摘要:
A method for producing a polybutadiene, which comprises subjecting 1,3-butadiene to cis-1,4 polymerization, and subsequently subjecting a resultant in the resulting polymerization system to syndiotactic-1,2 polymerization, the method being characterized in that there is added, after the polymerization, a halogen acid or halogen acid salt.
摘要:
A superconductive non-contact rotary device comprising; a bulk superconductor having a pinning effect arranged in a heat insulating cryogenic vessel, a permanent magnet arranged at one side of the vessel so as to face one surface of the bulk superconductor across a wall, and a permanent magnet arranged at the other side of the vessel facing the other surface of the bulk superconductor across a wall, one permanent magnet being rotated to make the other permanent magnet rotate in a non-contact state.
摘要:
A polyimide film with improved adhesion obtained by forming a thin polybenzimidazole layer on one or both sides of a polyimide film, a process for fabrication of a polyimide film with improved adhesion whereby an organic polar solvent solution containing a polybenzimidazole is coated or sprayed onto one or both sides of a self-supporting film prepared by casting and drying a dope, which is an organic polar solvent solution of a polyimide precursor which may contain an imidization catalyst, onto a support, and the film is then thoroughly heat treated, a cover lay film obtained by laminating a cover lay film adhesive onto the polyimide film with improved adhesion, and a laminated body employing the polyimide film with improved adhesion. The polyimide film exhibits the excellent characteristics of aromatic polyimide films including thermal properties, physical properties and electrical properties, while also having satisfactory adhesion.
摘要:
The electrophoresis apparatus comprises rectifier (A) which rectifies an AC current from a universal AC power source and outputs a rectified wave, an electrophoresis cell and an electric controller which applies an electric output from the rectifier (A) to a carrier disposed in the electrophoresis cell, the elastic controller comprising a controller (3) for indirectly controlling, in accordance with external inputs, a driving section (6) which controls an electric output from the rectifier circuit. The electrophoresis cell unit defines a recess for receiving the electric controller, and a cover is positionable over the electrophoresis cell unit. The cover includes a cover terminal, where the cover and cover terminal are shaped to electrically connect an output terminal of the electric controller to an input terminal of the electrophoresis cell unit when the cell covers the electrophoresis cell unit.
摘要:
The invention is to establish means of producing easily and at low cost “a coupled body of superconducting magnets”, comprised of multi-pole bulk superconducting magnets lined up such that the polarities thereof alternately vary so as to cause a magnetic field gradient to occur. The magnetizing method for producing a coupled body comprised of multi-pole bulk superconducting magnets with respective polarities varying comprises the steps of coupling adjacent members for bulk superconducting magnets of a plurality of members for bulk superconducting magnets with each other in such a way as to be freely superposable, foldable, and unfoldable, superposing all the members for the bulk superconducting magnets on top of one after another, and applying a magnetizing process thereto in as superposed state, and unfolding alternately and juxtaposing the respective bulk superconducting magnets as superposed after the magnetizing process as shown in FIG. 1(A) to FIG. 1(D).
摘要:
Disclosed is a process for producing a conjugated diene polymer having a very high content of cis-1,4 structures by using an yttrium compound-containing catalyst that is relatively easy to handle and has a high activity. Specifically disclosed is a process for producing a conjugated diene polymer containing cis-1,4 structures at a ratio of 99% or higher, which is characterized by polymerizing a conjugated diene in the presence of a catalyst produced from (A) a specific yttrium compound, (B) an ionic compound consisting of a non-coordinating anion and a cation, and (C) an organoaluminum compound.
摘要:
Provided by using a catalyst containing an yttrium compound is conjugated diene polymer with very low solution viscosity, improved workability, high degree of branching, and high content of cis-1,4 structures. Also provided is a rubber composition utilizing the polymer and allowing excellent dispersion of reinforcing agent. According to a method of manufacturing a conjugated diene polymer characterized by polymerizing a conjugated diene at 50 to 120° C. in the presence of a catalyst obtained from (A) an yttrium compound, (B) an ionic compound consisting of a non-coordinating anion and a cation, and (C) an organoaluminum compound, the conjugated diene polymer has the following characteristics that: (1) a ratio (Tcp/ML1+4) between a 5 wt % toluene solution viscosity (Tcp) measured at 25° C. and a Mooney viscosity (ML1+4) at 100° C. is 0.1 to 1.2; and (2) a content of cis-1,4 structures is 80% or higher, and a content of 1,2 structures is lower than 5%.
摘要:
A method of fabrication of an RE-Ba-Cu—O-based oxide superconductor, characterized by using an RE-Ba-O-based compound (RE being one type or two types or more of rare earth elements) and a Ba-Cu-O-based material for liquid phase as a starting material, melting the material for liquid phase, then growing the crystal.
摘要:
In order to provide an inexpensive mechanical persistent current switch with a short operation time and a large capacity without causing energy loss, a mechanical persistent current switch comprises a bulk member which is made of RE—Ba—Cu—O superconductor (RE is a rare earth element), connector material, and the bulk member made of RE—Ba—Cu—O superconductor is made by a melt process in which resin is impregnated, and an current terminal and a voltage terminal pasted onto the bulk member.
摘要:
Modified polybutadiene having a high-cis and low-trans structure with a moderate 1,2-structure content and exhibiting improved characteristics such as cold flow properties, which is obtained by modifying starting polybutadiene having a Tcp/ML1+4 ratio (Tcp: 5% toluene solution viscosity at 25° C.ML1+4: Mooney viscosity at 100° C.) of 2.5 or more in the presence of a transition metal catalyst.