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Issue 6, 2014
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Supramolecular polymer networks of building blocks prepared via RAFT polymerization

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Abstract

A novel A2B3-type supramolecular polymer network was synthesized using two precision tailored building blocks: doubly-adamantyl end-capped poly(N,N-dimethylacrylamide) and a three-pronged β-cyclodextrin (β-CD) core. The polymers were prepared via reversible addition–fragmentation chain transfer (RAFT) polymerization yielding molecular weights between 4500 and 42 600 g mol−1 and molar mass dispersities between 1.2 and 1.4. The β-CD trilinker was synthesized using a 1,3-cycloaddition of tripropargylamine and β-CD–azide. The supramolecular networks were prepared in aqueous media and the host–guest driven self-assembly of the building blocks was demonstrated via 2D nuclear Overhauser effect spectroscopy (NOESY) and dynamic light scattering (DLS). The rheological behavior of the polymer networks was investigated using steady shear and oscillatory shear measurements. Thereby, the influence of the molecular weight of the adamantyl-functionalized polymers, their concentration in aqueous solution and the ratio of adamantyl and β-CD groups on the viscosity were systematically evaluated. Additionally, the temperature dependence and the disruption of the host–guest interactions by addition of competitive native β-CD and potassium adamantyl carboxylate were exemplarily demonstrated.

Graphical abstract: Supramolecular polymer networks of building blocks prepared via RAFT polymerization

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Publication details

The article was received on 20 Nov 2013, accepted on 10 Dec 2013, published on 11 Dec 2013 and first published online on 11 Dec 2013


Article type: Paper
DOI: 10.1039/C3PY01624B
Citation: Polym. Chem., 2014,5, 2142-2152
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    Supramolecular polymer networks of building blocks prepared via RAFT polymerization

    M. Hetzer, B. V. K. J. Schmidt, C. Barner-Kowollik and H. Ritter, Polym. Chem., 2014, 5, 2142
    DOI: 10.1039/C3PY01624B

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