Thermal degradation of the electrical conductivity in polyaniline and polypyrrole composites

Dalas, E.; Sakkopoulos, S.; Vitoratos, E.

doi:10.1016/s0379-6779(00)00266-6

Cited by 44 publications

(31 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It appears that the conductivity decay in the current system cannot be simply described by the kinetics suggested by these authors. Discrepancies with the above mechanisms were also reported by others (Sakkopoulos et al, 1998;Dalas et al, 2000).…”

mentioning

confidence: 51%

Electrically Conductive Fibre Composites Prepared from Polypyrrole-Engineered Pulp Fibres

Huang

Kang

2008

Can. J. Chem. Eng.

View full text Add to dashboard Cite

E lectrically conductive composite materials have applications such as electrostatic dissipation and electromagnetic shielding. They are manufactured by dispersing conductive fi llers such as metal particles, carbon black, graphite or carbon fi bres in a polymer matrix. With the increasing environmental awareness around the globe, materials that pose less threat to the environment are now receiving more and more attention from researchers and the industry.As a renewable natural resource with good mechanical properties, cellulose fi bre enjoys advantages over other polymeric materials in environmental friendliness. The previous work (Huang et al., 2005) (referring to the modifi cation of the bulk or surface properties of pulp fi bres to produce desired fi bre attributes (Baum, 2002)) by following the in situ chemical polymerization to deposit polypyrrole on fi bre surfaces so that the cellulose fi bres become electrically conductive. In addition, the processability of the intrinsically conducting polymer (ICP) was greatly improved through the versatile formability of the fi bre substrates. The small amount of ICP introduced will not have much impact on the overall biodegradability of the material.In this research work, electrically conductive paper composites were prepared from polypyrrole-engineered pulp fi bres by two methods: (a) exclusively from such engineered fi bres; and (b) from a mixture of the modifi ed fi bres and unmodifi ed ones. Both composites were investigated for their conductivity and strength properties as a function of monomer dosage or percentage of treated fi bres in the mixture. It was found that, for the "mixture" method (i.e., by adding treated fi bres as conductive fi llers), less monomer (i.e., conductive polymer) was needed to achieve the same conductivity while a higher tensile strength in the paper was attained when comparing with paper obtained exclusively from treated fi bres. The percolation model was adopted to describe such paper-conducting polymer composites, and the much lower percolation threshold achieved through the "mixture" method can be explained by a multiple-percolation theory. The long-term environmental aging stability of these composites was also monitored, and attempts were made to interpret the observed conductivity decay through existing kinetic models.Dans ce travail de recherche, des composites de papier électriquement conductifs ont été préparés à partir de fi bres de pâte traitées au polypyrrole par deux méthodes : (a) exclusivement à partir de fi bres traitées par cette méthode et (b) à partir d'un mélange de fi bres modifi ées et non modifi ées. Les deux composites ont été étudiés quant à leurs propriétés de conductivité et de résistance mécanique en fonction du dosage de monomères ou du pourcentage de fi bres traitées dans le mélange. On a trouvé que pour la méthode du « mélange » (en ajoutant des fi bres traitées comme agents de remplissage conductifs), on a besoin de moins de monomères (polymère conductif) pour atteindre la même conductivité, alors qu'un...

show abstract

mentioning

confidence: 51%

Electrically Conductive Fibre Composites Prepared from Polypyrrole-Engineered Pulp Fibres

Huang

Kang

2008

Can. J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…The doped PANI samples displayed no distinctive loss of conductivity when treated at temperatures 40-200 1C for 2 h. For temperatures over 200 1C, their conductivity began to decrease very fast. Dalas et al (2000) attributed thermal degradation of the composites to a release of HCl from the samples, which reduced the protonatedconducting phase. They reported specifically, for the HCl dopant case, TGA and elemental analysis data gave evidence of several chemical transformations: (i) a slight dedoping due to HCl evolution, (ii) oxidation of the polymer backbone and (iii) chlorination of the rings.…”

Section: Effect Of Temperature On Conductivity Of P(vdc-co-vac)/pani mentioning

confidence: 99%

Enhancement of conductivity in polyaniline-[poly(vinylidene chloride)-co-(vinyl acetate)] blends by irradiation

Bodugoz-Senturk

Güven

2011

Radiation Physics and Chemistry

View full text Add to dashboard Cite

“…The effects of aging on the electrical conductivity of polymers have been investigated by several researchers (Knappe and Yamamoto 1970;Dalas, Sakkopoulos, and Vitoratos 2000;Kieffel et al 2002;Mamunya et al 2002;Das, Chaki, and Khastgir 2003). This research has predominantly focused on the degradation of the electrical conductivity of intrinsically conducting polymers such as polypyrrole and polyanline.…”

Section: Introductionmentioning

confidence: 99%

Aging-Induced Electrical Resistance Changes in an RDX-Loaded Nitrate Ester Propellant with Polyglycol Adipate (PGA) and Polyethylene Glycol (PEG) Cross-Linked Binders Subject to Various Thermal and Moisture Environmental Conditions

McDonald

Marshall

2016

Journal of Energetic Materials

View full text Add to dashboard Cite

Two Cyclotrimethylenetrinitramine (RDX)-loaded nitrate ester propellant formulations with polyglycol adipate and polyethylene glycol binders, respectively, are subjected to accelerated aging at 70°C in various humidity environments ranging from 0 to 100% relative humidity (RH). The electrical resistance of each sample is monitored throughout aging, along with highperformance liquid chromatography (HPLC) and gas chromatography (GC) used to measure the mass fraction of the stabilizers and nitroso/nitro derivatives at the beginning and end of aging. Stabilizer and nitroso/nitro derivative dimethyl sulfoxide (DMSO) solutions are used to evaluate the electrical resistance of these species as a function of mass fraction. The results indicate a weak correlation of the sample electrical resistance with stabilizer and nitroso/nitro mass fraction and a strong correlation with the moisture content of the sample. Moisture is postulated to affect the electrical resistance of the samples predominately by acid induced hydrolytic decomposition of the nitrate esters present and then further the crosslinked polymeric binders, causing an elevation of the mass fraction of acid species and a decrease in the sample pH.

show abstract

Thermal degradation of the electrical conductivity in polyaniline and polypyrrole composites

Cited by 44 publications

References 15 publications

Electrically Conductive Fibre Composites Prepared from Polypyrrole-Engineered Pulp Fibres

Electrically Conductive Fibre Composites Prepared from Polypyrrole-Engineered Pulp Fibres

Enhancement of conductivity in polyaniline-[poly(vinylidene chloride)-co-(vinyl acetate)] blends by irradiation

Aging-Induced Electrical Resistance Changes in an RDX-Loaded Nitrate Ester Propellant with Polyglycol Adipate (PGA) and Polyethylene Glycol (PEG) Cross-Linked Binders Subject to Various Thermal and Moisture Environmental Conditions

Contact Info

Product

Resources

About