Reaction kinetics of multiphase polymer systems under flow
Identifieur interne : 000680 ( PascalFrancis/Corpus ); précédent : 000679; suivant : 000681Reaction kinetics of multiphase polymer systems under flow
Auteurs : Lian-Fang Feng ; Guo-Hua HuSource :
- AIChE journal [ 0001-1541 ] ; 2004.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
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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NO : | PASCAL 05-0086615 INIST |
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ET : | Reaction kinetics of multiphase polymer systems under flow |
AU : | FENG (Lian-Fang); HU (Guo-Hua) |
AF : | State Key Laboratory of Polymer Reaction Engineering, College of Materials Science and Chemical Engineering, Zhejiang University/Hangzhou/Chine (1 aut.); Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL/Nancy/France (1 aut.); Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, BP 451/54001 Nancy/France (2 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | AIChE journal; ISSN 0001-1541; Coden AICEAC; Etats-Unis; Da. 2004; Vol. 50; No. 10; Pp. 2604-2612; Bibl. 30 ref. |
LA : | Anglais |
EA : | 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. |
CC : | 001D07 |
FD : | Cinétique; Vitesse réaction; Borne supérieure; Mélangeage; Collision; Aire interfaciale; Temps relaxation |
ED : | Kinetics; Reaction rate; Upper bound; Mixing; Collision; Interfacial area; Relaxation time |
SD : | Cinética; Velocidad reacción; Cota superior; Mezclado; Colisión; Superficie interfacial; Tiempo relajación |
LO : | INIST-7678.354000122297390240 |
ID : | 05-0086615 |
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Pascal:05-0086615Le document en format XML
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<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>
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<ET>Reaction kinetics of multiphase polymer systems under flow</ET>
<AU>FENG (Lian-Fang); HU (Guo-Hua)</AU>
<AF>State Key Laboratory of Polymer Reaction Engineering, College of Materials Science and Chemical Engineering, Zhejiang University/Hangzhou/Chine (1 aut.); Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL/Nancy/France (1 aut.); Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, BP 451/54001 Nancy/France (2 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
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<LA>Anglais</LA>
<EA>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.</EA>
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<ED>Kinetics; Reaction rate; Upper bound; Mixing; Collision; Interfacial area; Relaxation time</ED>
<SD>Cinética; Velocidad reacción; Cota superior; Mezclado; Colisión; Superficie interfacial; Tiempo relajación</SD>
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