Study On Modified Conducting Polyaniline Used For Transition Layer In Electrochemical Deposition

Intrinsically conducting polymer polyaniline (PANI) has excellent electrical properties and specialdoping mechanism, which results in its potential use as conducting transition layer in electrochemicaldeposition. However original polyaniline is difficult to apply to conducting transition layer due to itspoor solubility, comparatively lower conductivity and poor cohesiveness. Aimed at overcoming of thedefects mentioned above, the preparation and modification of polyaniline were studied. In this thesis,the effect of several factors in synthesis and doping processes on the properties of polyaniline has beendiscussed based on the theory of polymerization. A simple and effective method has been developed toprepare polyaniline film with high cohesiveness on non-metal substrate such as glass wafer. In addition,a new ideal about designing substituted groups has been presented and validated to improve thesolubility of polyaniline in common solvents. Some new N-substituted polyaniline and polyanilineSchiff base-Cu compound were synthesized and their physical properties were characterised. Finally,electroplating Cu on the superficial of the polyaniline film has achieved. The main contents andconclusions in the thesis are listed as follows:1. Several effect factors in synthesis and doping processes on the properties of polyaniline havestudied based on the theory of polymerization. Optimal conditions in synthesis and doping processes ofpolyaniline were obtained.2. Two kinds of N-substituted polyaniline with polar substituted group have been synthesized byepoxy ring opening reaction and nucleophilic substitution reaction. Study on epoxy ring openingmechanism with FTIR spectra manifested that the presence of acid have a catalysis effect to the reactionof epoxy ring opening. A new ideal about designing substituted groups to improve the solubility ofpolyaniline in common solvents was presented. Test results about the properties of N-substitutedpolyaniline indicated that this kind of N-substituted polyaniline has good solubility in strong polarsolvents, polar solvents and non-polar solvents, with their conductivities declined.3. Polyaniline salicylaldehyde schiff base copper (â…¡) complex compound (PASSBC) has beensynthesized through carbonyl nucleophilic addition and complex reaction of PANI. Infraredspectroscopy (IR) and X-ray photoelectron spectroscopy (XPS) studies have proved that polyanilineschiff base has formed and complexed successfully with copper (â…¡) with electronic orbit 2p3/2. This complex chemistry provided a novel and potential way to improve the conductivity of polyaniline. Theconductivity of protonic-doping PASSBC is up to 68 S/cm, 3 times higher than that of the preliminaryprotonic-doping polyaniline, due to the formation of an integral conjugation system.4. Polyaniline film with high cohesiveness on non-metal substrate was prepared by means of theepoxy group reacting with the imidogen on the polyaniline in the presence of doping acid. A graftingratio of about 7ï¼…of camphor-10-sulphonic acid (CSA) doped PANI can improve its cohesiveness from0.108 KPa to 5.1 KPa on glass, an increase of 50 times. It presents a simple and effective approach,which can prevent the hydrolyzation of coupling group in advance, to obtains polyaniline film withexcellent cohesiveness, high conductivity and good anti-water properties.5. Experimental result about the electroplating indicated that Cu could be electroplated on thesuperficial of polyaniline film.