Abstract:
A method for producing a film which comprises an aromatic amide oxadiazole polymer containing an oxadiazole structure, the method comprising: immersing a film containing a carbohydrazide structure in a dehydration-cyclization agent solution bath at room temperature to produce a compound having an oxadiazole structure by dehydration-cyclization of the carbohydrazide structure, wherein the dehydration-cyclization agent solution consists of a base and solvent; and heat treating the film at a temperature 200°C to 500°C for several seconds to several minutes.
Abstract:
An alicyclic or aromatic polyamide exhibiting a percent transmission of 80 % or above in the wavelength region of 450 to 700nm is produced by using an aramid polymer comprising specific structural units in an amount of 50 mole% or above. Colorless transparent alicyclic or aromatic polyamide films having high rigidity and high heat resistance are provided by using the polyamide. Further, the invention provides various optical members made by using the polyamide or the polyamide films, and polyamide copolymers.
Abstract:
A method for producing an aromatic polymer containing aromatic polyamide structural units and aromatic carbohydrazide structural units at a specific ratio is disclosed. A film having a high Young's modulus, high elongation at break and low moisture absorption can be formed from such an aromatic polymer. Dehydration cyclization of a compound having a carbohydrazide structure can be conducted under mild conditions at low cost by causing the chemical reaction using a chemical which is selected from the acids and bases.
Abstract:
An aromatic polymer containing aromatic polyamide structural units and aromatic carbohydrazide structural units at a specific ratio is disclosed. A film having a high Young's modulus, high elongation at break and low moisture absorption can be formed from such an aromatic polymer. Dehydration cyclization of a compound having a carbohydrazide structure can be conducted under mild conditions at low cost by causing the chemical reaction using a chemical which is selected from the acids and bases.
Abstract:
An aromatic polymer containing aromatic polyamide structural units and aromatic carbohydrazide structural units at a specific ratio is disclosed. A film having a high Young's modulus, high elongation at break and low moistur e absorption rate can be formed from such an aromatic polymer. Dehydration cyclization of a compound having a carbohydrazide structure can be conducted under mild conditions at low cost by causing the chemical reaction using a chemical which is selected from the acids and bases.
Abstract:
An alicyclic or aromatic polyamide exhibiting a percent transmission of 80 % or above in the wavelength region of 450 to 700nm is produced by using an aramid polymer comprising specific structural units in an amount of 50 mole% or above. Colorless transparent alicyclic or aromatic polyamide films having high rigidity and high heat resistance are provided by using the polyamide. Further, the invention provides various optical members made by using the polyamide or the polyamide films, and polyamide copolymers.
Abstract:
An aromatic polymer containing aromatic polyamide structural units and aromatic carbohydrazide structural units at a specific ratio is disclosed. A film having a high Young's modulus, high elongation at break and low moisture absorption rate can be formed from such an aromatic polymer. Dehydration cyclization of a compound having a carbohydrazide structure can be conducted under mild conditions at low cost by causing the chemical reaction using a chemical which is selected from the acids and bases.