本文通过羟氨缩合法合成了一系列不同比例“软-硬”段的PDMS-b-PPO共聚物，利用1H-NMR测定组分比，采用溶剂挥发法将其制备成膜并用于乙醇/水的渗透汽化分离，考察了PDMS-b-PPO共聚物的组分比对小分子在膜中溶解扩散性及膜微观结构的影响。利用接触角法测定了PDMS-b-PPO膜的溶解度参数，采用比重法计算了乙醇和水分子在膜中的相互作用参数及扩散系数，并通过AFM和EDS等手段对膜的微观结构进行表征。结果表明，PDMS-b-PPO膜具有微相分离的特征结构，随着膜中PDMS含量的增加，膜的微相分离结构更加明显，乙醇在膜中的溶解和扩散能力明显增强。

A series of polydimethylsiloxane-block-polyphenylene oxide(PDMS-b-PPO) copolymers with different composition of “hard-soft” segments were synthesized through the hydroxyl-amino condensation reaction. The PDMS content was calculated based on the 1H-NMR result of PDMS-b-PPO copolymers. The PDMS-b-PPO membranes were prepared via a solvent evaporation method and applied in the separation of ethanol/water mixture by pervaporation, the effects of composition on mass transfer and morphology of PDMS-b-PPO membranes were studied. The solubility and diffusion properties of ethanol and water in PDMS-b-PPO membranes were tested, and the micro-phase separation morphologies were observed by AFM and EDS. The results showed that the membranes preferentially absorbed ethanol, meanwhile,withthe increase of PDMS content in PDMS-b-PPO membrane, the diffusion ability of both ethanol and water in membranes was enhanced, andfurthermore, the ethanol increased more rapidly than the water did.

[1]时钧，袁权，高从堦。膜技术手册[M]。出版地：北京，化学工业出版社，2001：576~577。
[2]Anil K. Pabby, Syed S. H. Rizvi, Ana Maria Sastre. Handbook of Membrane Separations[M]. US: Taylor&Francis Group.
[3]刘雪春，陈翠仙，李继定。渗透物分子在渗透蒸发膜中的传质模型[J]。膜科学与技术，2009，29（5）：94～101。
[4]彭福兵，姜忠义。二元水溶液在渗透蒸发膜中的传质模型[J]。化学工程，2005,22（1）：60～64。
[5]由涛，陈龙翔，张庆文，洪厚胜。聚二甲基硅氧烷的改性技术及其渗透汽化性能的影响因素[J]。合成橡胶工业，2009,32（5）：435～439。
[6]由涛，陈龙翔，张庆文，张继民，洪厚胜。聚二甲基硅氧烷在渗透汽化技术中的研究进展[J]。化工新型材料，2009,37（9）：1～4。
[7]Kazuniko Ishihara and Kiyohide Matsui, Pervaporation of ethanol-water mixture through composite membranes composed of styrene-fluoroalkyl acrylate graft copolymers and cross-linked polydimethylsiloxane membrane[J]. Journal of Applied Polymer Science, 1987, 34, 437-440.
[8]Cheng-Liang Chang and Ming-Shih Chang, Preparation of multi-layer silicone/PVDF composite membranes for pervaporation of ethanol aqueous solutions[J]. Journal of Membrane Science, 2004, 238, 117-122.
[9]Takashi Miyata, Jun-IchiHigvchi and Hiroshi Okvno et al., Preparation of polydimethylsiloxane/polystyrene inter penetrating polymer network membranes and permeation of aqueous ethanol solutions through the membrane by pervaporation[J]. Journal of Applied Polymer Science, 1996, 61, 1315-1324.
[10]Yan Jiang, Hongyan Shi and Min Cai et al., Synthesis and characterization of PS-b-PDMS-b-PS triblockcopolymer[J]. Journal of Applied Polymer Science, 2013, 129, 247-252.
[11]Yu Nagase, Shigehiro Mori and Kiyohide Matsui, Chemical modification of poly(substituted-acetylene). Ⅳ. Pervaporation of organic liquid/water mixture through poly(1-phenyl-1-propyne)/polydimethylsiloxane graft copolymer membrane[J]. Journal of Applied Polymer Science, 1989, 37, 1259-1267.
[12]M. Krea, D. Roizard and D. Sacco, New copolyimide membranes with high siloxane content designed to remove polar organics from water by pervaporation[J]. Journal of Membrane Science, 2004, 241, 55-64.
[13]Takashi Miyata, Seiji Obata and Tadashi Uragami, Annealing effect of microphase-separated membranes containing poly(dimethylsiloxane) on their permselectivity for aqueous ethanol solutions[J]. Macromolecules, 1999, 32, 8465-8475.
[14]Takashi Miyata, Toru Takagi and Tadashi Uragami, Microphase separation in graft copolymer membranes with pendant oligodimethylsiloxanes and their permselectivity for aqueous ethanol solutions[J]. Macromolecules, 1996, 29, 7787-7794.
[15]刘威，纪树兰，秦振平，牛洪金，刘吉达。PDMS-b-PPO共聚物的合成及优先透醇性能研究[J]。北京工业大学学报，2012,38（5）：778～788。
[16]J. Neel, in Pervaporation Membrane Separation Processes[M], R. Y. M. Huang, Ed., Elsevier, Amsterdam, 1991, Chap. 1.
[17]P. J. Flory, Priciples of polymer chemistry, Cornell Univ. Press, New York, 1953.
[18]WenchangJi, SubhasK.Sikdar, Sun-TakHwang.Sorption, diffusion and permeation of 1,1,1-trichloroethane through absorbent-filled polymeric membranes[J]. Journal of membrane science, 1995, 103: 243～255.
[19]纪树兰，刘威，秦振平。用于渗透汽化膜材料的聚硅氧烷-聚苯醚嵌段物的制备方法[P]。中国，C，ZL200910236799。2009，10，30。
[20]展侠，李继定，黄军其，陈翠仙。渗透汽化优先透醇分离膜[J]。化学进展，2008，20（9）：1416～1426。
[21]K C Khulbe, T Matsuura, G Lamarche, H J Kim. The morphology characterization and performance of dense PPO membranes for gas separation[J]. Journal of membrane science, 1997, 135: 211～223.