Thermophilic films and fibers from photo cross-linkable UCST-type polymers

Titelangaben

Liu, Fangyao ; Jiang, Shaohua ; Ionov, Leonid ; Agarwal, Seema:
Thermophilic films and fibers from photo cross-linkable UCST-type polymers.
In: Polymer Chemistry. Bd. 6 (2015) Heft 14 . - S. 2769-2776.
ISSN 1759-9954
DOI: https://doi.org/10.1039/c5py00109a

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Abstract

Photo cross-linkable thermoresponsive polymers of UCST-type based on acrylamide (AAm) and acrylonitrile (AN) useful for preparing thermophilic hydrogel films and fibers are presented. The polymers prepared via free radical and reversible addition fragmentation chain-transfer (RAFT) polymerization methods using N-(4-benzoylphenyl) acrylamide (BPAm) as photo cross-linkable comonomers provided highly stable UCST-type phase transition in water reproducible without hysteresis for many cycles. The cloud point could be manipulated by varying the acrylonitrile amount in the feed. Chemically cross- linked hydrogel films and nanofibers (average diameter 500 nm) were successfully prepared from the ter-co-polymers by solution casting and electrospinning followed by UV irradiation. These hydrogels showed a continuous positive volume transition behavior in water with increasing temperature that was utilized for the design of microactuators.