Gel Formation in Aqueous Suspension Nitroxide-Mediated Radical Co-Polymerization of Styrene/Divinylbenzene

Results from an experimental study concerning gel formation with nitroxide‐mediated radical polymerization (NMRP) of styrene (S) and divinylbenzene (DVB) in aqueous suspension are reported. Influence of certain polymerization parameters on the dynamics of network formation was measured, namely the p...

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Bibliographic Details
Published in:Macromolecular reaction engineering 2013-04, Vol.7 (3-4), p.155-175
Main Authors: Gonçalves, Miguel A. D., Pinto, Virgínia D., Dias, Rolando C. S., Costa, Mário Rui P. F. N., Aguiar, Leandro G., Giudici, Reinaldo
Format: Article
Language:English
Subjects:
crosslinking
gels
light scattering
living polymerizations
Polymerization
polymerization kinetics
Polymers
Proteins
Styrene
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Summary:Results from an experimental study concerning gel formation with nitroxide‐mediated radical polymerization (NMRP) of styrene (S) and divinylbenzene (DVB) in aqueous suspension are reported. Influence of certain polymerization parameters on the dynamics of network formation was measured, namely the polymerization temperature and initial composition. Soluble polymer formed at different polymerization times was analyzed by size exclusion chromatography (SEC) with refractive index (RI) and multi angle laser light scattering (MALLS) detection. Concentration of pendant double bonds (PDB) was quantified by means of ICl titration and the morphology of the S/DVB particles was inspected by SEM. Incidence of cyclizations was assessed and the improvement of network homogeneity when using NMRP/FRP is discussed. Nitroxide‐mediated radical polymerization (NMRP) synthesis of styrene/divinylbenzene (S/DVB) networks is carried out in aqueous suspension. The effect of temperature (up to 130 °C), dilution, DVB content, and polymerization mechanism (NMRP/FRP) on the dynamics of gelation is measured. Products are characterized by size exclusion chromatography with refractive index and multi angle laser light scattering detection and polymer particles by SEM. Incidence of cyclizations is assessed.
ISSN:1862-832X
1862-8338
DOI:10.1002/mren.201200058