TY - JOUR
T1 - Star-Shaped Block Copolymers
T2 - Effective Polymer Gelators of High-Performance Gel Electrolytes for Electrochemical Devices
AU - Hwang, Heedong
AU - Park, So Yeong
AU - Kim, Jin Kon
AU - Kim, Yong Min
AU - Moon, Hong Chul
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/1/30
Y1 - 2019/1/30
N2 - Ion gels composed of copolymers and ionic liquids (ILs) have attracted great interest as polymer gel electrolytes for various electrochemical applications. Here, we present highly robust ion gels based on a six-arm star-shaped block copolymer of (poly(methyl methacrylate)-b-polystyrene)6 ((MS)6) and an ionic liquid of 1-ethyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imide ([EMI][TFSI]). Compared to typical ion gels based on linear polystyrene-b-poly(methyl methacrylate)-b-polystyrene (SMS), the (MS)6-based gels show mechanical moduli of more than twice under various strains (e.g., stretching, compression, and shear). In addition, the outstanding mechanical property is maintained even up to 180 °C without a gel-sol transition. To demonstrate that (MS)6-based ion gels can serve as effective gel electrolytes for electrochemical applications, tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)3 2+), a representative electrochemiluminescent (ECL) luminophore, is incorporated into the gels. In particular, flexible ECL devices based on (MS)6 gels exhibit high durability against bending deformation compared to devices with gels based on linear SMS having a similar molecular weight and a composition. This result implies that star-shaped block copolymers are effective gelators for achieving flexible/wearable electrochemical electronics.
AB - Ion gels composed of copolymers and ionic liquids (ILs) have attracted great interest as polymer gel electrolytes for various electrochemical applications. Here, we present highly robust ion gels based on a six-arm star-shaped block copolymer of (poly(methyl methacrylate)-b-polystyrene)6 ((MS)6) and an ionic liquid of 1-ethyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imide ([EMI][TFSI]). Compared to typical ion gels based on linear polystyrene-b-poly(methyl methacrylate)-b-polystyrene (SMS), the (MS)6-based gels show mechanical moduli of more than twice under various strains (e.g., stretching, compression, and shear). In addition, the outstanding mechanical property is maintained even up to 180 °C without a gel-sol transition. To demonstrate that (MS)6-based ion gels can serve as effective gel electrolytes for electrochemical applications, tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)3 2+), a representative electrochemiluminescent (ECL) luminophore, is incorporated into the gels. In particular, flexible ECL devices based on (MS)6 gels exhibit high durability against bending deformation compared to devices with gels based on linear SMS having a similar molecular weight and a composition. This result implies that star-shaped block copolymers are effective gelators for achieving flexible/wearable electrochemical electronics.
KW - block copolymers
KW - electrochemical displays
KW - flexible electronics
KW - ion gels
KW - polymer gel electrolytes
UR - http://www.scopus.com/inward/record.url?scp=85060216785&partnerID=8YFLogxK
U2 - 10.1021/acsami.8b20004
DO - 10.1021/acsami.8b20004
M3 - Article
C2 - 30624039
AN - SCOPUS:85060216785
SN - 1944-8244
VL - 11
SP - 4399
EP - 4407
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 4
ER -