摘要:
A novel proton conductor which is usable in dry atmosphere or in a relatively wide temperature range including room temperatures and is remarkably improved in proton conductivity; a process for the production thereof; and electrochemical devices. Specifically, a proton conductor made of a fullerene having a proton-liberating functional group bonded thereto through an at least three-membered ring structure; electrochemical devices made by using the same; and a process for the production of the above proton conductor which comprises preparing a fullerene derivative to which a functional group having an ester group is bonded through an at least three-membered ring structure, hydrolyzing this derivative with an alkali hydroxide, and subjecting the resulting hydrolyzate to ion exchange to form a proton-liberating group.
摘要:
The present invention relates to electroconductive inks and methods of making and using the same. The electroconductive inks include carbon fibrils and a liquid vehicle. The electroconductive ink may further include a polymeric binder. The electroconductive filler used is carbon fibrils which may be oxidized. The ink has rheological properties similar to that of commercially available electroconductive inks that use carbon black as their filler. The ink can be screen-printed, slot-coated, sprayed, brushed or dipped onto a wide variety of substrates to form an electroconductive coating.
摘要:
A polymer composite composed of a polymerised mixture of functionalized I carbon nanotubes and monomer which chemically reacts with the functionalized nanotubes. The carbon nanotubes are functionalized by reacting with oxidising or other chemical media through chemical reactions or physical adsorption. The reacted surface carbons of the nanotubes are further functionalized with chemical moieties that react with the surface carbons and selected monomers. The functionalized nanotubes are first dispersed in an appropriate medium such as water, alcohol or a liquefied monomer and then the mixture is polymerised. The polymerisation results in polymer chains of increasing weight bound to the surface carbons of the nanotubes. The composite may consist of some polymer chains imbedded in the composite without attachment to the nanotubes. The resulting composite yields superior chemical, physical and electrical properties over polymer composites that are only physically mixed and without binding to the surface carbons of the nanotubes.
摘要:
Described is a compliant and crosslinkable thermal interface material of at least one malenized rubber with maleic anhydride adducted to the molecule and at least one hydroxyl terminated olefin rubbers, and a method of making and using same; as well as a method of improving thermal conductivity of polymer systems.
摘要:
A composition and method for applying an electrically conductive coating to an initially electrically nonconductive surface, such as a printed wiring board having through holes is disclosed. The method is carried out by applying a composition of electrically conductive carbon particles, a second conductive material, a water dispersible binding agent, and an aqueous dispersing medium to a nonconductive substrate to form a substantially continuous, electrically conductive coating. Enough of the carbon particles are present to provide an electrically conductive coating when the compositions is applied to the substrate. Enough of the second conductive material is present to provide an improved electrically conductive coating when the composition is applied to the substrate. The resulting coating carbon coating has an improved conductivity over prior through hole coating compositions and processes and is capable of being exposed to molten solder without resulting in the formation of blowholes.
摘要:
A rubber composition containing carbon fibrils in which 0.5 to 60parts by weight of carbon fibril material comprised primarily of an aggregate of fibrils having an average particle diameter of 0.05 to 50 νm in which fine, filiform carbon fibrils of 3.5 to 75 nm in diameter are intertwined with each other is mixed with 99.5 to 40 parts by weight of synthetic rubber and/or natural rubbher and a pneumatic tire in which the surface layer is provided with this rubber composition. Vulcanized rubber of high hardness, high strength, high wear resistance and conductivity can be obtained while processing capacity is maintained. In addition, the tires can be made ligther.
摘要:
A discharge lamp (12), such as a neon lamp or a subminiature fluorescent lamp, includes an elongated tubular lamp envelope (22) containing a fill material for supporting a light-emitting discharge and electrodes (24,26) mounted at opposite ends of the lamp envelope (22). A light-transmissive conductive coating (40) on the lamp envelope (22) substantially attenuates emission of RF energy. A conductor (44) in electrical contact with the conductive coating (40) couples the conductive coating (40) to a reference potential, such as ground. The conductor (44) may be a metal or conductive silicone strip in electrical contact with the conductive coating (40) along the length of the lamp envelope (22). The discharge lamp (12) may be connected to a ballast circuit (20) by coaxial cables (60,62). The outer conductor (66,70) of each coaxial cable (60,62) is connected to the conductive coating (40) to form a continuous RF shield. The conductive coating (40) and/or the metal strip may be used for heating of the discharge lamp (12).
摘要:
Circuit protection systems which comprise a PTC resistor (1) and a second resistor (6), e.g. a thick film resistor (6), which is thermally and electrically connected to the PTC resistor have a break current IB and a hold current IH such that the ratio IB/IH is at most 20. Suitable PTC resistors (1) are conductive polymer devices which comprise a PTC element (10) which has been radiation crosslinked under conditions such that the average dose rate is at most 3.0 Mrad/minute or during which no part of the PTC element (10) which is in contact with the electrodes (2, 3) reaches a temperature greater than (Tm-60)°C, where Tm is the melting point of the polymeric component of the conductive polymer (10).
摘要:
Screen printing technology is employed in the batch fabrication of the contacts and polymeric membranes of solid-state ion-selective sensors. The process achieves high yield with very reproducible results. Moreover, membrane thickness can easily be predetermined, as it is directly related to the thickness of the screen or stencil. The process of the present invention is compatible with many integrated circuit manufacturing technologies, including CMOS fabrication. Advantageous polymeric membrane paste compositions include a polyurethane/hydroxylated poly(vinyl chloride) compound and a silicone-based compound in appropriate solvent systems to provide screen-printable pastes of the appropriate viscosity and thixotropy.