Electrical properties of polyaniline/sulfonated polycarbonate blends

Lee, Wan-Jin; Kim, Yong-Ju; Kaang, Shinyoung

doi:10.1016/s0379-6779(00)00216-2

Cited by 57 publications

(30 citation statements)

References 16 publications

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“…29 This is due to the fact that thermal energy transport mechanism in conducting polymers is dominated by phonon assisted mechanism, whereas electrical conduction is dominated by the variable range hopping process and metallic diffusion of electrons. 30 The effective thermal parameters of composites depend on the thermal properties of its constituents as well as on the microstructural parameters such as volume fraction of each phase, shape, size, and distribution of the particles. Hence a study on the correlation between thermal diffusivity and hardness of the material was carried out, wherein, the surface hardness of all the specimens under investigation were measured using the indentation technique (Shore D hardness technique).…”

Section: Resultsmentioning

confidence: 99%

Thermal characterization of doped polyaniline and its composites with CoPc

et al. 2004

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Thermal diffusivity of the composites of camphor sulphonic acid (CSA) doped polyaniline (PANI) and its composites with cobalt phthalocyanine (CoPc) has been measured using open cell photoacoustic technique. Analysis of the data shows that the effective thermal diffusivity value can be tuned by varying the relative volume fraction of the constituents. It is seen that polaron assisted heat transfer mechanism is dominant in CSA doped PANI and these composites exhibit a thermal diffusivity value which is intermediate to that of CSA doped PANI and CoPc. The results obtained are correlated with the electrical conductivity and hardness measurements carried out on the samples.

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Section: Resultsmentioning

confidence: 99%

Thermal characterization of doped polyaniline and its composites with CoPc

et al. 2004

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“…The modified materials thus prepared showed that, as expected, the permeability of electroactive probe molecules was pH dependent and that the ionexchange capacity (mmol/g) values, as measured with the Fisher and Kunin method, [37][38][39] fell within the range that characterizes commercial ionexchange membranes. 3 , and Na 2 CO 3 were purchased from J. T. Baker, and LiCl was purchased from Fluka Chimie.…”

Section: Introductionmentioning

confidence: 73%

“…The preliminary characterization of membranes 1 and 2 was carried out with the method reported by Fisher and Kunin, [37][38][39] as described in the Experimental section. The titration curves resulting from these experiments are shown in Figure 2, and interestingly, in both cases, the presence of acidic or basic functional groups in the dendrimer-containing materials could easily be detected by simple comparison with the curves associated with the unmodified CA membrane.…”

Section: Resultsmentioning

confidence: 99%

“…[37][38][39] In this way, a known weight of the prepared cationic or anionic membranes were immersed in 0.1M solutions of either HCl or NaOH, respectively, for 20 min. After careful rinsing with plenty of DI water to remove the remaining acid or base, the cationic or anionic membranes were introduced into a 10-mL flask containing DI water and titrated with 0.1 mM solutions of either NaOH or HCl.…”

Section: Characterization Equipment and Methodsmentioning

confidence: 99%

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Preparation and study of cellulose acetate membranes modified with linear polymers covalently bonded to Starburst polyamidoamine dendrimers

Ledesma‐García

Orozco

Antaño

et al. 2008

J of Applied Polymer Sci

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Novel ion-selective membranes were prepared by means of the noncovalent modification of a cellulose acetate (CA) polymer with either poly(ethylene-altmaleic anhydride) or poly(allylamine hydrochloride) chains covalently linked to Starburst amine-terminated polyamidoamine (PAMAM) dendrimers generations 4 and 3.5, respectively. Linear polymer incorporation within the porous CA membrane was performed with mechanical forces, which resulted in modified substrates susceptible to covalent adsorption of the relevant dendritic materials via the formation of amide bonds with a carbodiimide activation agent. The membranes thus prepared were characterized by chemical, physical, and spectroscopic measurements, and the results indicate that the dendrimer peripheral functional groups were the species that participated in the ion-exchange events. The prepared materials were also evaluated for their ion-exchange permeability with sampled current voltammetry experiments involving cationic and anionic species {[Ru(NH 3 ) 6 ] 3þ and [Fe (CN 6 )] 3À , respectively} as redox probe molecules under different pH conditions. As expected, although permeability was favored by opposite charges between the dendrimer and the electroactive probe, a clear blocking effect took place when the charge in the dendritic polymer and the electroactive complex was the same. Electrochemical impedance spectroscopy measurements, on the other hand, showed that the PAMAM-modified membranes were characterized by good selectivity and low resistance values for multivalent ions compared to a couple of commercial ion-exchange membranes.

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“…Among the insulating polymers which have been studied for these applications are poly(methyl methacrylate), 25,26 polyesters, 25,26 poly(vinyl alcohol), 27 poly(vinyl chloride), 28 and polycarbonates. 29 The very good film-forming capabilities of cellulose derivatives would seem to make them excellent candidates as matrices for PANi for such applications, and a number of studies were reported on blends of PANi with the ester cellulose acetate. 30 -35 However, both the film quality and the hydrophobicity of cellulose esters depend markedly on the derivative used and the processing conditions.…”

Section: Introductionmentioning

confidence: 99%

Spectral and electrochemical studies on blends of polyaniline and cellulose esters

Marques

Brett

Monkman

et al. 2002

J of Applied Polymer Sci

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Blends of chemically prepared polyaniline emeraldine base (PANi) with cellulose esters were studied as films by UV-visible spectroscopy and cyclic voltammetry. The cellulose esters used were acetate, propionate, acetate butyrate, and acetate hydrogen phthalate. Films were prepared by casting from N-methylpyrrolidone or formic acid, and the effect of doping by acids on their spectral and electrochemical properties was studied. Similar behavior was observed with the acetate, propionate, or acetate butyrate, with spectral changes on adding acid due to protonation of the PANi. In agreement with previous studies, kinetic measurements on PANi in a cellulose acetate matrix shows a relatively slow spectral change on protonation. In contrast, with cellulose acetate hydrogen phthalate (CAHP), no changes were observed on adding acid, and it is suggested that the hydrogen phthalate group acts as proton donor. This was mirrored by the cyclic voltammetry behavior in hydrochloric acid solution. Electrochemical studies on films of PANi/CAHP blends in different relative proportions in sulfuric acid solution show a marked dependence on the solvent used for casting, with higher currents and better electrical conductivity being observed in films prepared from N-methylpyrrolidone. This is shown to be due to the presence of PANi particles in the films.

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Electrical properties of polyaniline/sulfonated polycarbonate blends

Cited by 57 publications

References 16 publications

Thermal characterization of doped polyaniline and its composites with CoPc

Thermal characterization of doped polyaniline and its composites with CoPc

Preparation and study of cellulose acetate membranes modified with linear polymers covalently bonded to Starburst polyamidoamine dendrimers

Spectral and electrochemical studies on blends of polyaniline and cellulose esters

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