Abstract
The capping of “living” poly(methyl methacrylate) (PMMA) and “living” polystyrene (PS), both prepared by the RAFT technique, with various olefins was screened using 19F-NMR spectroscopy. The capping of “living” PMMA with a labeled stilbene was as high as 63% and with certain cinnamate esters was essentially quantitative, but the capping of “living” polystyrene with all the olefins investigated was generally poor.
Highlights
Introduction of Stilbene Derivatives and CinnamateArticle EsterDerivatives at the ω-EndGroups of Cinnamate
4,4,4-trifluorobutyl labels were used because the fluoro groups were well removed from the olefinic bonds and unlikely to have any significant effect on their reactivity
It will be noted that the shifts fall into three well-resolved regions: δ -53 ppm for the CF3 O– residues of the labeled peroxide (4); δ -104 ppm for the “living” dithiobenzoate fluoro group; near δ -58 ppm for the initiator part of chain transfer agent (CTA) (5) and for all the potential capping olefins
Summary
Introduction of Stilbene Derivatives and CinnamateArticle EsterDerivatives at the ω-EndGroups of Cinnamate. Appropriate end end group group functionalities (i)(i) to to bind thethe polymer via Appropriate functionalitiescould couldpossibly possiblybe beused, used,for forexample, example, bind polymer the end groups to a particular surface [1];. (ii) to provide recognition sites at the polymer chain ends; via the end groups to a particular surface [1]; (ii) to provide recognition sites at the polymer chain (iii) to(iii) fluorescently label label the end of theofpolymer [2]; or[2];. (iv)orto(iv) synthesize polymers with novel ends; to fluorescently thegroups end groups the polymer to synthesize polymers with architectures [3]. Bevington’s research research group group studied studied the the free free radical radical polymerization polymerizationof of
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