Use of a non-solvent. After the polymer is dissolved in an appropriate organic solvent, phase separation may be induced in a number of ways. For example a second organic solvent which is miscible with the solvent for the polymer, but at the same time is a non-solvent for the polymer may be added. The solubility of the polymer is now decreased and separates under appropriate conditions as a polymer-rich phase which is also able to surround the core. The polymer-rich phase may be hardened by further treatment with the miscible non-solvent (Luzzi, 1976).
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