Preparation of poly(vinyl amine)-grafted crosslinked poly(vinyl alcohol) microspheres

被引：0
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作者：
Gao, Baojiao [1 ]
Lu, Jinhua [1 ]
Zhuang, Rubin [1 ]
Zhang, Guohai [1 ]
机构：
[1] Department of Chemical Engineering, North University of China, Taiyuan 030051, China
来源：
Journal of Applied Polymer Science | 2009年 / 114卷 / 06期
关键词：
Crosslinked poly(vinyl alcohol) (CPVA) microspheres were first prepared via the suspension polymerization of vinyl acetate and the alcoholysis of poly (vinyl acetate). Afterwards; a two-step method involving graft polymerization and Hofmann degradation was used to prepare functional poly(vinyl amine)-grafted crosslinked poly(vinyl alcohol) (PVAm-CPVA) microspheres; onto which poly(vinyl amine) (PVAm) macromolecules were grafted. The graft polymerization of acrylamide (AM) on CPVA microspheres was performed with cerium salt as the initiator in an acidic aqueous medium; resulting in polyacrylamide (PAM)-grafted CPVA microspheres. Subsequently; the grafted PAM was transformed into PVAm via the Hofmann degradation reaction; and PVAm-CPVA microspheres were prepared. The effects of the main factors on the graft polymerization and Hofmann degradation were examined; and the reaction mechanisms were researched in depth. The experimental results showed that for the graft polymerization of AM on CPVA microspheres initiated by cerium salt; the acid concentration and the amount of cerium salt affected the grafting degree of PAM greatly. For the Hofmann degradation reaction of the grafted PAM; the amination degree of PVAm-CPVA microspheres was obviously affected by the amount of sodium hypochlorite in the presence of sodium hydroxide. The preliminary adsorption tests showed that PVAm-CPVA microspheres were multifunctional and had strong adsorption ability for Fe(III) ions by chelation action and for chromate ions (CrO 2-4 ) by strong electrostatic interactions. © 2009 Wiley Periodicals; Inc. J Appl Polym Sci 114: 3487-3494; 2009;
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页码：3487 / 3494
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