乙醇体系中聚合TiO2溶胶的凝胶时间研究

为了研究乙醇、水和盐酸3种试剂的添加量与聚合TiO2溶胶凝胶时间之间的关系,利用单因素试验对3种试剂的适宜添加量进行了初步研究,并进一步利用正交试验探讨了添加量对凝胶时间的影响规律。结果表明,凝胶时间随盐酸添加量的增加依次增大,当盐酸的添加量为0.4 mol/mol时膜层出现气泡状点状物,因此盐酸的最大添加量为0.4 mol/mol;凝胶时间随乙醇添加量的减少依次缩短,当其添加量减少到9 mol/mol时无法得到溶胶,因此乙醇的最小添加量为9 mol/mol;凝胶时间随水添加量的增大而减少,当水的添加量增大到4 mol/mol时无法得到溶胶,因此水的最大添加量为4 mol/mol。正交试验结果表明,乙醇、水和盐酸3种试剂的添加量对凝胶时间有极显著的影响,进一步利用统计分析软件SAS(Statistical analysis system)对正交试验结果进行回归分析,得到了可以描述二者关系的线性回归方程。预测试验结果表明,该线性回归方程可以准确地预测凝胶时间,从而为掌握合适的涂膜时机提供了参考。

Gelation time of ethanol based on polymeric titania sol

In order to explore the gelation time of ethanol based on polymeric titania sol at different amount of ethanol,water and hydrochloric acid,the trial based on single factor test was used to determine the introducing range of the three reagent and then the trial based on orthogonal test method was used to explore the relationship between gelation time and their amount of the three reagent above.The results showed that the gelation time increased with the increasing of the amount of hydrochloric acid.When its addition amount reached 0.4 mol/mol,the membranes tended to have air-like dots in it.Therefore,0.4 mol/mol was its largest additional amount.The gelation time decreased with the decreasing of the amount of ethanol.When its addition amount reached 9 mol/mol,no sol could be obtained.Therefore,9 mol/mol was its smallest additional amount.In addition,the gelation time decreased with the increasing of the amount of deioned water.When its addition amount reached 4 mol/mol,no sol could be obtained.Therefore,4 mol/mol was its largest additional amount.The result of the orthogonal test showed that the three factors had significant influence on the gelation time.The further result based on regression analysis by using SAS(Statistical analysis system) showed that the relationship between them could be described as a linear regression function.Therefore it is feasible to predict the gelation time from the equation and consequently offer an appropriate occasion to coat film.