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Polymers 2013, 5(2), 706-729; doi:10.3390/polym5020706

Photocrosslinkable Star Polymers via RAFT-Copolymerizations with N-Ethylacrylate-3,4-dimethylmaleimide

1
Institute of Physical Chemistry, Georg-August-University Göttingen, Tammannstr. 6, D-37077 Göttingen, Germany
2
Institute of Inorganic Chemistry, Georg-August-University Göttingen, Tammannstr. 4, D-37077 Göttingen, Germany
*
Author to whom correspondence should be addressed.
Received: 25 April 2013 / Revised: 30 May 2013 / Accepted: 30 May 2013 / Published: 10 June 2013
(This article belongs to the Special Issue Complex Macromolecular Architectures)

Abstract

This paper describes the Z-RAFT-star copolymerization of n-butyl acrylate (BA) and N-isopropyl acrylamide (NIPAm), respectively, with N-ethylacrylate-3,4-dimethylmaleimide (1.1), a monomer carrying a UV-reactive unit that undergoes photocrosslinking. Addition of 1.1 slows down the polymerization rate both for BA and for NIPAm polymerization. Double star formation due to radical attack to the 3,4-dimethylmaleimide moiety was found in the case of BA. Dead polymer formation, presumably due to aminolysis as side-reaction, was pronounced in the NIPAm system. These two effects broadened the molar mass distributions, but did not impede the formation of functional star polymers. The composition of the copolymers as well as the reactivity ratios for the applied comonomers were determined via NMR spectroscopy (BA-co-1.1 r1.1 = 2.24 rBA = 0.95; NIPAm-co-1.1 r1.1 = 0.96 rNIPAm = 0.05). In both cases, the comonomer is consumed preferably in the beginning of the polymerization, thus forming gradient copolymer stars with the UV-reactive units being located in the outer sphere. View Full-Text
Keywords: RAFT polymerization; N-ethylacrylate-3,4-dimethylmaleimide; star polymers; N-isopropyl acrylamide (NIPAm); butyl acrylate (BA); copolymerization; reactivity ratios RAFT polymerization; N-ethylacrylate-3,4-dimethylmaleimide; star polymers; N-isopropyl acrylamide (NIPAm); butyl acrylate (BA); copolymerization; reactivity ratios
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Förster, N.; Pöppler, A.-C.; Stalke, D.; Vana, P. Photocrosslinkable Star Polymers via RAFT-Copolymerizations with N-Ethylacrylate-3,4-dimethylmaleimide. Polymers 2013, 5, 706-729.

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