We have found that 2-methyl oxazoline and methyl maleate can be spontaneously copolymerized at room temperature without added initiators. The copolymerization was found to proceed through a zwitterionic mechanism. The zwitterionic intermediate has been isolated and characterized by elemental analysis, 1H n.m.r., 13C n.m.r., and CH, CH2, CH 3 13C n.m.r, subspectra with the distortionless enhancement by polarization transfer (DEPT) technique, and i.r. spectroscopy. It was also found that the polymer structure derived from the polymerization of the zwitterionic salt was essentially identical to that of the material resulting from the direct polymerization of 2-methyl oxazoline and methyl maleate.
Посилання на статтю:
Isolation of zwitterionic intermediates in the spontaneous copolymerization of 2-methyl oxazoline and methyl maleate / Kang I. Lee* and Myong-Hoon Lee // Polymer. – 1993. – Vol 34. – P. 650-654.