摘要
采用浊点滴定法,通过控制改性剂TiO_2浓度及环境温度研究L-S相转化法成膜过程热力学机理。以PEG为成孔剂,采用L-S相转化法制备聚砜超滤膜,通过控制改性剂TiO_2的浓度、凝胶浴温度及溶出时间研究L-S相转化法成膜过程中PEG的溶出动力学。实验结果表明:随着铸膜液中TiO_2浓度的升高,浊点曲线逐渐靠近溶剂轴,铸膜液对非溶剂的容纳能力降低;浊点曲线随滴定温度的升高逐渐远离溶剂轴,铸膜液对非溶剂的容纳能力提高。随着TiO_2浓度的升高,成膜过程中PEG的溶出量逐渐升高,PEG的溶出速率逐渐增大; PEG的溶出量随凝胶浴温度的升高逐渐降低,溶出速率逐渐减小;随着溶出时间的延长,PEG的溶出量逐渐增加并趋于稳定,PEG溶出速率减小。
This article used the muddy trickle method,by controlling the modifier TiO2 concentration and temperature research L-S phase catalysis mechanism of film forming process thermodynamics. With PEG as the pore forming agent,using L-S phase catalysis preparation of polysulfone ultrafiltration membrane. By controlling the modifier TiO2 concentration,coagulation bath temperature and dissolution time study L-S PEG in the process of phase conversion film dissolution kinetics. The experimental results show that: With the increase of concentration of TiO2 in the casting solution. Cloud point curve gradually close to the solvent shaft,On the capacity of the solvent casting solution; Cloud point with the temperature increasing of titration curve away from the solvent shaft,on the capacity of the solvent casting solution. With the increase of concentration of TiO2,the dissolubility of PEG in the process of film forming,dissolution rate of PEG increased gradually;The dissolubility of PEG with the temperature increasing of coagulation bath gradually reduce,dissolution rate gradually decreased; As the extension of dissolution time,gradually increase the dissolubility of PEG and tends to be stable,PEG dissolution rate decreased.
作者
康永
KANG Yong(Yulin Hanting Chemical Technology &Development Co.,Ltd.,Yulin,Shaanxi 718100)
出处
《精细石油化工进展》
CAS
2018年第5期30-38,共9页
Advances in Fine Petrochemicals
关键词
热力学机理
溶出动力学
浊点滴定法
凝胶浴
聚砜超滤膜
thermodynamic mechanism
dissolution kinetics
turbidimetric titration method
gel bath
polysulfone ultrafiltration membrane
