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Issue 10, 2014
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Poly(methacrylic acid)-based AB and ABC block copolymer nano-objects prepared via RAFT alcoholic dispersion polymerization

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Abstract

A series of well-defined amphiphilic poly(methacrylic acid)–poly(benzyl methacrylate) (PMAA–PBzMA) diblock copolymers are synthesized via polymerization-induced self-assembly using an alcoholic dispersion polymerization formulation. Chain growth is mediated via reversible addition–fragmentation chain transfer polymerization (RAFT) chemistry using a trithiocarbonate-based chain transfer agent (CTA) at 70 °C. The poly(methacrylic acid) block is soluble in ethanol and acts as a steric stabilizer for the growing insoluble PBzMA chains, resulting in the in situ generation of diblock copolymer nano-objects in the form of spheres, worms or vesicles, depending on the precise reaction conditions. Copolymer morphologies can be covalently stabilized via cross-linking to prevent their dissociation when transferred into aqueous solution, which leads to the formation of highly anionic nano-objects due to ionization of the PMAA stabilizer chains. ABC triblock copolymer nanoparticles can also be prepared using this approach, where the third block is based on the semi-fluorinated monomer, 2,2,2-trifluoroethyl methacrylate (TFEMA). GPC studies confirm that chain extension is efficient and high TFEMA conversions can be achieved. Microphase separation between the mutually incompatible PBzMA and semi-fluorinated PTFEMA core-forming blocks occurs, producing a range of remarkably complex semi-fluorinated triblock copolymer morphologies.

Graphical abstract: Poly(methacrylic acid)-based AB and ABC block copolymer nano-objects prepared via RAFT alcoholic dispersion polymerization

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Publication details

The article was received on 12 Feb 2014, accepted on 04 Mar 2014 and first published on 06 Mar 2014


Article type: Paper
DOI: 10.1039/C4PY00201F
Author version available: Download Author version (PDF)
Citation: Polym. Chem., 2014,5, 3466-3475
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    Poly(methacrylic acid)-based AB and ABC block copolymer nano-objects prepared via RAFT alcoholic dispersion polymerization

    M. Semsarilar, V. Ladmiral, A. Blanazs and S. P. Armes, Polym. Chem., 2014, 5, 3466
    DOI: 10.1039/C4PY00201F

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