C-13- and H-1-NMR analysis of a nitrile rubber with and without glycidylmethacrylate grating

Glycidyl methacrylate (GMA) grafted and ungrafted nitrile rubbers (NBR) wer e studied by means of C-13 nuclear magnetic resonance spectroscopy (NMR), d istortionless enhancement by polarisation transfer technique and H-1-NMR. T he composition of the NBR rubber and the GMA grafting degree were determine d by quantitative H-1-NMR. Different approaches are discussed to overcome t he encountered difficulties that characteristic reference signals, required for the internal standardization, are affected by the GMA grafting. The GM A grafting degree in the NBR rubber was 5.0 wt.%. The epoxide rings did not open during the grafting of GMA. (C) 2001 Elsevier Science Ltd. AII rights reserved.