摘要:
Stereo-regular polymers are produced by forming a moving stream of gaseous monomer having an electric dipole moment, irradiating the monomer with monochromatic light of a wavelength suitable for activating it, and orientating the activated monomer in an electric field. The activated, orientated monomer then polymerizes to form a stereo-regular polymer.Alternatively, a monomer of the general formula ##STR1## can be used, where at least one of the R groups, the resonating R group, forms an electric dipole moment with the remainder of the monomer. The monomer is then irradiated with a monochromatic light beam having a frequency which resonates with a harmonic frequency resulting from the bond between the resonating R group and the remainder of the monomer. Activation of that particular bond on that particular type of monomer results in a stereo-regular polymer.For best results, however, the two methods are combined.
摘要:
Stereo-regular polymers are produced by forming a moving stream of gaseous monomer having an electric dipole moment, irradiating the monomer with monochromatic light of a wavelength suitable for activating it, and orientating the activated monomer in an electric field. The activated, oriented monomer then polymerizes to form a stereo-regular polymer.Alternatively, a monomer of the general formula ##STR1## can be used, where at least one of the R groups, the resonating R group, forms an electric dipole moment with the remainder of the monomer. The monomer is then irradiated with a monochromatic light beam having a frequency which resonates with a harmonic frequency resulting from the bond between the resonating R group and the remainder of the monomer. Activation of that particular bond on that particular type of monomer results in a stereo-regular polymer.For best results, however, the two methods are combined.
摘要:
A composition is disclosed of a cyanoethylated compound, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats, the cyanoethylated compound in the coating forms particles in the gas stream which are detected by a monitor.
摘要:
A method of coating a copper substrate comprises the steps of: anodically microsmoothing the copper substrate in an acid bath to provide a substantially smooth surface; electrocoating the microsmoothed substrate with a pin hole free nickel film having a thickness of between about 2.5 microns to about 12.5 microns; single step, non-aqueous electrocoating the microsmoothed, nickel coated substrate with a pin hole free polyamic acid polymer, and curing the polyamic acid coating to form a polyimide film free of copper ion contamination.
摘要:
A composition is disclosed of malonic acid, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a fluid stream. The solvent in the composition is evaporated to produce a thermo-particulating coating. When the electrical apparatus overheats the malonic acid in the coating forms particles in the fluid stream which are detected by a monitor.
摘要:
An on-line apparatus and method of using particulography as a technique for detecting and locating overheated material such as insulation within a gas-cooled dynamoelectric machine is disclosed. This technique detects the presence of and identifies the origin of thermoparticulates in a gas stream which are produced by thermal degradation of materials. The gas cooling system is continuously monitored by a gas stream monitor and upon the detection of thermoparticulates in the gas stream, the gas stream is diverted through a particulate collection chamber for entrapment of a sample of the thermoparticulates. The sample is then isolated from the gas cooling system and a flow of clean gas is forced through the sample while the collection chamber is heated at a predetermined rate. Heating the collection chamber will cause reparticulation of the thermoparticulates which are carried to a gas stream monitor located downstream by the flowing gas. The gas stream monitor will monitor the gas and will produce a signal that is proportional to the intensity of the thermoparticulates entrapped in the flowing gas stream. The signal from the gas stream monitor is applied to one axis of a recording device and a signal that is proportional to the temperature of the collection chamber is applied to the other axis producing a particulograph. A particulograph is unique to each kind of material that is present within the machine due to the unique thermoparticulation temperature of each material. Thus, by knowing where different types of materials are located within the machine, the location that is overheated can be identified.
摘要:
A composition is disclosed of a malonic acid derivative, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the malonic acid derivative in the coating forms particles in the gas stream which are detected by a monitor.
摘要:
The occurrence of excessively high temperatures in areas of a generator exposed to a cooling gas stream is visually indicated by passing a portion of the gas stream through an indicator device which comprises a filter holder containing a gas-permeable, particulate-collecting filter on which is an indicator which produces a visual effect when contacted by particulates. A valve controls the flow of the gas to the device and is opened by a monitor when the monitor detects particulates in the gas stream.
摘要:
A thermoparticulating tape is disclosed which comprises a flexible fibrous material, a compound which thermoparticulates at a temperature below 200.degree.C dispersed throughout the flexible fibrous material, and a flexible outer coating over the flexible fibrous material through which the products formed when the compound thermoparticulates can pass. The tape is best made by dissolving the thermoparticulating compound in a solvent, immersing the fibrous material in the solution, evaporating the solvent, and applying the outer coating to the fibrous material. An adhesive backing can be applied to the tape if desired. The tape is placed in an electrical apparatus cooled by a gas stream, in a position exposed to the gas stream. When overheating occurs the tape darkens and emits particles into the gas stream which are detected by a monitor.
摘要:
A composition is disclosed of a solution of a resinous carrier and at least two compounds which thermoparticulate at different temperatures between 60.degree. and 200.degree. C. A coating is made by applying the composition to a portion of an electrical apparatus exposed to a gas stream. As the temperature of the coating increases the compound therein thermoparticulate. The time between which the compounds thermoparticulate indicates the rate of rise of the temperature and analysis of the products of thermoparticulation indicates the location of the coating in the electrical apparatus. Alternatively, the coating can consist of several layers with a thermoparticulating compound in each layer which thermoparticulates at different temperatures.