FIELD: chemistry.
SUBSTANCE: present invention relates to a method of producing optically transparent polyimides of general formula:
where A = 
, 
, 
B = 
, 
.
Method involves high-temperature polycyclisation of equimolar amounts of diamine and dianhydride in a mixture of solvents containing sulpholane, at which reaction mass is heated for 1 hour and held at final temperature, wherein the reaction mass is heated from 20 to 140 °C at rate of 2 degrees per minute in a mixture of solvents containing 80 vol.% sulpholane and 20 vol.% toluene, and held at 140 °C for 1-9 hours with azeotropic distillation of water.
EFFECT: method provides reduced time and temperature of reaction, as well as increased values of reduced viscosity of polyimides.
1 cl, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING OPTICALLY TRANSPARENT POLYIMIDES | 2023 |
|
RU2825872C1 |
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