Investigations on the peculiar permeation properties of volatile organic compounds and permanent gases through PTMSP
Identifieur interne : 001701 ( Main/Exploration ); précédent : 001700; suivant : 001702Investigations on the peculiar permeation properties of volatile organic compounds and permanent gases through PTMSP
Auteurs : V. V. Teplyakov [France] ; D. Roizard ; Éric Favre (génie des procédés) [France] ; V. S. KhotimskySource :
- Journal of Membrane Science [ 0376-7388 ] ; 2003.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
In contrast to common glassy polymers, poly(1-trimethylsilyl-1-propyne) (PTMSP), a high free volume glassy polymer, shows a preferable permeation of large condensable organic vapors in comparison to permanent gases. In order to investigate this phenomenon, a systematic permeability study over a large activity range has been performed on PTMSP with three types of volatile organic compounds (VOCs) as diffusing probes: toluene, dimethylketone and dichloromethane. PTMSP was synthesized with different catalytic systems (Nb or Ta based) able to induce controlled sub-molecular cis-trans structures. Whereas dimethylketone and dichloromethane permeability can be correctly described by a classical dual-mode equation, a peculiar bell shaped pattern was obtained for toluene, with a minimum permeability located at an activity value around a=0.3-0.4. In that case, only a dual-mode expression taking into account a concentration dependent diffusion coefficient can account for the results. On the other hand some apparent conflicting data recorded from PTMSP brand new films were related to the microstructure of the polymer main chain thanks to 13C NMR spectroscopy analysis showing importance of cis- and trans-forms of the main chain of PTMSP. cis-Structure is more flexible and can be responsible for the creation of a higher density physical network (HDN) in polymeric matrix; conversely, trans-structure is more rigid and can provide lower density physical network (LDN). The higher permeability recorded for several probes through PTMSP synthesized with TaCl5/Al(i-Bu)3 catalytic system compared to those of NbCl5 based polymer can be explained by the geometric difference of the macromolecule networks. © 2003 Elsevier B.V. All rights reserved.
Affiliations:
- France
- Grand Est, Lorraine (région)
- Nancy
- Centre national de la recherche scientifique, Laboratoire réactions et génie des procédés, Université de Lorraine
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V." last="Teplyakov">V. V. Teplyakov</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Groupe ENSIC UMR 7568 - Inst. Natl. Polytech. L. LCPM</s1><s2>54001 Nancy</s2><s3>FRA</s3><sZ>1 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Nancy</settlement></placeName></affiliation></author><author><name sortKey="Roizard, D" sort="Roizard, D" uniqKey="Roizard D" first="D." last="Roizard">D. Roizard</name></author><author><name sortKey="Favre, E" sort="Favre, E" uniqKey="Favre E" first="E." last="Favre">Éric Favre (génie des procédés)</name><affiliation><country>France</country><placeName><settlement type="city">Nancy</settlement><region type="region" nuts="2">Grand Est</region><region type="region" nuts="2">Lorraine (région)</region></placeName><orgName type="laboratoire" n="5">Laboratoire réactions et génie des procédés</orgName><orgName type="university">Université de Lorraine</orgName><orgName type="institution">Centre national de la recherche scientifique</orgName></affiliation></author><author><name sortKey="Khotimsky, V S" sort="Khotimsky, V S" uniqKey="Khotimsky V" first="V. S." last="Khotimsky">V. S. Khotimsky</name></author></analytic><series><title level="j" type="main">Journal of Membrane Science</title><title level="j" type="abbreviated">J. Membr. Sci.</title><idno type="ISSN">0376-7388</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of Membrane Science</title><title level="j" type="abbreviated">J. Membr. Sci.</title><idno type="ISSN">0376-7388</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Catalysis</term><term>Experiments</term><term>Gas permeable membranes</term><term>Higher density physical networks (HDN)</term><term>Macromolecules</term><term>Microstructure</term><term>Theory</term><term>Toluene</term><term>Volatile organic compounds</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Théorie</term><term>Composé organique volatil</term><term>Catalyse</term><term>Toluène</term><term>Microstructure</term><term>Macromolécule</term><term>Membrane perméable gaz</term><term>Expérience</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In contrast to common glassy polymers, poly(1-trimethylsilyl-1-propyne) (PTMSP), a high free volume glassy polymer, shows a preferable permeation of large condensable organic vapors in comparison to permanent gases. In order to investigate this phenomenon, a systematic permeability study over a large activity range has been performed on PTMSP with three types of volatile organic compounds (VOCs) as diffusing probes: toluene, dimethylketone and dichloromethane. PTMSP was synthesized with different catalytic systems (Nb or Ta based) able to induce controlled sub-molecular cis-trans structures. Whereas dimethylketone and dichloromethane permeability can be correctly described by a classical dual-mode equation, a peculiar bell shaped pattern was obtained for toluene, with a minimum permeability located at an activity value around a=0.3-0.4. In that case, only a dual-mode expression taking into account a concentration dependent diffusion coefficient can account for the results. On the other hand some apparent conflicting data recorded from PTMSP brand new films were related to the microstructure of the polymer main chain thanks to 13C NMR spectroscopy analysis showing importance of cis- and trans-forms of the main chain of PTMSP. cis-Structure is more flexible and can be responsible for the creation of a higher density physical network (HDN) in polymeric matrix; conversely, trans-structure is more rigid and can provide lower density physical network (LDN). The higher permeability recorded for several probes through PTMSP synthesized with TaCl5/Al(i-Bu)3 catalytic system compared to those of NbCl5 based polymer can be explained by the geometric difference of the macromolecule networks. © 2003 Elsevier B.V. All rights reserved.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Nancy</li></settlement><orgName><li>Centre national de la recherche scientifique</li><li>Laboratoire réactions et génie des procédés</li><li>Université de Lorraine</li></orgName></list><tree><noCountry><name sortKey="Khotimsky, V S" sort="Khotimsky, V S" uniqKey="Khotimsky V" first="V. S." last="Khotimsky">V. S. Khotimsky</name><name sortKey="Roizard, D" sort="Roizard, D" uniqKey="Roizard D" first="D." last="Roizard">D. Roizard</name></noCountry><country name="France"><region name="Grand Est"><name sortKey="Teplyakov, V V" sort="Teplyakov, V V" uniqKey="Teplyakov V" first="V. V." last="Teplyakov">V. V. Teplyakov</name></region><name sortKey="Favre, E" sort="Favre, E" uniqKey="Favre E" first="E." last="Favre">Éric Favre (génie des procédés)</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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