Impacts of polymer-polymer interactions and interfaces on the structure and conductivity of PEG-containing polyimides doped with ionic liquid

被引：11
作者：
Coletta, E. [1 ]
Toney, M. Y. [2 ]
Frank, C. W. [1 ]
机构：
[1] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA
[2] Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA
来源：
POLYMER | 2014年 / 55卷 / 26期
关键词：
Polymer electrolyte membrane; Polymer interfaces; Ionic liquid; GAS SEPARATION PROPERTIES; POLY(ETHYLENE OXIDE) SEGMENTS; MOLECULAR-WEIGHT; POLY(AMIC ACID); ALTERNATE COPOLYMERS; LITHIUM BATTERIES; PHASE SEGREGATION; BLOCK-COPOLYMERS; ETHYLENE-OXIDE; CARBON-DIOXIDE;
D O I：
10.1016/j.polymer.2014.10.075
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Polymer electrolyte membrane (PEM) fuel cells can provide alternatively sourced energy, but current PEMs lose performance under certain conditions. The current work examines composition, structure and properties of poly (ethylene glycol)-aromatic polyimide-ionic liquid systems for PEM applications, as poly (ethylene glycol) (PEG) is an ion conductor and polyimides are stable. To evaluate polymer interactions, different PEG concentrations (0-50% by weight) and different PEG molecular weights (990-6000 g/mole) were examined. Characterization techniques included Fourier transform infrared spectroscopy, thermal gravimetric analysis, differential scanning calorimetry, small-angle x-ray scattering, electrochemical impedance spectroscopy and cyclic voltammetry. By increasing the PEG amount, PEG domains and polymer flexibility are increased, which increases conductivity by two to three orders of magnitude. By increasing PEG molecular weight, PEG segmental motion and PEG-polyimide interface quality are decreased, which decreases conductivity by a factor of two. The maximum conductivity was 64 mS/cm at 80 degrees C and 70 %RH. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：6883 / 6895
页数：13
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