纳米 SiO2的分散对大豆蛋白／PVA 复合膜性能的影响

摘要

采用超声波对纳米 SiO2进行分散，为探讨纳米 SiO2的分散情况对大豆蛋白／PVA 复合薄膜性能的影响，通过单因素试验和正交试验，对复合薄膜的性能进行了系统研究。试验结果表明：纳米SiO2的超声时间，超声温度和超声功率对复合薄膜的性能均有影响；当超声温度为45℃，超声功率为160W，超声时间为40min 时得到的复合膜性能最佳，其中超声温度对薄膜的性能影响最大，其次是超声功率和超声时间；在最佳条件下，薄膜的抗张强度为9．33MPa，伸长率为76．13％，透光率为21．85％，吸水率为47．77％。%In order to investigate the effect of dispersibility of SiO2 nanoparticle on the properties of SiO2 nanoparticles/soy protein /PVA film,the aqueous suspension of the SiO2 nanoparticles was obtained by the ul-trasonic technique and the filming property of the composite film was studied through single-factor experiments and orthogonal experiment.The results showed that there were significant effects on properties of the composite films under different ultrasonic time,ultrasonic temperature and ultrasonic power.And the optimum film-form-ing condition was ultrasonic treating for 40min at 45℃ and 160W,among which the most important factor was ultrasonic temperature,and sequentially followed by ultrasonic power and ultrasonic time.Then the tensile strength,breaking elongation,transmittance and water absorption were 9.33MPa,76.13%,21.85% and 47.77%,respectively.