期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 33, 期 1, 页码 80-86出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201100618
关键词
kinetics; microwave irradiation; radical (co)polymerization; reactivity of monomers; thermal effects
资金
- National Science Foundation [CHE-10-26060]
- CRP Consortium at Carnegie Mellon University
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1026060] Funding Source: National Science Foundation
Critical evaluations of the microwave effect on initiation, propagation, and termination during conventional radical polymerizations (RPs) of methyl methacrylate (MMA) and random copolymerization of styrene (St) with (meth)acrylates are examined by comparing microwave heating (MWH) and conventional heating (CH). Poly(methyl methacrylate) with similar $ \overline M_{\rm n} $, $ \overline M_{\rm w} $/$ \overline M_{\rm n} $, and conversion are obtained under precisely controlled temperature, indicating very small changes of propagation rate constant. Rate enhancement in the absence of precise temperature control is mostly due to the higher reaction temperature of the reaction mixture than the apparent value indicated on display. Rates of initiator decomposition under well-controlled temperature are essentially the same for MWH and CH.
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