摘要:
A method for making a carbon nanotube composite structure is provided. First, a matrix having a surface and a carbon nanotube structure are provided. The carbon nanotube structure is placed on the surface of the matrix. The carbon nanotube structure includes a plurality of carbon nanotubes. The carbon nanotube structure and the matrix are exposed to electromagnetic waves.
摘要:
A carbon nanotube composite structure includes a matrix and a carbon nanotube structure. The matrix has a surface. The carbon nanotube structure is incorporated in the matrix. A distance between the carbon nanotube structure and the surface is less than 10 micrometers. The carbon nanotube structure includes a plurality of carbon nanotubes joined with each other by van der Waals attractive force.
摘要:
Disclosed herein is a golf ball having improved cut and shear resistance. Such gold balls comprise a core, an inner cover layer, and an outer cover layer, the outer cover layer being formed from a polyurea or poly(urea-co-urethane) comprising: 1) a polyurea prepolymer comprising: the reaction product of at least one first polyisocyanate, wherein the polyisocyanate has a reactivity greater than that of 4,4′-methylene bis(cyclohexyl) isocyanate and a functionality of 1.7 to 2.3, and at least one amine-terminated compound, wherein the amine-terminated compound is selected from the group consisting of amine-terminated hydrocarbons, amine-terminated polyethers, amine-terminated polyesters, amine-terminated polycaprolactones, amine-terminated polycarbonates, amine-terminated polyamides, and mixtures thereof; and at least one second polyisocyanate with a vapor pressure lower than 0.01 mm Hg at 20° C.; and 2) at least one curing agent comprising amine or hydroxyl functional curatives.
摘要:
A polyurethane elastomer is provided. The elastomer is the reaction product of at least a prepolymer and a chain extender, where the prepolymer is the reaction product of at least one polyol and at least one aliphatic diisocyanate. The chain extender is at least one of a diol or a non-aromatic diamine.
摘要:
The present invention relates to cast polyurethane elastomers of high resilience, clarity, and attractive abrasion resistance derived from polyurethane systems comprising a customized selection of polycaprolactone polyol incorporated into the isocyanate and/or isocyanate-reactive composition.
摘要:
Emitters, compositions, and processes and methods for making emitters and compositions, useful for emitting sample for mass spectral analysis and/or acting as a stationary phase in chromatographic applications are described. Compositions according to the invention can comprise particles entrapped by polymer such that unoccluded channels are formed and the particles are substantially uncovered and able to interact with sample.
摘要:
Prepolymers having active NCO groups are disclosed. The prepolymers are the reaction product of at least one polyisocyanate and a polyhydric component which comprises at least one dimer fatty derivative diol or diamine that is a natural oil based polyol or polyamine which includes the derivative of at least one dimer fatty acid. Polyurethane and polyurea elastomer obtained from the prepolymers are also disclosed. Also disclosed are methods of manufacturing polyurethane or polyurea treaded tires.
摘要:
A thermoset polyurethane composition having excellent impact and optical properties is prepared from a formulation comprising at least a prepolymer and a chain extender. The prepolymer includes an isocyanate component, containing 1,3-bis(isocyanatomethyl)cyclohexane and at least (20) percent by weight of 1,4-bis(isocyanatomethyl)cyclohexane, and an isocyanate-reactive component, containing hydroxyl, amine or thiol functionality. The isocyanate-reactive component includes from (70) to (95) percent by weight of a compound having a molecular weight from 150 to less than 950 Daltons, and from (5) to (30) percent by weight of a compound having a molecular weight from 2,000 to 4,500 Daltons. The chain extender is an aromatic, aliphatic, or cycloaliphatic polyamine compound containing at least one hydroxyl and/or thiol group. Articles that may be prepared include ophthalmic lenses, vehicle glazings, aircraft canopies, and the like.
摘要:
The invention is directed to polyurethane prepolymers having a reduced amount of unreacted monomeric diisocyanate, particularly diphenylmethane diisocyanate (MDI), prepared by distilling the prepolymer reaction product in the presence of at least one inert solvent whose boiling point is slightly below that of the monomeric diisocyanate; and to high performance cast polyurethane elastomers from the thus obtained prepolymers using diamine and/or diol chain extenders.
摘要:
The present invention discloses a low voltage battery protector, interposed between a battery and a cable connected thereto, including: a main body having an upper end, a lower end substantially opposite to the upper end, and a frame connecting the upper end to the lower end. The frame further includes a mounting surface. The protector incudes a first contact extending from the top end; a supporting portion extending substantially perpendicularly from the mounting surface; a second contact assembled with the supporting portion. The second contact includes a connecting portion pivotally assembled with the supporting portion. Such a low voltage battery protector provides the user with great flexibility and convenience to choose an adaptive position to mount the protector, and provides the user with more space to mount the protector.