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|Title:||XPS characterization of surface functionalized electroactive polymers|
|Authors:||Loh, F.C. |
|Source:||Loh, F.C.,Tan, K.L.,Kang, E.T.,Kato, K.,Uyama, Y.,Ikada, Y. (1996-09-16). XPS characterization of surface functionalized electroactive polymers. Surface and Interface Analysis 24 (9) : 597-604. ScholarBank@NUS Repository.|
|Abstract:||Surface modification and functionalization of polyaniline (PAN) and polypyrrole (PPY) films were achieved by Ar plasma treatment, near-UV-induced graft copolymerization with acrylic acid (AAc) and covalent immobilization of an enzyme (trypsin). The compositions and structures of the modified and functionalized polymer surfaces were characterized by angle-resolved XPS. Argon plasma treatment results in minor oxidations of the carbon atoms but is accompanied by a significant decrease in the intrinsic oxidation state ([=N-]/[-NH-] ratio) of the polymers. Graft copolymerization with AAc readily gives rise to self-protonated PAN and PPY surface structures. The surface concentration of the grafted AAc polymer increases with increasing monomer concentration and near-UV irradiation time during grafting but decreases with increasing plasma pretreatment time. Covalent immobilization of trypsin on the AAc-polymer-grafted PAN and PPY films is facilitated by the use of water-soluble carbodiimide intermediate (WSC). The effective enzyme activity increases initially with increasing surface concentration of the grafted AAc polymer, but becomes saturated at moderate to high AAc polymer concentration.|
|Source Title:||Surface and Interface Analysis|
|Appears in Collections:||Staff Publications|
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