Porous, membrane-like structures with different supramolecular organisation are prepared from solutions of syndiotactic polystyrene in cyclohexanol. Liquid–liquid (L–L) demixing leads to the formation of amorphous materials. They transform into the helix or g -phase on heating above Tg. Further heating leads to a melting–recrystallisation process that transforms the g -phase into the zigzag or b -phase. This structure formation prevents re-dissolution of the polymer and maintains the demixed state at temperatures far above the Q-temperature of the polymer–solvent system. Elimination of the solvent at different temperatures leads to amorphous porous materials or porous materials with the polymer in the g - or b -phase.
Посилання на статтю:
Phase behaviour and structure formation in the system syndiotactic polystyrene/cyclohexanol / J. De Rudder, H. Berghmans, J. Arnauts // Polymer. – 1999. – N 40. – P. 5919–5928.