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Prepn. of homogeneous blends of thermodynamically immiscible polymers - by expanding single-phase soln. of polymers in supercritical fluid through fine nozzle, removing fluid and precipitating solid polymer
Prepn. of homogeneous blends of thermodynamically immiscible polymers - by expanding single-phase soln. of polymers in supercritical fluid through fine nozzle, removing fluid and precipitating solid polymer
The prepn. of a homogeneous blend of otherwise thermodynamically immiscible polymers inc. at least one block or graft copolymer, comprises rapidly expanding a heated single-phase soln. of the polymers in a supercritical fluid solvent across a small diameter nozzle, whereby the supercritical fluid is removed and the solid polymer blend is pptd. at a temp. of no more than 30 [deg]C above the Tg of the polymer blend, and the non-equilibrium homogeneous morphology of the blend is maintained. Also claimed is a homogeneous blend of polymers prepd. by the above process.
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