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Son, making the polymer produces a range of movement and rearrangement, the film's structure is more compact and orderly, so the membrane average pore size decreases, while rearrangement of the network increases the porosity of holes. However, after the heat treatment time up to a certain extent, no longer increases membrane porosity, pore size and the temperature is too high will appear in the case is too small, so the heat should be controlled at the appropriate temperature range. Figure 9 heat treatment temperature on membrane properties of Fig. 9Effectofheattreatmenttemperatureonperfomlanceofthemembranes3 Conclusion The modified method can be comprehensive and balanced blend of different materials properties, preparation, or both the characteristics of each polymer blend composition has the excellent performance, completely different nature and purpose to meet their blend membranes. Transformed by a sol-gel phase prepared PVDF / PS blend membrane, found that: 1) With the expected increase of the concentration of polymer solution, the membrane pore size and porosity decreased. 2) With the PS in the casting solution increases the relative content of the membrane pore size and porosity first increases and then gradually decreased. PS content was too large, the film is not ideal. 3) the use of DMF / I) MAc mixed solvents can improve the membrane pore size,[link widoczny dla zalogowanych], porosity, with the mixed solvent DMF concentration, membrane pore size first increased and then decreased gradually, little change in membrane porosity. 4), lithium chloride on the membrane pore size and porosity of great content increases with LiCI, membrane pore size and porosity gradually increased. 5) The coagulation bath temperature on the membrane water flux do not have much impact, but the composition of coagulation bath on membrane performance has a great influence. Found: pure ethanol and isopropanol water flux maximum, minimum cyclohexane. Bath gel with the increase of ethanol content in the membrane pore size increases gradually, little change in membrane porosity. 6) With the heat treatment temperature, the membrane flux decline, 40 ℃ after the basic stable water flux, membrane porosity changes little. 7) extend the time for solvent evaporation, resulting in an average pore size decreases, thus resulting in reduced water flux, membrane porosity remain basically unchanged. References [1] Yang Yong, Sun Bin, Zou Jian, et al. Polysulfone membrane Progress alloy [J]. Polymer Materials Science and Engineering, 2000, (16) :24-28. [2] negative Yanbin,[link widoczny dla zalogowanych], Liu Liying, Yu Ma. PVDF Membranes [J]. Membrane Science and Technology, 2003,[link widoczny dla zalogowanych],23 (2): 5761. [3] negative Yanbin, Yang Lan, Liu Liying, et al. Enhanced polyvinylidene fluoride microporous membrane research [J]. Modern Chemical Industry, 2001, (21): 3437. [4] Xia Yan. Concise Course of Polymer Science [M]. Beijing: Science Press, 1989. [5] Ye Ling Bi, Liu true, Yu Heng. 1.2 micron pore size microporous membrane pore size determination method [J]. Membrane separation science and technology (Membrane Science and Technology), 1983 (3) :54-62. [6] Yin Xiuli, Tang Hua, Yang Pu Chen. PVDF / PS blend ultrafiltration membrane [J]. Water Technology,[link widoczny dla zalogowanych], 1997 (23) :131-133. [7JKestingRE. Syntheticpolymericmembranes: Astruc-ruralperspective [M]. 2ndEd. NewYork-1985. [8] SourirajanS, MatsuuraT. Reverseosmosis / uhrafihrationprocessprincipleslMJ. Ottawa: NRCC,[link widoczny dla zalogowanych], 1985. (Continued on page 2O) welcomed the purchase of \trapped Membrane Science and Technology report \Proceedings contents of the new, higher academic standards and a certain reference value. Contains a total of 123 scientific papers, nearly lO0 million words, 530 pages, beautifully printed. Priced at lO0. O0 million (plus 15% postage) To purchase, please and \In addition, the \Postal Code: 100029 Tel :010 -6445211580492417 E-mail: [link widoczny dla zalogowanych] (Editorial Staff)

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