期刊
ADVANCED FUNCTIONAL MATERIALS
卷 22, 期 15, 页码 3116-3127出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201102237
关键词
interpenetrating networks; thiophene; conducting polymers; actuation
类别
资金
- National Research Council
- Defense Threat Reduction Agency, Chemical and Biological Technologies Directorate [BA07PRO013]
An interpenetrating polymer network (IPN) material with controllable nanoporosity is developed for applications such as chemical protection. The IPN material is based on a conducting polymer backbone consisting of thiophene and 3,4 ethylenedioxythiophene (EDOT) repeat unitspoly(thiophene-EDOT)formed within a soft polyurethane support. The IPN demonstrates reversible, electrochemically switchable nanoporosity in the absence of standard liquid electrolyte, with the oxidized state being the open (high porosity) state and the reduced state being the closed (low porosity) state. The switching of the IPN between its oxidized (open) and reduced (closed) states is actuated using application of +/- 1.0 V. The variability in the IPN porosity, induced by the electrochemical switching, is revealed by large changes in water vapor diffusivity, as well as changes in the diffusivities of the chemical agent simulants chloroethyl ethyl sulfide (CEES) and methyl salicylate (MeS). The closed state of the IPN is able to decrease CEES diffusivity by approximate to 99% compared to expanded Teflon (ePTFE), while the open state allows high MVT rates comparable to ePTFE. The IPN's ability to allow high MVT under non-threat conditions (open state) and high protection from agents under threat conditions (closed state) is a unique and desirable characteristic of this novel IPN material.
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