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Titolo: Modeling termination kinetics of nonstationary freeradical polymerizations
Autore: Buback, M; BarnerKowollik, C; Egorov, M; Kaminsky, V;
 Indirizzi:
 LY Karpov Phys Chem Res Inst, Moscow 103064, Russia LY Karpov Phys Chem Res Inst Moscow Russia 103064 Moscow 103064, Russia Univ Gottingen, Inst Chem Phys, D37077 Gottingen, Germany Univ GottingenGottingen Germany D37077 hys, D37077 Gottingen, Germany
 Titolo Testata:
 MACROMOLECULAR THEORY AND SIMULATIONS
fascicolo: 4,
volume: 10,
anno: 2001,
pagine: 209  218
 SICI:
 10221344(20010516)10:4<209:MTKONF>2.0.ZU;24
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 LENGTH DEPENDENT TERMINATION; CONTROLLED VINYL POLYMERIZATION; DIFFUSIONCONTROLLED PROCESSES; PULSEDLASER POLYMERIZATION; RATE COEFFICIENT; METHYLMETHACRYLATE; MOLECULARWEIGHT; RATECONSTANT; PROPAGATION; SYSTEMS;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Physical, Chemical & Earth Sciences
 Citazioni:
 30
 Recensione:
 Indirizzi per estratti:
 Indirizzo: Buback, M LY Karpov Phys Chem Res Inst, Ul Vorontsovo Pole 10, Moscow 103064, Russia LY Karpov Phys Chem Res Inst Ul Vorontsovo Pole 10 Moscow Russia 103064



 Citazione:
 M. Buback et al., "Modeling termination kinetics of nonstationary freeradical polymerizations", MACROMOL TH, 10(4), 2001, pp. 209218
Abstract
Pulsedlaser induced polymerization is modeled via an approach presented in a previous paper.([1]) An equation for the time dependence of freeradical concentration is derived. It is shown that the termination rate coefficient may vary significantly as a function of time after applying the laser pulse despite of the fact that the change in monomer concentration during oneexperiment is negligible. For the limiting case of t >> c(1) (k(p)M)(1),where c is it dimensionless chaintransfer constant, k(p) the propagation rate coefficient and M the monomer concentration an analytical an analytical expression for k(t) is derived. It is also shown that timeresolved single pulselaser polymerization (SPPLP) experiments can yield the parameters that allow the modeling of k(t) in quasistationary polymerization. The influence of inhibitors is also considered. The conditions are analyzed under which M(t) curves recorded at different extents of laserinduced photoinitiator decomposition intersect. It is shown that such type of behavior is associated with a chainlength dependence of k(t).
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Documento generato il 05/04/20 alle ore 12:13:26