Reaction kinetics of multiphase polymer systems under flow
Identifieur interne : 001566 ( Main/Exploration ); précédent : 001565; suivant : 001567Reaction 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 ] ; 2004-10.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Polymère.
English descriptors
- KwdEn :
- Aiche, Aiche journal october, Alcohol system, Analogue, Carboxylic acids, Collision, Collision frequency, Common wisdom, Complementary, Copolymer, Copolymer chains, Early stage, Functional groups, Graft, Graft copolymer, Graft copolymers, Heterogeneous, Immiscible, Immiscible polymers, Interaction parameter, Interface, Interfacial, Interfacial area, Interfacial area generation, Interfacial coverage, Interfacial regions, Inversed, Inversed graft copolymer, Isocyanate groups, Kinetics, Lamellar spacing, Miscible, Miscible system, Mixing, Moiety, Molar, Molar mass, Molecular size, Molecule alcohol, Nominal molar concentrations, October, Open symbols, Overall reaction rate, Phys, Pmma, Pmma phase, Polymer, Polymer blends, Polymer chains, Reaction kinetics, Reaction rate, Reactive, Reactive blend, Reactive polymer, Reactive polymer chains, Reactive polymers, Relaxation time, Rotation speed, Sebacoyl chloride, Small molecule analogues, Time dependency, Trunk chain, Upper bound.
- Teeft :
- Aiche, Aiche journal october, Alcohol system, Analogue, Carboxylic acids, Collision frequency, Common wisdom, Complementary, Copolymer, Copolymer chains, Early stage, Functional groups, Graft, Graft copolymer, Graft copolymers, Heterogeneous, Immiscible, Immiscible polymers, Interaction parameter, Interface, Interfacial, Interfacial area, Interfacial area generation, Interfacial coverage, Interfacial regions, Inversed, Inversed graft copolymer, Isocyanate groups, Kinetics, Lamellar spacing, Miscible, Miscible system, Moiety, Molar, Molar mass, Molecular size, Molecule alcohol, Nominal molar concentrations, October, Open symbols, Overall reaction rate, Phys, Pmma, Pmma phase, Polymer, Polymer blends, Polymer chains, Reaction kinetics, Reaction rate, Reactive, Reactive blend, Reactive polymer, Reactive polymer chains, Reactive polymers, Rotation speed, Sebacoyl chloride, Small molecule analogues, Time dependency, Trunk chain.
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. © 2004 American Institute of Chemical Engineers AIChE J, 50:2604–2612, 2004
Url:
DOI: 10.1002/aic.10253
Affiliations:
- France, République populaire de Chine
- Grand Est, Lorraine (région), Zhejiang
- Hangzhou, Nancy
- Centre national de la recherche scientifique, Laboratoire réactions et génie des procédés, Université de Lorraine, Université de Zhejiang
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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. © 2004 American Institute of Chemical Engineers AIChE J, 50:2604–2612, 2004</div>
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