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[12:00] Special Chemistry & Materials Science and Technology Joint Seminar
- Description:
- Special Joint Seminar from the Department of Chemistry and the Department of Materials Science and Technology of the University of Crete
"Shinning a light to copper mediated living radical polymerization: Maximizing end-group fidelity"
Dr. Athina Anastasaki
Hawker Research Group California NanoSystems Institute (CNSI),
University of California, Santa Barbara,
Thursday 21/07/2016,
12:00
Chemistry Department Seminar Room
The ability to regulate the activation and deactivation steps via an external stimulus has always been a challenge in polymer chemistry. In an ideal photo-mediated system, whereby high monomer conversion and excellent end group fidelity can be maintained, precise control over the polymer composition and microstructure would be a significant breakthrough. Herein, we report, a versatile, simple and inexpensive method that allows for the synthesis of sequence-controlled multiblock copolymers in a one pot polymerization reaction at ambient temperature. In the absence of a conventional photoredox catalyst and dye-sensitisers, low concentrations of CuBr2 in synergy with Me6-Tren mediate acrylic block copolymerization under UV irradiation (λmax ≈ 360 nm). Four different acrylate monomers were alternated in various combinations within the polymer composition illustrating the potential of the technique. Narrow disperse undecablock copolymers were obtained (Đ < 1.2) with quantitative conversion achieved between the iterative monomer additions. The effect of the chain length was investigated allowing for higher molecular weight multiblock copolymers to be obtained. This approach offers a versatile and inexpensive platform for the preparation of high-order multiblock functional materials with additional applications arising from the precise spatiotemporal “on/off” control and resolution when desired.
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July 2016
