Solvents intrinsic nonsolvent method

POLYMERIZATION Solvent evacuation (SE) method and intrinsic nonsolvent (INS)... 

The intrinsic nonsolvent (INS) polymerization protocol [34], where solvent is never employed, is a technique that is closely related to the solvent evacuation method. In a typical experiment, neat AlEt3 was dropped into neat Ti(OBu)4 in a Schlenk flask at 0°C. The catalyst was aged for 1 h at room temperature and then further aged for another hour at 150° C. The flask was degassed and rotated to coat its walls with the catalyst solution. The system was then cooled to —78°C and acetylene was added. The reaction was allowed to proceed for 30-60 min before quenching. The resulting PA film was washed with toluene at — 78°C and dried under vacuum. 

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