TY - JOUR
T1 - Imidazolium-Containing ABA Triblock Copolymers as Electroactive Devices
AU - Margaretta, Evan
AU - Fahs, Gregory B.
AU - Inglefield, David L.
AU - Jangu, Chainika
AU - Wang, Dong
AU - Heflin, James R.
AU - Moore, Robert B.
AU - Long, Timothy Edward
PY - 2016/1/20
Y1 - 2016/1/20
N2 - Two-step reversible addition-fragmentation chain transfer (RAFT) polymerization and two subsequent postpolymerization modification steps afforded well-defined ABA triblock copolymers featuring mechanically reinforcing polystyrene outer blocks and 1-methylimidazole-neutralized poly(acrylic acid)-based central blocks. Size exclusion chromatography and 1H NMR spectroscopy confirmed predictable molecular weights and narrow distributions. The ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIm][OTf]) was incorporated at 30 wt % into polymeric films. Thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis determined the thermomechanical properties of the polymers and polymer-IL composites. Atomic force microscopy, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM) determined surface and bulk morphologies, and poly(Sty-b-AA(MeIm)-b-Sty) exhibited a change from packed cylindrical to lamellar morphology in SAXS upon IL incorporation. Electrochemical impedance spectroscopy determined the in-plane ionic conductivities of the polymer-IL membranes (μ 10-4 S/cm). A device fabricated from poly(Sty-b-AA(MeIm)-b-Sty) with 30 wt % incorporated IL demonstrated mechanical actuation under a low applied voltage of 4 V.
AB - Two-step reversible addition-fragmentation chain transfer (RAFT) polymerization and two subsequent postpolymerization modification steps afforded well-defined ABA triblock copolymers featuring mechanically reinforcing polystyrene outer blocks and 1-methylimidazole-neutralized poly(acrylic acid)-based central blocks. Size exclusion chromatography and 1H NMR spectroscopy confirmed predictable molecular weights and narrow distributions. The ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIm][OTf]) was incorporated at 30 wt % into polymeric films. Thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis determined the thermomechanical properties of the polymers and polymer-IL composites. Atomic force microscopy, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM) determined surface and bulk morphologies, and poly(Sty-b-AA(MeIm)-b-Sty) exhibited a change from packed cylindrical to lamellar morphology in SAXS upon IL incorporation. Electrochemical impedance spectroscopy determined the in-plane ionic conductivities of the polymer-IL membranes (μ 10-4 S/cm). A device fabricated from poly(Sty-b-AA(MeIm)-b-Sty) with 30 wt % incorporated IL demonstrated mechanical actuation under a low applied voltage of 4 V.
KW - block copolymers
KW - controlled polymerization
KW - electromechanical actuators
KW - ionic liquids
KW - self-assembly
UR - http://www.scopus.com/inward/record.url?scp=84955323381&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84955323381&partnerID=8YFLogxK
U2 - 10.1021/acsami.5b09965
DO - 10.1021/acsami.5b09965
M3 - Article
AN - SCOPUS:84955323381
SN - 1944-8244
VL - 8
SP - 1280
EP - 1288
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 2
ER -