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In Situ Electrochemical Crosslinking Procedure for control of Polymer Film Properties

IP.com Disclosure Number: IPCOM000052283D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 3 page(s) / 38K

Publishing Venue

IBM

Related People

Kaufman, F: AUTHOR [+3]

Abstract

Linear electroactive polymers can be spin cast to form films on electro for use as electrochromic displays [1], batteries (2] and electrochemically selective electrodes [3]. As previously described, these films can be used after spinning and without further treatment, in any solvent which does not dissolve the polymer. In general, however, it would be desirable to have polymer films which could be treated so that they showed excellent substrate adhesion to any surface and which could be used with a variety of solvents. A procedure is described whereby this can be accomplished. In addition, it is shown that this treatment can lead to an improvement in a number of the desirable physical properties of the films.

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In Situ Electrochemical Crosslinking Procedure for control of Polymer Film Properties

Linear electroactive polymers can be spin cast to form films on electro for use as electrochromic displays [1], batteries (2] and electrochemically selective electrodes [3]. As previously described, these films can be used after spinning and without further treatment, in any solvent which does not dissolve the polymer. In general, however, it would be desirable to have polymer films which could be treated so that they showed excellent substrate adhesion to any surface and which could be used with a variety of solvents. A procedure is described whereby this can be accomplished. In addition, it is shown that this treatment can lead to an improvement in a number of the desirable physical properties of the films.

It is shown here how the solubility and spin-casting properties of a linear polymer chain can be combined with the adhesion, resistance to solvents and structural rigidity of a crosslinked polymer film. This is accomplished by the synthesis of a specifically functionalized polymer which is soluble and can be spin-coated to form a film on an electrode. Subsequent electrolysis of this soluble film converts the film into a crosslinked form. The degree of crosslinking is controlled by the polymer functionalization and/or the extent of electrolysis.

Specifically, 1,3 diphenyl Delta/2/5- Delta p-phenoxy pyrazoline was synthes and attached to poly (vinyl-benzyl chloride) using established procedures. This polymer was coated onto a metallic substrate from the solvent. Before doing electrochemistry on these films, it was observed that the film could be readily dissolved off the substrate in a number of solvents, such as THF, DMF, CH(2)Cl(2), etc. After electrolyzing the film in CH(3) CN (0.1 N T.E.A.P.), either potentiostatically (0.85 V vs SCE) or via cycling, it was observed that the polymer film's properties had been changed. Specifically,
1. The original absorption spectrum (figure, dotted line)

was observed to be altered to Spectrum A, i.e., shifted

to lower energy.
2. The electrolyzed film was found to be insoluble in DMF

solvent. It could not be washed off.
3. The electrolyzed film could itself be electrolyzed, i.e.,

it was elec...