Emulsion polymerization of styrene with Iso-octyl-3-mercaptopropionate as chain transfer agent

Four batch and unseeded emulsion polymerizations of styrene were investigated, which included isooctyl 3-mercaptopropionate (iOMP) as chain transfer agent (CTA). This compound was analyzed by ¹³C NMR and GC/MS, resulting in a mixture of over 10 isomers. Because of different reactivities of the CTA i...

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Bibliographic Details
Published in:Journal of applied polymer science 2008-09, Vol.109 (6), p.3944-3952
Main Authors: Minari, R.J, Vega, J.R, González-Sierra, M, Meira, G.R, Gugliotta, L.M
Format: Article
Language:English
Subjects:
Applied sciences
chain transfer agent
emulsion polymerization
Exact sciences and technology
isooctyl 3-mercaptopropionate
molecular weight distribution
Organic polymers
Physicochemistry of polymers
Polymerization
polystyrene
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:Four batch and unseeded emulsion polymerizations of styrene were investigated, which included isooctyl 3-mercaptopropionate (iOMP) as chain transfer agent (CTA). This compound was analyzed by ¹³C NMR and GC/MS, resulting in a mixture of over 10 isomers. Because of different reactivities of the CTA isomers, the produced polystyrenes presented broad and bimodal molecular weight distributions (MWDs). A mathematical model was adjusted to the measurements, and the measured MWDs were adequately predicted when assuming the CTA as a binary mixture of high but different reactivities.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.28490