1 research outputs found
UV Light and Temperature Responsive Supramolecular ABA Triblock Copolymers via Reversible Cyclodextrin Complexation
A novel triblock macromolecular architecture based on
cyclodextrin
(CD) complexation is presented. A CD-functionalized biocompatible
poly(<i>N</i>-(2-hydroxypropyl)methacrylamide) (PHPMA) building
block (3800 ≤ <i>M</i><sub>n</sub> ≤ 10 600
g mol<sup>–1</sup>; 1.29 ≤ <i>Đ</i><sub>M</sub> ≤ 1.46) and doubly guest-containing poly(<i>N</i>,<i>N</i>-dimethylacrylamide) (PDMAAm) (6400 ≤ <i>M</i><sub>n</sub> ≤ 15 700 g mol<sup>–1</sup>; 1.06 ≤ <i>Đ</i><sub>M</sub> ≤ 1.15)
and poly(<i>N</i>,<i>N</i>-diethylacrylamide)
(PDEAAm) (5400 ≤ <i>M</i><sub>n</sub> ≤ 12 100
g mol<sup>–1</sup>; 1.11 ≤ <i>Đ</i><sub>M</sub> ≤ 1.33) segments were prepared via reversible addition–fragmentation
chain transfer (RAFT) polymerization and subsequently utilized for
the formation of a well-defined supramolecular ABA triblock copolymer.
The block formation was evidenced via dynamic light scattering (DLS),
nuclear Overhauser effect spectroscopy (NOESY), and turbidity measurements.
Furthermore, the connection of the blocks was proven to be temperature
responsive andin the case of azobenzene guestsresponsive
to the irradiation with UV light. The application of these stimuli
leads to the disassembly of the triblock copolymer, which was shown
to be reversible. In the case of PDEAAm containing triblock copolymers,
the temperature-induced aggregation was investigated as well