大豆蛋白纳米二氧化钛复合膜的制备及性能研究

Preparation of composite film of soy protein and titania nanoparticles and its properties

以十二烷基磺酸钠为分散剂,采用超声波分散技术将不同掺杂比的纳米二氧化钛引入大豆蛋白成膜液中,用流延法制得分散均匀的纳米复合膜。随着纳米二氧化钛用量的增加,复合膜的抗拉强度和断裂伸长率先增大后减小,透湿性和透氧性则按先减小后增大的趋势变化。当纳米二氧化钛质量为大豆蛋白1/200时,复合膜的抗拉强度和断裂伸长率都达到最大值,分别比大豆蛋白膜提高了106%和112%;而复合膜的透氧系数则最低,比大豆蛋白膜低了近7.5倍。

Titania nanoparticles treated with sodium dodecyl sulfate are dispersed into the soy protein solution in different mass ratios by the ultrasonic technology to get nano-composite films through casting technique. The tensile strength and breaking extension rate increase first and then decrease, the water vapor and oxygen permeability dechne first and rise later, with the increasing of titania dosage. With a mass ratio of titania and soy protein of 1 ： 200, the tensile strength and breaking extension rate can reach the maximum, increase by 106% and 112%, respectively, compared with soy protein film, whereas the oxygen permeability is the minimum, which decreases by 7.5 times.