UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-23 14:53
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Conference: Bucharest University Faculty of Physics 2008 Meeting


Section: Polymer Physics


Title:
Synthesis and characterization of polypyrole on metallic layers


Authors:
M. Ghiurea, A. Andronie, S.N. Stamatin, S. Iordache, M. Mocanu, L.M. Constantinescu


Affiliation:
University of Bucharest, Faculty of Physics, Polymer Departament, P.O. Box MG-11, Romania


E-mail
ghiurea@gmail.com


Keywords:
Polypyrole, electrodeposition, ion polymers metal composites,layer


Abstract:
The more compact layers show a slow but progressive increase in thickness or swelling after a longer time of storage in the electrolyte. Ion Polymers Metal composites (IPMCs) have a considerable interest leading to a number of applications in biomimetics ( electroactive polymers, artificial muscles) and electro-optical. Special attention is currently being given to the preparation of new conducting electrode coating based on composite polymers. It is expected that this strategy will improve the behavior of conducting polymers and will result in polymers designed for specific application: 1. composite materials -poly(vinyl chloride) (PVC)/polypyrole (PPy) composite membranes 2. Electrodeposition on Ti or titanium alloys for artificial muscles. 3. PP on transparent ionic conductive oxides for FET chemosensors. Recent attention has focused on the preparation of charge balance composites, via the the anodic polymerization of pyrole onto Iron, Aluminium oxide templates and Copper electrodes rising to a PP/Metal composite. Several attractive properties of PPy/Metal composites are employed by cyclic voltammetry, potentiometry, impedance measurements and scanning electron microscopy (SEM). Electrochemical experiments were performed with a potentiostat/galvanostat model voltalab 40. All potentiels were measured vs the Ag/AgCl reference electrode. The electrochemical measurements were carried out in glass cell with auxiliary electrodes made of stainlles steel . Prior to its modification the samples copper and titanium magnetron sputtered and nickel e-beam were deposited onto a glass substrate. Electrochemical polymerization of the polymers can be carried out by either potential step or potential sweep methods, using a typical coating solution 0.1M monomers in methanol. SEM, FT-IR characterizations show the nucleation and growth stage of PPy which are dependent of metal properties. The more compact layers show a slow but progressive increase in thickness or swelling after a longer time of storage in the electrolyte ( 0.1 M, Na OH).