Open AccessImpact of Two Water-Miscible Ionic Liquids on the Temperature-Dependent Self-Assembly of the (EO)6–(PO)34–(EO)6 Block Copolymer
Author(s) -
William T. Heller,
Changwoo Do
Publication year - 2022
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.2c01166
Subject(s) - ethylene oxide , copolymer , ionic liquid , aqueous solution , propylene oxide , materials science , polymer chemistry , phase diagram , polymer , chloride , micelle , small angle x ray scattering , oxide , ionic bonding , chemical engineering , chemistry , phase (matter) , scattering , organic chemistry , ion , catalysis , physics , engineering , optics , composite material , metallurgy
There are many studies on the self-assembly of triblock poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) copolymers in aqueous solution. These polymers display a rich phase diagram as a function of block length, concentration, temperature, and additives. Here, we present a small-angle neutron scattering study of the impact of two water-miscible ionic liquids, 1-butyl-3-methylimidazolium chloride ([C 4 C 1 mim][Cl]) and 1-butyl-3-methylpyrrolidinium chloride ([C 4 C 1 pyrr][Cl]), on the temperature-dependent self-assembly of (EO) 6 -(PO) 34 -(EO) 6 , also known as L62 Pluronic, in aqueous solution. Both ionic liquids depress the temperatures of the various structural transitions that take place, but ([C 4 C 1 pyrr][Cl]) has a stronger effect. The structures that the triblock copolymer self-assembles into do not dramatically change nor do they significantly change the series of structures that the system transitions through as a function of temperature relative to the various transition temperatures.