Showing papers on "Conductive polymer published in 1980"

Conductive polymer compositions and devices

Abstract: Conductive polymer compositions comprises a polymeric material having dispersed therein (a) conductive particles composed of a highly conductive material and (b) a particulate filler. The compositions exhibit a positive temperature coefficient of resistivity and undergo a large increase in resistivity as the temperature increases above a certain value. The compositions are useful in preparing electrical devices such as current limiting devices, heaters, EMI shields and the like.

Organic metals: poly-(p-phenylene sulphide) hexafluoroarsenate

Abstract: Electrically conducting p-type films, wires, and powders (ca. 1 Ω–1 cm–1) have been prepared by the AsF5 oxidation of poly-p-phenylene sulphide, the first melt- and solution-processible polymeric precursor to a conducting polymer.

Conductive polymer electrical devices

Abstract: A method of attaching power leads to a mesh or similar electrode embedded in the surface of a conductive polymer element. A conductor, preferably also mesh, is bonded to the electrode using a conductive adhesive and a polymer layer is applied over the surface of at least the conductor, preferably also over the electrode. The polymer of the coating interpenetrates the openings of the mesh conductor and mesh electrode and bonds to the conductive polymer matrix. This mechanically holds the conductor, electrode, and conductive element in contact with each other.

Electrical devices comprising conductive polymers

Abstract: An improved means of making an electrical connection to a laminar electrode which is in contact with a conductive polymer element. A mat of conductive filaments is placed between the electrode and an apertured conductive member to which the electrical connection is made, and the electrode, the mat and the conductive member are bonded together by means of a polymer or other bonding agent. The presence of the mat between the electrode and conductive member reduces the danger of fracturing the electrode when the conductive member is bonded thereto by heat and pressure. The invention is particularly useful when an ultrasonic welding machine is used to press the conductive member through a layer of polymer to make contact with an electrode underneath the layer.

Devices comprising conductive polymers

Abstract: Electrical devices comprise a conductive polymer element and, in electrical contact therewith, a flame-sprayed layer of a metal or other highly conductive material. Electrical leads can readily be attached to the flame-sprayed layer. Particularly valuable devices are those in which at least part of the conductive polymer element is a PTC or NTC conductive polymer. The flame-sprayed layer can be formed directly by flame-spraying a suitable material onto the device, or by flame-spraying the material onto a carrier and then laminating the layer, on the carrier, to the device.

Electrically conducting polymers

Abstract: ELECTRICALLY CONDUCTING POLYMERS (February 1985) John R. Reynolds, B.S., San Jose State University, San Jose, CA, 1980 M.S., University of Massachusetts, Amherst, MA, 1982 Ph.D., University of Massachusetts, Amherst, MA, 1985 Directed by: Professor James C. W. Chi en and Professor Frank E. Karasz The development of synthetic electronic conductors and metals, in a variety of forms, has been the focus of intense research. Conducting polymers have become an important part of this field. This dissertation exmaines a few of the polymeric materials of present interest. A thorough investigation of the electronic properties of perchlorate doped polyacetylene, CCH (C104)y]j^, has been carried out. The conductivity of the polymer changes from semiconducting to values greater than 10+2 Scm\"! with doping and shows a distinct semiconductor to \"metal\" transition at 10-^ < y < 10-3. j\\^q polyacetylene films were doped using either electrochemical oxidation or a novel oxidation by ferric perchlorate allowing comparison of the two techniques. The changes in the electronic properties of a variety of arylenevinylene compounds, including poly (phenylene vinylene) (PPV), have been examined with oxidation by AsF^. Conductivities as high as 1 Scm-1 have been observed for heavily doped PPV. Specific electron paramagnetic resonance characteristics were closely studied and a possible mechanism for conduction proposed that suggests that high

Conductive polymer film humidity sensor

Abstract: A humidity sensor utilizes a conductive polymer film that normally exhibits a variable resistance characteristic. The polymer film also exhibits a humidity responsive function that can be utilized while the temperature responsive function is balanced out. The device is capable of a high level of calibration by the use of laser trimming of the conductive polymer film resistors.

Electrode coating with platinum-group metal catalyst and semi-conducting polymer

Abstract: A catalytic electrode has an electrically conductive substrate such as titanium with a coating comprising a platinum-group metal catalyst finely dispersed in a matrix consisting of a semi-conducting polymer formed in situ on the substrate. The catalyst may be a platinum-group metal oxide such as iridium oxide formed in situ together with the semi-conducting polymer by the application of a uniform liquid mixture followed by a controlled heat treatment. The semi-conducting polymer is preferably formed from polyacrylonitrile, polybenzimidazo-pyrrolone or an adamantane based polybenzoxazole.

