Next Article in Journal
Next Article in Special Issue
Previous Article in Journal
Polymers 2013, 5(2), 706-729; doi:10.3390/polym5020706
Article

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

1
, 2
, 2
 and 1,*
Received: 25 April 2013; in revised form: 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.
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


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.

AMA 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(2):706-729.

Chicago/Turabian Style

Förster, Nadja; Pöppler, Ann-Christin; Stalke, Dietmar; Vana, Philipp. 2013. "Photocrosslinkable Star Polymers via RAFT-Copolymerizations with N-Ethylacrylate-3,4-dimethylmaleimide." Polymers 5, no. 2: 706-729.


Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert