%0 Journal Article %T Preparation and Characterization of Cross-linked Polyvinyl Alcohol Microspheres as a Novel Precoating Reagent in Dynamic Membrane
新型动态膜预涂剂交联聚乙烯醇微球的制备及表征 %A CUI Xi %A ZHANG Han-min %A YE Mao-sheng %A YANG Feng-lin %A
崔霞 %A 张捍民 %A 叶茂盛 %A 杨凤林 %J 环境科学 %D 2008 %I %X In order to modify the membrane surface by adsorbing a precoated layer, cross-linked Poly(vinyl alcohol) microspheres were prepared via an emulsion polymerization that PVA cross linked with glutaraldehyde which was extracted by anhydrous aether. Effects of concentration of PVA solution, the volume ratio of aqueous phase to oil phase, the selection of surface active agent (SAA) and its concentration on the stabilization of emulsion were studied. When the concentration of PVA solution was 2.7%, the volume ratio of PVA solution/n-heptane was 40:60 and the concentration of span-80 was 1.30g/dL, the prepared microspheres contented our needs. The size of microspheres diminished with the stirring speed increasing under the condition of enough span-80. It became smaller with the accretion of an aimed cross-linking degree which has little affection on surface charge. The contact angle of PVA microspheres with distilled water showed that these microspheres were hydrophilic. Morphology of PVA microspheres were observed by SEM. The FTIR results suggested that functional groups varied with the change of aimed cross-linking degrees. %K PVA microspheres %K membrane modification %K stabilization of emulsion %K cross-linking degree %K contact angle %K FTIR
聚乙烯醇微球 %K 膜改性 %K 乳状液稳定性 %K 交联度 %K 接触角 %K 傅立叶红外变换 %U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=D50B1404968E8151F6C4D1F7B32D1521&yid=67289AFF6305E306&vid=771469D9D58C34FF&iid=E158A972A605785F&sid=40700C9CB4E84E3B&eid=78AF84DBB4041008&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=17