A technique for preparing Y 1 , Ba 2 Cu 3 O 7‐x /polymer composites showing superconducting resistive transition above liquid‐nitrogen temperature has been developed. A sintered Y 1 Ba 2 Cu 3 O 7‐x disk was impregnated with a low‐viscosity 2‐ethylhexyl acrylate monomer containing benzoyl peroxide and dicumyl peroxide as polymerization catalysts. The impregnation of sintered disks was carried out under moderate vacuum for 30 min followed by an overnight soaking. The polymerization treatment consisted of a heat treatment at 60°C for 24 h followed by a second heat treatment at 80°C for 8 to 10 h. The superconductorlpo1ymer specimens exhibited superconducting resistive transition at ≃80 K. The scanning electron micrograph reveals excellent welting, infiltration, and polymerization of the monomer into the superconducting material.
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Sarkar et al. (1989) studied this question.