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Preparation of hydrophobically modified associating multiblock copolymers via a one-pot aqueous RAFT polymerization

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Abstract

We describe an efficient strategy for the preparation of hydrophobically associating multiblock copolymers using the RAFT technique. Polymerization reactions were carried out by a one-pot aqueous RAFT polymerization at 70 °C using a symmetrical trithiocarbonate as a chain transfer agent (CTA) in aqueous media. The macroRAFT polyacrylamide (PAM) was synthetized and chain extended by polymerization of N,N′-dihexylacrylamide (DHAM) and acrylamide (AM), respectively. The resultant polymers were intensely characterized by size exclusion chromatography (SEC), nuclear magnetic resonance (NMR) spectroscopy, diffusion-ordered spectroscopy (DOSY), Fourier transform-infrared (FT-IR) spectroscopy and rheology. The structure and insertion of a hydrophobic block (PDHAM) into the backbone were carefully demonstrated. The rheological measurements confirmed the effect of the hydrophobic block number on the viscosity of polymers at different concentrations and the formation of a reversible physical network of entangled polymers in aqueous media. Moreover, the incorporation of the hydrophobic block (PDHAM) was established by the oscillatory measurement.

Graphical abstract: Preparation of hydrophobically modified associating multiblock copolymers via a one-pot aqueous RAFT polymerization

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Publication details

The article was received on 29 Aug 2019, accepted on 23 Sep 2019 and first published on 24 Sep 2019


Article type: Communication
DOI: 10.1039/C9PY01311C
Polym. Chem., 2019, Advance Article

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    Preparation of hydrophobically modified associating multiblock copolymers via a one-pot aqueous RAFT polymerization

    C. St Thomas, C. N. Muñoz López, E. J. Jiménez Regalado, M. A. de Jesús Tellez, G. Festag, U. S. Schubert and C. Guerrero-Sánchez, Polym. Chem., 2019, Advance Article , DOI: 10.1039/C9PY01311C

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