Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F16%3A43902346" target="_blank" >RIV/60461373:22340/16:43902346 - isvavai.cz</a>
Result on the web
<a href="http://www.sciencedirect.com/science/article/pii/S0376738816314314" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0376738816314314</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.memsci.2016.08.054" target="_blank" >10.1016/j.memsci.2016.08.054</a>

Result language
angličtina
Original language name
Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation
Original language description
The initially very promising transport properties of glassy high free volume polymers deteriorate rapidly over time. In this work, we focused on this aging phenomenon in two polymers of intrinsic microporosity (PIMs), namely PIM-1 and PIM-EA-TB. To identify the main mechanisms involved, we studied the time declines of permeability and diffusivity of methanol vapours in flat membranes with approximately equal thicknesses. The permeation measurements were carried out using a continuous flow permeation method with carrier gas, where the methanol vapours were held at constant activity 0.2 at 25 degrees C. Two different experimental modes were used: (i) continuous experiments that consisted of one long experiment with a duration of over 650 h for each polymer and (ii) momentary experiments that consisted of a vast number of short (ca. 6 h) consecutive measurements of transient permeation. The observed decreases of methanol permeability due to aging were more intense in the case of continuous mode for both polymers. In other words, the aging was ca. 1.3 times faster in the continuous mode in comparison with the momentary mode. Using time-aging time superposition, we successfully predicted the continuous experiments from the momentary experiments.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CD - Macromolecular chemistry
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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