Method for annealing PTC compositions

Abstract: A method of annealing a PTC conductive polymer composition comprising a mixture of two crystalline polymers. Compositions having improved electrical characteristics are obtained by annealing at a temperature between the melting points of the two polymers, preferably closer to the melting point of the lower melting polymer. Particularly useful results are obtained when the annealing method is applied to a self-limiting heater in which the PTC core comprises carbon black dispersed in a mixture of polymers, one of which has a melting point of at least 160° C., preferably at least 200° C., e.g. a mixture of polyvinylidene fluoride and an ethylene/tetrafluoroethylene copolymer.

Thin metalllayerrhalogenntype cell

Abstract: PURPOSE:To obtain cells with long shelf life by forming an active negative-electrode material on a conductive film by evaporation and the like, and laminating an active positive-electrode material stuck on the other conductive material, with a barrier layer and a separator being intervened CONSTITUTION:A postive-electrode material layer 2 is formed on a conductive plastic film 1 by sticking the material wherein carbon power for electric collectors and a bonding agent are mixed with halogens which are active positive electrode- materials; eg simple halogen substance such as bromide, iodine, and the like, hydrochloric acid of N aromatic heterocyclic compounds such as N bromosuccinic acid imide, and inorganic halogen compounds and the like such as copper bromide and copper iodide On the other hand a thin negative-electrode metal layer 5 of active negative-electrode materials which are silver, copper, zinc, and the like is formed on a conductive plastic film 6 by evaporation and the like A cell is fabricated by laminating and sticking these layers with a separator 3 and a barrier layer 4 being intervened By this method, a very thin cell which can maintain high output power for the long time can be obtained

Thinntype solid electrolyte cell

Abstract: PURPOSE:To obtain a cell which is reliable over a long period of time, is easy to form into a thin body and has high capacity density, by sealing hermetically with an insulative high molecular resin the peripheral portions of a negative and positive electrode current collector plates coated with a conductive high molecular material. CONSTITUTION:A negative electrode current collector plate 1 and positive electrode current collector plate 4 are coated at least surfaces facing their respective current-generating and receiving elements, for example, a lithium negative electrode 2 and positive electrode 3 consisting of a complex of iodine and poly-4-vinylpyridine with coatings 1', 4' of a conductive high molecular material. The negative and positive electrode current collector plates 1, 4 are hermetically adhered together at a flange 4'' of the outer peripheral edge of the latter collector plate with an insulative high molecular resin 5. As above-mentioned conductive coatings 1', 4', is used an epoxy resin mixed with carbon powder, conductive plastic adhesive or paint, or a conductive elastomer, while an epoxy resin or the like may be used as the high molecular resin 5.

Conductive polymer composition and its preparation

Abstract: PURPOSE:To prepare the title composition of high conductivity and stability, and good film-forming and adhesive properties, by dispersing a specific quinodimethane complex salt in a polymer having functional groups and making a three-dimentional structure using a polyfunctional crosslinking agent. CONSTITUTION:A functional group-contg polymer, a 7, 7, 8, 8- tetracyano-quinodimethane complex salt, and a polyfunctional crosslinking agent are dissolved together in a solvent such as N, N - dimethyl formamide, etc. The resulting solution is coated on, or impregnated with a base, followed by drying to make a three-dimentional structure, thus obtaining the objective composition suitable as an electrolyte material for solid electrolytic capacitors.

Synthesis and properties of electrically conducting polymers.

Abstract: SYNTHESIS AND PROPERTIES OF ELECTRICALLY CONDUCTING POLYMERS (September 1980) Gary E. Wnek, B.S. Worcester Polytechnic Institute, 1977 Ph.D. University of Massachusetts, Amherst, 1980 Directed by: Professor James C.W. Chien The recent demonstration of high electrical conductivity upon chemical doping of polyacetylene, (CH) , has generated a fundamental interest in this material. The objective of this dissertation work was to employ several approaches in the context of applied polymer science to the characterization and synthetic chemical modification of

Electronic Structure and Transport Properties of Semi-Conducting Polymers.

Abstract: : The aim of this project initially was to develop accurate non-parametric methods for determining the energy band structure of semi-conducting polymers and then to incorporate within the same model a method to determine the electron levels due to impurity atoms used as replacements for the side groups about the polymer back bone. Secondly, we were to study the energy structure of several polymers with and without impurity side groups. These tasks have been successfully accomplished. (Author)