Assessing the importance of diffusion-controlled effects on polymerization rate and molecular weight development in nitroxide-mediated radical polymerization of styrene

dc.creatorRoa-Luna, M
dc.creatorDiaz-Barber, MP
dc.creatorVivaldo-Lima, E
dc.creatorLona, LMF
dc.creatorMcmanus, NT
dc.creatorPenlidis, A
dc.date2007
dc.dateFEB
dc.date2014-11-16T19:04:45Z
dc.date2015-11-26T16:24:51Z
dc.date2014-11-16T19:04:45Z
dc.date2015-11-26T16:24:51Z
dc.date.accessioned2018-03-28T23:05:41Z
dc.date.available2018-03-28T23:05:41Z
dc.identifierJournal Of Macromolecular Science Part A-pure And Applied Chemistry. Taylor & Francis Inc, v. 44, n. 2, n. 193, n. 203, 2007.
dc.identifier1060-1325
dc.identifierWOS:000243542100010
dc.identifier10.1080/10601320601031366
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/54960
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/54960
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/54960
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1268501
dc.descriptionA previously derived kinetic model for the nitroxide-mediated radical polymerization (NMRP) of styrene has been modified by considering diffusion-controlled (DC) effects on the bimolecular radical termination, monomer propagation, dormant polymer activation, and polymer radical deactivation reactions. Free-volume theory was used to incorporate the DC-effects into the model. It was found that DC-termination enhances the living behavior of the system, whereas DC-propagation, DC-activation and DC-deactivation worsen it. Although the inclusion of overall DC-effects into the kinetic model improved the performance of the model by slightly reducing the deviations obtained from experimental data of polymerization rate and molecular weight in the bimolecular NMRP of styrene with 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) and dibenzoyl peroxide (BPO), it does not seem to justify adding the extra four free-volume parameters. In the case of the semi-batch addition of azo-bis-iso-butyronitrile (AIBN) (several single shots at definite time intervals) in the NMRP of styrene, recently reported in the literature, it was found that DC effects are more significant, but it was observed that there was a strong dependence of polymerization rate on the frequency of addition of the shots of initiator (a maximum on polymerization rate being observed at a given frequency of addition of the shots), which could not be adequately explained in terms of DC-effects.
dc.description44
dc.description2
dc.description193
dc.description203
dc.languageen
dc.publisherTaylor & Francis Inc
dc.publisherPhiladelphia
dc.publisherEUA
dc.relationJournal Of Macromolecular Science Part A-pure And Applied Chemistry
dc.relationJ. Macromol. Sci. Part A-Pure Appl. Chem.
dc.rightsfechado
dc.rightshttp://journalauthors.tandf.co.uk/permissions/reusingOwnWork.asp
dc.sourceWeb of Science
dc.subjectliving radical polymerization
dc.subjectcontrolled radical polymerization
dc.subjectpolystyrene
dc.subjectmathematical modeling
dc.subjectdiffusion-controlled effects
dc.subjectTEMPO
dc.subjectKinetics
dc.subjectSimulation
dc.subjectInitiator
dc.subjectModels
dc.subjectTempo
dc.titleAssessing the importance of diffusion-controlled effects on polymerization rate and molecular weight development in nitroxide-mediated radical polymerization of styrene
dc.typeArtículos de revistas


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