Insights into the Thermal Response of a Poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) Triblock Polymer in Water

被引：1

作者：

Rick, Steven W. ^{[1
]}

机构：

[1] Univ New Orleans, Dept Chem, New Orleans, LA 70148 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2021年 / 125卷 / 08期

关键词：

Block copolymers - Ethylene - Propylene - Hydrogen bonds;

D O I：

10.1021/acs.jpcb.0c11279

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A thermal responsive block copolymer made up of ethylene oxide (EO) and propylene oxide (PO) blocks was simulated with optimized atomistic potentials and enhanced sampling methods over a range of temperatures. The results for the L42 pluronic polymer (EO)(4)(PO)(22)(EO)(4), which is known to undergo a transition in this temperature range, and the similarly sized (EO)(30) polymer, which does not, are compared. The thermal responsive L42 polymers in a dilute solution tend to aggregate, and this tendency gets stronger as temperature increases. The poly(ethylene oxide) polymer shows no such tendency. The aggregation is stabilized by the hydrophobic contact of the propylene oxide methyl groups, which outweighs a small loss in hydrogen bonds between the ether oxygens and water.

引用

页码：2167 / 2173

页数：7