Heller William T, Do Changwoo
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
ACS Omega. 2022 Jun 1;7(23):19474-19483. doi: 10.1021/acsomega.2c01166. eCollection 2022 Jun 14.
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 ([CCmim][Cl]) and 1-butyl-3-methylpyrrolidinium chloride ([CCpyrr][Cl]), on the temperature-dependent self-assembly of (EO)-(PO)-(EO), also known as L62 Pluronic, in aqueous solution. Both ionic liquids depress the temperatures of the various structural transitions that take place, but ([CCpyrr][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.
关于三嵌段聚（环氧乙烷）-聚（环氧丙烷）-聚（环氧乙烷）共聚物在水溶液中的自组装，已有许多研究。这些聚合物随嵌段长度、浓度、温度和添加剂的变化呈现出丰富的相图。在此，我们展示了一项小角中子散射研究，该研究考察了两种与水混溶的离子液体，1-丁基-3-甲基咪唑鎓氯化物（[CCmim][Cl]）和1-丁基-3-甲基吡咯烷鎓氯化物（[CCpyrr][Cl]），对（EO）-（PO）-（EO）（也称为L62普朗尼克）在水溶液中随温度变化的自组装的影响。两种离子液体都降低了发生的各种结构转变的温度，但（[CCpyrr][Cl]）的效果更强。三嵌段共聚物自组装形成的结构没有显著变化，相对于各种转变温度，它们也没有显著改变体系随温度转变所经历的一系列结构。
