FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing copolyimides which can be used in many high-tech industries, primarily as heat-resistant dielectrics. Method of producing optically transparent copolyimides of general formula
where A = 
, 
, 
, 
, Alyc = 
, 
, 
, 
, 
, 
, Aryl = 
, 
, m = 20÷80, n = 80÷20, by high-temperature polycyclisation of alicyclic diamine, aromatic diamine and dianhydride in a mixture of solvents containing 1,2-dichlorobenzene and sulpholane. Reaction mass is heated for 1 hour and held at final temperature, wherein alicyclic diamine, aromatic diamine and dianhydride are taken in molar ratios of 0.2–0.8:0.8–0.2:1, respectively, reaction mass is heated from 20 to 140 °C at rate of 2 degrees per minute in a mixture of solvents containing 60% vol. 1,2-dichlorobenzene, 20% vol. sulpholane and 20% vol. toluene, and held at 140 °C for 7–23 hours with azeotropic distillation of water.
EFFECT: proposed approach enables to reduce reaction time and temperature, as well as increase value of reduced viscosity of copolyimides.
1 cl, 1 tbl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING OPTICALLY TRANSPARENT COPOLYIMIDES | 2023 |
|
RU2826013C1 |
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|
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|
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|
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| 1-(4'-AMINOPHENYL)-3-AMINOETHYLADAMANTANE - MONOMER FOR SYNTHESIS OF POLYIMIDES AND COPOLYIMIDES WITH ENHANCED HYDROLYTIC RESISTANCE | 1994 |
|
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