New polymer syntheses—63. polycondensations of silylated imidazolidone-2 and benzimidazolidone-2

Add time:08/30/2019    Source:sciencedirect.com

N,N-Bistrimethylsilylimidazolidone-2 is significantly more nucleophilic than imidazolidone itself and undergoes polycondensations with dicarboxylic-acid dichlorides in bulk. The resulting poly(N -acylimidazolidone)s are semicrystalline materials, soluble in acidic solvents. Cocondensation with silylated diphenols and activated difluoroaromatics (such as 2,6-difluoropyridine, 4,4′-difluorodiphenylsulphone or 2,6-difluorobenzonitrile) yields modified aromatic polyethers with higher glass-transition temperatures. N,N′-Bistrimethylsilylbenzimidazolidone-2 is not reactive enough to yield high-molecular weight polymers.

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