Reaction kinetics of multiphase polymer systems under flow
Identifieur interne : 001843 ( Main/Merge ); précédent : 001842; suivant : 001844Reaction kinetics of multiphase polymer systems under flow
Auteurs : Lian-Fang Feng [République populaire de Chine, France] ; Guo-Hua Hu [France]Source :
- AIChE journal [ 0001-1541 ] ; 2004.
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- Pascal (Inist)
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Abstract
For given nominal molar concentrations in complementary functional groups, the common wisdom is that the reaction rate of those attached to large molecules does not exceed that of small molecule analogues. They are at best equal. The difference in reaction kinetics is more pronounced if reactive molecules are so large that they phase-separate, which is often so for polymers. In such cases, complementary functional groups from the two phases can meet and react only at the interfaces. Thus, reaction kinetics of functional groups attached to small molecules has always been taken as the upper bound for those attached to polymers. Here we show that under sufficient mixing, reaction kinetics of two immiscible reactive polymers can be significantly higher than that of small molecule analogues. This phenomenon is attributed to the combined effects of increasing collision probability originated from mixing-induced interfacial area generation, longer relaxation time of reactive polymer chains, and eventually interfacial slip.
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Est</region><region type="old region">Lorraine (région)</region><settlement type="city">Nancy</settlement></placeName></affiliation></author><author><name sortKey="Hu, Guo Hua" sort="Hu, Guo Hua" uniqKey="Hu G" first="Guo-Hua" last="Hu">Guo-Hua Hu</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, BP 451</s1><s2>54001 Nancy</s2><s3>FRA</s3><sZ>2 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><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 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wicri:level="4"><inist:fA14 i1="01"><s1>State Key Laboratory of Polymer Reaction Engineering, College of Materials Science and Chemical Engineering, Zhejiang University</s1><s2>Hangzhou</s2><s3>CHN</s3><sZ>1 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Hangzhou</settlement><region type="province">Zhejiang</region></placeName><orgName type="university">Université de Zhejiang</orgName></affiliation><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL</s1><s2>Nancy</s2><s3>FRA</s3><sZ>1 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Grand Est</region><region type="old region">Lorraine (région)</region><settlement type="city">Nancy</settlement></placeName></affiliation></author><author><name sortKey="Hu, Guo Hua" sort="Hu, Guo Hua" uniqKey="Hu G" first="Guo-Hua" last="Hu">Guo-Hua Hu</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, BP 451</s1><s2>54001 Nancy</s2><s3>FRA</s3><sZ>2 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><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></analytic><series><title level="j" type="main">AIChE journal</title><title level="j" type="abbreviated">AIChE j.</title><idno type="ISSN">0001-1541</idno><imprint><date when="2004">2004</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">AIChE journal</title><title level="j" type="abbreviated">AIChE j.</title><idno type="ISSN">0001-1541</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Collision</term><term>Interfacial area</term><term>Kinetics</term><term>Mixing</term><term>Reaction rate</term><term>Relaxation time</term><term>Upper bound</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Cinétique</term><term>Vitesse réaction</term><term>Borne supérieure</term><term>Mélangeage</term><term>Collision</term><term>Aire interfaciale</term><term>Temps relaxation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">For given nominal molar concentrations in complementary functional groups, the common wisdom is that the reaction rate of those attached to large molecules does not exceed that of small molecule analogues. They are at best equal. The difference in reaction kinetics is more pronounced if reactive molecules are so large that they phase-separate, which is often so for polymers. In such cases, complementary functional groups from the two phases can meet and react only at the interfaces. Thus, reaction kinetics of functional groups attached to small molecules has always been taken as the upper bound for those attached to polymers. Here we show that under sufficient mixing, reaction kinetics of two immiscible reactive polymers can be significantly higher than that of small molecule analogues. This phenomenon is attributed to the combined effects of increasing collision probability originated from mixing-induced interfacial area generation, longer relaxation time of reactive polymer chains, and eventually interfacial slip.</div></front></TEI><affiliations><list><country><li>France</li><li>République populaire de Chine</li></country><region><li>Grand Est</li><li>Lorraine (région)</li><li>Zhejiang</li></region><settlement><li>Hangzhou</li><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><li>Université de Zhejiang</li></orgName></list><tree><country name="République populaire de Chine"><region name="Zhejiang"><name sortKey="Feng, Lian Fang" sort="Feng, Lian Fang" uniqKey="Feng L" first="Lian-Fang" last="Feng">Lian-Fang Feng</name></region></country><country name="France"><region name="Grand Est"><name sortKey="Feng, Lian Fang" sort="Feng, Lian Fang" uniqKey="Feng L" first="Lian-Fang" last="Feng">Lian-Fang Feng</name></region><name sortKey="Hu, Guo Hua" sort="Hu, Guo Hua" uniqKey="Hu G" first="Guo-Hua" last="Hu">Guo-Hua Hu</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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