High-temperature polyimide coating for optical fibres

We present our first results on the fabrication of new, high-performance polyimide coatings. The key components of the coatings are polyimides containing various cardo and/or fluoroalkylene groups, which allows the coatings to retain their high-temperature stability and facilitates the storage of the starting polymer and the optical fibre coating process owing to the good solubility of such copolymers in many organic solvents. Annealing for and at temperatures of 430, 350 and , respectively, reduces the strength of optical fibres having such coating by no more than 10 %.