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首页> 外文期刊>Journal of Applied Polymer Science >GAS-PHASE PHOTOINDUCED GRAFT POLYMERIZATION OF ACRYLIC ACID ONTO POLYACRYLONITRILE ULTRAFILTRATION MEMBRANES
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GAS-PHASE PHOTOINDUCED GRAFT POLYMERIZATION OF ACRYLIC ACID ONTO POLYACRYLONITRILE ULTRAFILTRATION MEMBRANES

机译：气相光诱导接枝丙烯酸在聚丙烯腈超滤膜上的接枝聚合

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摘要

Heterogeneous surface modification of polyacrylonitrile (PAN) ultrafiltration (UF) membranes is realized with UV irradiation-initiated graft polymerization of acrylic acid (AA) from the gas phase onto photoinitiator (benzaphenone, BP)-coated samples. In the absence of monomer, PAN functionalization by ketyl radicals dominates after UV excitation of sorbed BP. With AA, graft and total polymer yield increase with BP loading and UV irradiation time. Average molecular weight and distribution of PAA homopolymer-formed in parallel during graft polymerization-are analyzed with gel permeation chromatography. Morphology of PAN-gr-AA UF membranes is checked with scanning electron micrographs (SEMs) and atomic force microscopy. Chemical changes are characterized with FTIR-ATR spectroscopy and SEM/EDX analyses, indicating a pronounced surface selectivity of the graft polymer modification (localized in the upper 5-mu m membrane thickness). The amount of grafted PAA systematically reduces membrane permeability and increases dextrane retention, as verified in UF experiments. Photo graft polymer modification of UF membranes will be applied to adjust membrane performance by controlling surface hydrophilicity and permeability using other monomers and/or further graft polymer functionalization. (C) 1995 John Wiley and Sons, Inc. [References: 44]
机译：聚丙烯腈（PAN）超滤（UF）膜的异质表面改性是通过紫外线（UV）辐照将丙烯酸（AA）从气相转移到光引发剂（苯甲酮，BP）涂覆的样品上而实现的。在不存在单体的情况下，在紫外线激发吸附的BP后，酮基自由基对PAN的功能化起主导作用。使用AA，接枝和总聚合物产量随BP负载量和紫外线照射时间而增加。用凝胶渗透色谱分析在接枝聚合过程中平行形成的PAA均聚物的平均分子量和分布。 PAN-gr-AA UF膜的形态用扫描电子显微镜（SEM）和原子力显微镜检查。化学变化通过FTIR-ATR光谱和SEM / EDX分析进行表征，表明接枝聚合物改性的表面选择性明显（位于5微米以上的膜厚区域）。如超滤实验所示，接枝PAA的数量会系统地降低膜的通透性并增加右旋糖酐的保留率。 UF膜的光接枝聚合物改性将用于通过使用其他单体控制表面亲水性和渗透性和/或进一步的接枝聚合物官能化来调节膜性能。 （C）1995 John Wiley and Sons，Inc. [参考：44]

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