High‐molecular‐weight symmetrical multiblock copolymers: Synthesis by RAFT polymerization and characterization
作者： Kyriaki S. Pafiti , Costas S. Patrickios , Clarissa Abetz , Volker Abetz
DOI: 10.1002/POLA.26936
关键词:
摘要: High-molecular-weight (MW) symmetrical multiblock copolymers, based on the hydrophobic monomers styrene (Sty) and methyl methacrylate (MMA), more polar monomer, 2-vinyl pyridine (2VPy), were prepared using stepwise reversible addition-fragmentation chain transfer polymerization. All copolymers shared a common poly(ethylene glycol) (PEG) midblock, introduced as bifunctional macromolecular agent. In total, five ABA triblock ABCBA pentablock terpolymers, two ABCDCBA heptablock quaterpolymers (comprising four different monomer types) synthesized. The MWs of polymers determined gel permeation chromatography (GPC) proton nuclear magnetic resonance (1H NMR) spectroscopy, with latter values being closer to theoretically expected, whereas GPC MW distributions relatively narrow, broadening number blocks. compositions synthesized polymers, by 1H NMR also close expected values. Finally, films cast from chloroform solutions terpolymers P2VPy-b-PSty-b-PEG-b-PSty-b-P2VPy, PSty-b-PMMA-b-PEG-b-PMMA-b-PSty, P2VPy-b-PMMA-b-PEG-b-PMMA-b-P2VPy examined transmission electron microscopy exhibited PSty PMMA cylinders (first two) lamellae (third terpolymer). © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Chem. 2013, 51, 4957–4965
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