Investigation of the Living Cationic Ring-Opening Polymerization of 2-Methyl-, 2-Ethyl-, 2-Nonyl-, and 2-Phenyl-2-oxazoline in a Single-Mode Microwave Reactor
The living cationic ring-opening polymerizations of 2-methyl-, 2-ethyl-, 2-nonyl-, and 2-phenyl-2-oxazoline were performed in acetonitrile at high temperatures of up to 200 °C in a single-mode microwave reactor. Upon enhancing the reaction rates by factors of up to 400 in the range from 80 to 200 °C...
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Veröffentlicht in: | Macromolecules 2005-06, Vol.38 (12), p.5025-5034 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The living cationic ring-opening polymerizations of 2-methyl-, 2-ethyl-, 2-nonyl-, and 2-phenyl-2-oxazoline were performed in acetonitrile at high temperatures of up to 200 °C in a single-mode microwave reactor. Upon enhancing the reaction rates by factors of up to 400 in the range from 80 to 200 °C, the first-order kinetics of the monomer consumption and the livingness of the polymerization were maintained. As a consequence of the fast, direct, and noncontact heating by the microwave irradiation, the polymerizations could be carried out in highly concentrated solutions or even from bulk conditions, yielding well-defined polymers (PDI < 1.20). Under the conditions applied in this study, a maximum number of 300 monomers (100 in the case of 2-methyl- and 2-nonyl-2-oxazoline) could be incorporated into the polymer chains under the premise that the average molecular weight distributions remained narrow (PDI < 1.20). |
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ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma0474170 |