Microwave-Assisted Nitroxide-Mediated Radical Polymerization of Acrylamide in Aqueous Solution
Résumé
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 phosphonylated nitroxide (SG1). The microwave enhancement of the polymerization was found to depend on the mode of irradiation, i.e., either a DYN mode or an 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 re-initiation of the polyacrylamide macroinitiator even after 100% of conversion.
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