Formation kinetics of a polyphthalazine ether sulfone ketone membrane via phase inversion
Formation kinetics of a polyphthalazine ether sulfone ketone membrane via phase inversion
复制标题
DOI：
10.1016/j.desal.2005.04.121
复制
发表时间：
2006-02
期刊：
影响因子：
9.9
通讯作者：
Peiyong Qin;Cuixian Chen;Yanbin Yun;Zhen Chen;T. Shintani;X. Li;Ji-ding Li;B. Sun
中科院分区：
文献类型：
--
作者：
Peiyong Qin;Cuixian Chen;Yanbin Yun;Zhen Chen;T. Shintani;X. Li;Ji-ding Li;B. Sun
对湿法相转化法制备酞嗪型聚醚砜酮（PPESK）膜的成膜动力学进行了实验和理论研究。利用在线光学显微镜-CCD摄像实验系统观察了膜的形态，并测量了沉淀前沿移动量X。X ~ 2值与胶凝时间t之间存在三种不同的线性关系。这一结果不同于普遍接受的结论，即在整个凝胶化过程中，X2和t之间存在单一的线性相关性。与膜的形态演变相比，认识到这三个相关性对应于三个连续的凝胶化步骤：形成皮层、形成过渡层和形成指状层。研究了流变性及其对地层动力学的影响。PPESK-NMP溶液粘度的自然对数值ln（η）对PPESK浓度C的曲线图给出了一条直线。表观粘度随温度的变化可用Arrhenius方程描述，并计算了不同PPESK浓度下的粘流活化能Eη。结果表明，ln（Eη）值随PPESK浓度的增加而单调增加，凝胶化速率随PPESK粘流活化能的增加而降低。这些结果可用于指导膜制造过程。
Formation kinetics of polyphthalazine ether sulfone ketone (PPESK) membrane via wet phase inversion process has been studied experimentally and theoretically. The membrane morphology has been observed using an online optical microscope–CCD camera experimental system and the precipitation front move X, has been measured. Three different linear correlations between the value of X2and gelation time, t, have been identified. This result is different from a commonly accepted conclusion that a single linear correlation between X2and t exists for the whole gelation process. Compared to the morphology evolution of the membrane, it is realized that these three correlations correspond to three consecutive gelation steps: formation of the skin layer, formation of the transition layer and formation of the finger layer. Rheological property and its effect on formation kinetics have also been studied. A plot of the natural logarithm value of the viscosity of the PPESK-NMP solution, ln(η ) against the PPESK concentration, C, gives a straight line. The variation of the apparent viscosity with the temperature can be described by the Arrhenius equation and the viscous flow activation energy, Eη has been calculated at different PPESK concentrations. The result shows that the value of ln(Eη) monotonously increases with the increase of the PPESK concentration, and that the gelation rate decreased with the increase of the viscous flow activation energy of PPESK. These results may be used to guide the membrane manufacturing processes.