K. Vakiparta

Counter-ion induced processibility of polyaniline: conducting melt-processible polymer blends

Summary form only given. Conducting polymer blends made by blending thermoplastic bulk polymers with Polarene/sup TM/, a proprietary conducting polyaniline composition, using conventional melt-processing techniques are reported. The percolation threshold for conductivity is observed at astonishingly low weight fractions of the conjugated conducting polyaniline indicating the formation of a unique morphology. Results on electrical and mechanical properties of these blends will be presented and discussed.

Electrically conductive compositions based on processible polyanilines — PANEPOL TM

Abstract Truly melt- and solution processible electrically conductive polyaniline (PANI) compositions can be produced commercially utilizing the technology originally developed some years ago in a joint-effort between Neste Oy and UNIAX Corporation. This technology, PANIPOL TM , utilizes PANI protonated by functionalized protonic acids in combination with proprietary plasticizers. Neste has now further developed this technology and reached semi-industrial scale production capabilities. We briefly discuss some features of fusible, conductive PANIPOL TM compositions developed specifically for use in conductive products such as injection molded articles, extruded films and fibers.

Characterizaton of polyaniline blends with AC impedance measurements

Abstract Electrical conductivity of protonated polyaniline has been measured with both direct and alternating currents. According to the AC impedance diagrams solution casted PANI salt has a very high capacitance value compared with PANI melt processed into non-conducting polymer matrices. The difference can be attributed to the level of distribution of the conducting fibrils and particles having high conductivity and capacitance. In both cases the equivalent circuit, which describes the conduction behaviour of the material, is composed from a parallel resistor- capacitor circuit in series with a resistor.

Phase behavior of polyaniline/dodecyl benzene sulphonic acid mixture

Summary form only given. Recently it has been shown that processibility of polyaniline (PANI) can be increased by using, functionalized, counter ions. Specifically it has been observed that application of extra dodecyl benzene sufphonic acid (DBSA) yields plasticized and protonated melt processible complex. Here the reaction between PANI and DBSA has been investigated by calorimetry (DSC) and dielectric thermal analysis (DETA). A phase diagram has been compiled for the PANI(DBSA)-complex formation.

On the dynamic-mechanical relaxations of polyaniline(dodecyl benzene sulphonic acid)-complex

Summary form only given. Processibility of polyaniline (PANI) can be improved by using functionalized counter ions, such as dodecyl benzene sulphonic acid (DBSA). In this work we have studied the plasticization efficiency of DBSA by using dynamic mechanical analysis (DIVIA). Compression molded sheets of PANI(DBSA)/sub x/ with varying composition have been investigated. The loss moduli show characteristic peaks according to which the efficiency of plasticization can be determined. Conductivity reaches saturation at approximately x=0.35.

Electrically conductive polypropylene-polyaniline blend in ESD protection

Melt-processable conductive polyaniline (PANI) blended with polypropylene (PP) offers a new material for controlling the electrical conductivity and thus optimize ESD protection properties of injection moulded antistatic articles. This study concentrates on the surface resistivity and ESD protection properties of PP/PANI compared to some commercial compounds of carbon black (CB) and PP.

Electrically conducting blends of polyaniline

Summary form only given. A melt-processable, conducting polyaniline composition, Polarene/sup TM/ has recently been developed. This composition allows blending and processing using conventional techniques. In this study we present results on electrical conductivity, blend morphology and mechanical properties of conducting binary blends comprising Polarene/sup TM/ and polypropylene or polystyrene, respectively.

Studies on the heat induced transition to the conducting state in polyaniele/dodecylbenzenesulphonic acid complex

Summary form only given. Polyaniline (PANI) doped with dodecylbenzenesulfonic acid (DBSA) is a new conducting polymer which combines high electrical conductivity with processability. The doping reaction of a PANIVDBSA mixture (complex) has been found to be a time-dependent process which can be accelerated by heating. This process has been studied by measuring the conductivity during heat treatment. The temperature for the onset of conductivity depends on the mixture ratio. Conductivities on the order of 1 S/cm were achieved.