Synthesis and properties of 2,2,6,6-tetramethyl-1-(1-phenethyloxy)piperidine,an initiator for living free radical styrene polymerization |
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| Authors: | B A Howell D B Priddy I Q Li P B Smith P E Kastl |
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| Affiliation: | (1) Center for Applications in Polymer Science, Central Michigan University, 48859 Mt. Pleasant, MI, USA;(2) Designed Thermoplastics Research, Dow Chemical Company, 48667 Midland, MI, USA |
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| Abstract: | Summary An initiator for living free radical polymerization may be prepared by trapping the benzylic ethylbenzene radical with the stable 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO) radical. The adduct, 2,2,6,6-tetramethyl-1-(1-phenethyloxy)piperidine (TMPEP), smoothly undergoes thermal fragmentation at temperatures approaching 140° C to afford an active carbon radical capable of initiating polymerization and a passive mediating nitroxyl radical to reversibly cap and preserve the propagating polymer chain. |
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