Electrografting of thiophene, carbazole, pyrrole and their copolymers onto carbon fibers: electrokinetic measurements, surface composition and morphology

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• 作者：Kumru ; M. Emin ; Springer ; Jü ; rgen ; Saraç ; A. Sezai ; Bismarck ; Alexander
• 关键词：Electrocoating ; Carbon fiber ; Copolymers of pyrrole ; Carbazole ; Thiophene ; Zeta-potential ; Scanning electron microscopy ; FTIR
• 刊名：Synthetic Metals
• 出版年：2001
• 出版时间：September 24, 2001
• 年：2001
• 卷：123
• 期：3
• 页码：391-401
• 全文大小：457 K

文摘

In order to improve the surface properties of carbon fiber without affecting the mechanical properties of the reinforcing fibers, various monomers (pyrrole (Py), carbazole (Cz) and thiophene (Th)) were used to electrograft conjugated copolymers. The electrocoated carbon fibers were characterized with respect to their surface morphology and surface composition, using scanning electron microscopy (SEM) and FTIR-reflectance spectroscopy, respectively. In general very homogeneous and continuous coated carbon fiber surfaces were obtained. The pH-dependent zeta (ζ)-potential measurements were applied to characterize the surface properties of all electrocoated fibers. The performed ζ-potential measurements reflect that the surface state is strongly dependent not only on the composition of the grafted polymers (different homopolymers, copolymers and a single terpolymer), but also on the extent of doping by the counter ion from the supporting electrolyte.