The effects of polymer concentration , solvent volatilization time , temperature and composition of coagulation bath and the thickness of membranes are studied for preparing the best nanofiltration membrane 实验重点考察了铸膜液固含量、溶剂蒸发时间、凝胶浴组成和温度、膜厚等因素对所制纳滤膜性能的影响。
The optimized process parameters are : the concentration of casting solution is higher than 9wt % , casting speed is 0 73m / min , temperature of wash bath is 45 and post - treatment is used 当铸膜液浓度在9wt以上，刮膜速度为0 . 73m min ，水洗浴温度为45 ，并增加热处理和塑化处理时，膜的分离性能较好。
With a decreasing cellulose concentration of casting solution or an increasing temperature of coagulation bath , the mean pore ssze becomes larger , resulting in higher pure water flux and lower rejection of bsa 随着铸膜液浓度的降低或凝固浴(纯水)温度的升高，膜的水通量有较大的提高，但截留率会明显下降。
As the concentration of pes solution increases , the pure water flux decreases and the clearance rates of low - molecular weight substances such as urea and creatintine first increase , then decrease , and increase slightly at last 随着铸膜液浓度的上升，水通量呈现总体下降的趋势；膜对低分子物质的去除率先上升，然后下降，随后又略有上升。
With an increase of nmmo concentration of coagulation bath or concentration of casting solution , the crystallinity of membrane increases . however , an increase of temperature of coagulation bath is accompanied by a decrease of crystallinity of membrane 膜的结晶度随铸膜液浓度、凝固浴浓度、刮膜速度的增加而增大，随凝固浴温度的升高而降低。
The effect of casting solution compositions and preparation conditions on membrane structure and performance was discussed . modern instrumental analysis was used to investigate the membrane surface , cross - section and inner section 探讨了铸膜液组成及制备条件对膜性能和结构的影响,并采用现代仪器分析手段对膜的表面、截面和内部结构进行了研究和分析。
The determination of the cloud point of pu - sio2 , pes - sio2 suspensions was obtained by titration . the results showed that the addition of si02 with a high specific surface made polymer chains adsorbed at the surface , influenced the phase behavior of suspensions , shifted the bimodal to lower nonsolvent concentrations , and the water tolerance became bad 实验证明，具有高比表面积、多孔性的sio _ 2对pu 、 pes铸膜液的相行为有较大影响，随着sio _ 2加入，双节线向聚合物-溶剂轴移动，均相区变小，分相区变大，分相时需要非溶剂的量变小，铸膜液的耐水性变差。
The article is focused on the modification studies of chitosan ultrafiltrating compound membrane ( cs compound membrane ) on the basis of preceding researches . it includes adding cross - linking agent , modification agent , acylation agent in the casting membrane solution . the result shows that the new modification membrane are better in the phychemical properties and separation properties 本文是在前面研究的基础上，着重进行了聚氨基葡糖复合超滤膜(简称cs复合膜)的改性研究.通过从交联剂、改性剂、乙酰化试剂等方面的改性来寻求最佳的铸膜液配方.结果表明，改性后的膜能达到较好的物化性能和分离性能
The dual - bath coagulation method suggested by j . a . va n ' t hof could be used in membranes with high selectivity clearance rate of low - molecular weight substances and moderate water flux theoretically . therefore it may be applied in the field of hemofiltration . to improve and optimize the performance of the pes ultrafiltration membrane applied in the hf , here the flat membranes and hollow fiber ( hf ) membranes are made in certain conditions based on the dual - bath coagulation method where pes is used as the membrane material , dmso as solvent and pvp & peg as additives this paper includes five parts as follow : 1 为了改善和优化聚醚砜超滤膜(单浴法)在血液过滤实际应用中的性能，本论文以j . a . van ' thof等提出的双凝固浴法为基础，以聚醚砜( pes )为主要成膜材料，以二甲基亚砜为溶剂，并添加一定分子量的致孔剂( pvp ，聚乙烯吡咯烷酮)以及一定分子量的添加剂( peg ，聚乙二醇)按照一定配比在一定温度下制成透明均一的铸膜液，静置脱泡后在一定的工艺条件下制成聚醚砜平板膜和中空纤维膜，然后通过测试膜的结构和性能来评估其用于血液过滤中的前景。
This is due to three reasons : ( 1 ) sio2 influenced the phase behavior of suspensions , shifted the bimodal to lower nonsolvltil concentrations , so that it changed the skin characteristics and pore structure . ( 2 ) there was a kind of interfaeial micro - void ( this is the spaces between the phase of polymer matrix and distributive sio2 particles or ca phase ) existing in the membrane . this enhanced interconnectivity of the membrane pores 原因在于： sio _ 2影响铸膜液的分相条件，继而影响膜的表皮成孔性和膜孔结构； sio _ 2在膜基质中的存在，使平板膜变为多相结构，相与相之间的界面空隙形成了界面微孔，增加了膜孔的连通性： sio _ 2表面有许多si - oh基团，增加了膜的亲水性。
