Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Membrane Science

ISSN

0376-7388

e-ISSN

—

Svazek periodika

520

Číslo periodika v rámci svazku

neuveden

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

895-906

Kód UT WoS článku

000384785000088

EID výsledku v databázi Scopus

2-s2.0-84984849131