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Full Molecular Weight Distribution in RAFT Polymerization. New Mechanistic Insight by Direct Integration of the Equations

✍ Scribed by Iván Zapata-González; Enrique Saldívar-Guerra; José Ortiz-Cisneros

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
968 KB
Volume
20
Category
Article
ISSN
1022-1344

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✦ Synopsis

Abstract

The full molecular weight distribution (FMWD) equations in RAFT polymerization are solved by direct integration for three models: intermediate radical termination (IRT), slow fragmentation (SF), and IRT with oligomers (IRTO). It is shown that the quasi steady state approximation (QSSA) is always applicable to living radicals, and also applicable to intermediate radicals in the IRT and IRTO models. The application of the QSSA allows for considerable simplification of the numerical solution of the equations. A marked bimodality is found for the FMWD of the SF model only. This suggests model discrimination by radical trapping experiments followed by GPC measurement of the total MWD. magnified image

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✍ Enrique Saldívar-Guerra; Ramiro Infante-Martínez; Eduardo Vivaldo-Lima; Antonio 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 457 KB

## Abstract Direct integration of the equations describing the full MWD in addition polymerization is shown to be feasible in reasonable computing times using standard computers for a considerable number of realistic systems. This is possible if the stiffness of the system is removed (if present) b