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首页> 外文期刊>Journal of Applied Polymer Science >pH-dependent permeation through polysulfone ultrafiltration membranes prepared by ultraviolet polymerization technique
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pH-dependent permeation through polysulfone ultrafiltration membranes prepared by ultraviolet polymerization technique

机译：通过紫外线聚合技术制备的聚砜超滤膜的pH依赖性渗透

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摘要

pH-sensitive poly(acrylic acid)-grafted membranes were prepared by an ultraviolet irradiation technique in air at room temperature. Peroxides produced on the membrane surface was quantified by 1,1-diphenyl-2-picrylhydrazyl (DPPH), which indicated that there existed an effective irradiation time for graft polymerization. Through X-ray photoelectron spectroscopy (XPS) measurements, the effective thickness of poly(acrylic acid) grafted onto the surface of a polysulfone membrane was determined to be around 80-100 nm. pH-dependent permeation behavior was noted from the permeation of riboflavin as a model solute. A distinctive flux decline of riboflavin appeared in the range of pH 4-5. Therefore, the flux of the intelligent membrane was controlled by changes in the pH of the external solution, attributed to the changes in the conformation of the grafted chains of poly(acrylic acid), because of the electrostatic force among the dissociated carboxyl groups.
机译：pH敏感的聚丙烯酸接枝膜是通过紫外线照射技术在室温下于空气中制备的。膜表面产生的过氧化物通过1,1-二苯基-2-吡啶并二肼（DPPH）进行定量，表明存在有效的接枝聚合辐照时间。通过X射线光电子能谱（XPS）测量，接枝到聚砜膜表面上的聚丙烯酸的有效厚度确定为约80-100nm。从核黄素作为模型溶质的渗透中注意到pH依赖的渗透行为。在pH 4-5范围内，核黄素的通量明显下降。因此，由于离解的羧基之间的静电力，归因于聚（丙烯酸）的接枝链的构象的变化，智能膜的通量由外部溶液的pH变化控制。

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