The present invention relates to a polymer electrolyte and a method for manufacturing same. More specifically, a polymer electrolyte with improved ion conductivity can be produced by adding boron nitride to a solid electrolyte comprising polysiloxane.

A method and apparatus for preparing boron nitride nanotubes (BNNTs) according to an embodiment may ensure mass-production, may increase yield by reducing a production time, and may prepare BNNTs with high purity.

A method and apparatus for preparing boron nitride nanotubes (BNNTs) according to an embodiment may ensure mass-production, may increase yield by reducing a production time, and may prepare BNNTs with high purity.

A reaction method comprising combining a carbonyl-substituted arylboronic acid or ester and an -effect amine in aqueous solution at a temperature between about 5 C to 55 C, and a pH between 2 and 8 to produce an adduct. A process is also provided comprising: contacting a boron compound having a boron atom bonded to a sp.sup.2 hybridized carbon conjugated with a cis-carbonyl, the boron having at least one labile substituent, with an -effect amine, in a solvent for a time sufficient to form an adduct, which may proceed to further products.

Disclosed herein are processes for purifying as-synthesized boron nitride nanotube (BNNT) material to remove impurities of boron, amorphous boron nitride (a-BN), hexagonal boron nitride (h-BN) nanocages, h-BN nanosheets, and carbon-containing compounds. The processes include heating the BNNT materials at different temperatures in the presence of inert gas and a hydrogen feedstock or in the presence of oxygen.

To provide a composition for a three-dimensional integrated circuit capable of forming a filling interlayer excellent in thermal conductivity also in a thickness direction, using agglomerated boron nitride particles excellent in the isotropy of thermal conductivity, disintegration resistance and kneading property with a resin. A composition for a three-dimensional integrated circuit, comprising agglomerated boron nitride particles which have a specific surface area of at least 10 m.sup.2/g, the surface of which is constituted by boron nitride primary particles having an average particle size of at least 0.05 m and at most 1 m, and which are spherical, and a resin (A) having a melt viscosity at 120 C. of at most 100 Pa.Math.s.

Provided is a hexagonal boron nitride powder capable of obtaining a resin composition excellent in solder heat resistance.

The solder heat resistance of the resin composition can be improved by using a hexagonal boron nitride powder having a ratio (S.sub.W/S.sub.N) of a BET specific surface area (S.sub.W) measured using water as an adsorbed species to a BET specific surface area (S.sub.N) measured using nitrogen as an adsorbed species of 0.07 or less. In addition, by a method for producing a hexagonal boron nitride powder, including a step of heat-treating a coarse hexagonal boron nitride powder having an amount of eluted boron of 60 ppm or less at 1300? C. or higher and 2200? C. or lower in a nitrogen atmosphere having a dew point temperature of ?85? C. or lower, a hexagonal boron nitride powder capable of improving the solder heat resistance of the resin composition can be obtained.

A process for producing a material in the form of nanosheets by ball milling of crystals of the material, wherein the ball milling takes place in the presence of a reactive gas.

A process for obtaining borazane (NH.sub.3BH.sub.3) includes introducing anhydrous liquid ammonia (NH.sub.3(l)) into a reactor thermostatically regulated to between a temperature .sub.1 and 40 C.; introducing, with stirring, into the reactor an amine borane complex (Am.BH.sub.3), the corresponding amine (Am) of which is soluble in anhydrous liquid ammonia only to a proportion of less than 10 g in 100 g of ammonia at 20 C., being introduced in an amount such that the mole ratio R=(NH.sub.3(l))/(Am.BH.sub.3) is greater than or equal to 5; stirring the mixture; stopping the stirring to obtain two demixed phases: a light phase constituted essentially of a solution of anhydrous liquid ammonia (NH.sub.3(l)) containing borazane; and a heavy phase constituted essentially of the amine corresponding to the amine borane complex introduced; isolating the borazane and drying under vacuum thereof; the temperature .sub.1 being greater than or equal to the melting point of the amine borane complex.

A method and apparatus for preparing boron nitride nanotubes (BNNTs) according to an embodiment may ensure mass-production, may increase yield by reducing a production time, and may prepare BNNTs with high purity. The method includes steps of providing a first powder including boron, forming a second powder including a boron precursor by nano-sizing the first powder, forming a precursor disk by mixing the second powder with a binder; and growing BNNTs on the precursor disk.