Hyperbranched polymers as scaffolds for multifunctional reversible addition-fragmentation chain-transfer agents: A route to polystyrene-core-polyesters and polystyrene-block-poly(butyl acrylate)-core-polyesters
2003 (English)In: Journal of Polymer Science Part A: Polymer Chemistry, ISSN 0887-624X, E-ISSN 1099-0518, Vol. 41, no 23, 3847-3861 p.Article in journal (Refereed) Published
Polydisperse hyperbranched polyesters were modified for use as novel multifunctional reversible addition-fragmentation chain-transfer (RAFT) agents. The polyester-core-based RAFT agents were subsequently employed to synthesize star polymers of n-butyl acrylate and styrene with low polydispersity (polydispersity index < 1.3) in a living free-radical process. Although the polyester-core-based RAFT agent mediated polymerization of n-butyl acrylate displayed a linear evolution of the number-average molecular weight (M.) up to high monomer conversions (>70%) and molecular weights [M-n > 140,000 g mol(-1), linear poly(methyl methacrylate) equivalents)], the corresponding styrene-based system reached a maximum molecular weight at low conversions (approximate to30%, M-n = 45,500 g mol(-1), linear polystyrene equivalents). The resulting star polymers were subsequently used as platforms for the preparation of star block copolymers of styrene and n-butyl acrylate with a polyester core with low polydispersities (polydispersity index < 1.25). The generated polystyrene-based star polymers were successfully cast into highly regular honeycomb-structured microarrays.
Place, publisher, year, edition, pages
2003. Vol. 41, no 23, 3847-3861 p.
reversible addition-fragmentation chain transfer (RAFT), kinetics (polym.), hyperbranched, dendrimers, honeycomb-structured arrays, living radical polymerization, transfer raft polymerization, diblock copolymers, self-organization, star, styrene, films, homopolymerizations, nanoparticles, retardation
IdentifiersURN: urn:nbn:se:kth:diva-22956DOI: 10.1002/pola.10976ISI: 000186552400015OAI: oai:DiVA.org:kth-22956DiVA: diva2:341654
QC 201005252010-08-102010-08-102010-10-22Bibliographically approved