellulose sources (cotton linters, microcrystalline cellulose powder, and softwood bleached kraft pulp) for different dissolution and regeneration conditions. The oxygen permeabilities of these AU cellulose films vary widely from 0.003 to 0.03 mL μm m(-2) day(-1) kPa(-1) at 0% relative humidity depending on the conditions used to prepare the films. The lowest oxygen permeability is achieved for the AU film prepared from 6 wt % cellulose solution by regeneration with acetone at 0 °C. The oxygen permeabilities of the AU cellulose films are negatively correlated with their densities, and AU films prepared from solutions with high cellulose concentrations by regeneration in a solvent at low temperatures generally have low oxygen permeabilities. The AU cellulose films are, therefore, promising biobased packaging materials with high-oxygen barrier properties.