Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 12, Pages 5737-5745Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16197d
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Funding
- NSFC [20734004, 20974125, 51173209]
- Science Foundation of Guangdong Province [8251027501000018]
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Well-defined polyethylene-block-poly(N-isopropylacrylamide) (PE-b-PNIPAM) and polyethylene-block-poly(N-isopropylacrylamide)-block-poly(2-vinylpyridine) (PE-b-PNIPAM-b-P2VP) were successfully synthesized by a combination of coordination chain transfer polymerization (CCTP) with reversible addition-fragmentation chain transfer (RAFT) polymerization in a living/controlled manner. Hydroxyl-terminated polyethylene (PE-OH) was firstly prepared by in situ oxidation of polymer produced by CCTP with bis(imino)pyridine iron/MAO/ZnEt2 catalytic system. After an esterification of PE-OH with S-1-dodecyl-S'-(alpha,alpha'-dimethyl-alpha ''-acetate) trithiocarbonate, trithiocarbonate-terminated polyethylene (PE-trithiocarbonate) was obtained in high yield and used as a macromolecular chain transfer agent (macro-CTA) for RAFT polymerizations of NIPAM and 2VP. The results confirm that the tandem polymerization is an effective approach for synthesizing polyolefin-based amphiphiles. The amphiphilic block copolymers in aqueous solution can self-assemble into a nanodisk-like micelle containing a thin crystalline PE lamella domain between layers of the hydrophilic blocks. Dynamic light scattering (DLS) analyses demonstrated the thermo-responsive property of diblock copolymer PE-b-PNIPAM and double thermo-and pH-responsive properties of triblock copolymer PE-b-PNIPAM-b-P2VP.
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