Microwave-assisted nitroxide-mediated radical polymerization of acrylamide in aqueous solution
2009
Rigolini, Julien | Grassl, Bruno | Billon, Laurent | Reynaud, Stéphanie | Donard, Olivier F.X.
The present work describes a combination of microwave irradiation as a heating source and water as a solvent for carrying out a living/controlled polymerization of acrylamide. Reasonable results were obtained for a nitroxide-mediated radical polymerization (NMP) with a combination of a conventional hydrosoluble radical initiator and a β-phosphonylated nitroxide. The microwave enhancement of the polymerization was found to depend on the mode of irradiation, i.e., either a dynamic (DYN) mode or an pulse (SPS) mode. The former mode corresponded to a dynamic control of the temperature by way of a high initial microwave power, and in this case, no specific microwave effect was observed. On the other hand, in the SPS mode, which is a pulsed power mode, the result showed a strong acceleration of the polymerization process (>50 times) without the loss of the living/controlled polymerization characteristics, which is relevant with a reinitiation of the polyacrylamide macroinitiator even after 100% of conversion.
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