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  End-coupling reactions in incompatible polymer blends: From droplets to complex micelles through interfacial instability

Berezkin, A. V., & Kudryavtsev, Y. V. (2013). End-coupling reactions in incompatible polymer blends: From droplets to complex micelles through interfacial instability. Macromolecules, 46(12), 5080-5089. doi:10.1021/ma400700n.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-D83D-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-D83E-7
Genre: Journal Article

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 Creators:
Berezkin, Anatoly Viktorovich1, Author              
Kudryavtsev, Yaroslav V.2, Author              
Affiliations:
1Atomistic Modelling, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863350              
2Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, Moscow, Russia, ou_persistent22              

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Free keywords: Barrier properties; Copolymer compositions; Crew-cut micelles; Dissipative particle dynamics; Droplet instability; Instability development; Interfacial instability; Internal structure, Copolymers; Drops; Emulsification; Morphology; Polymer melts; Reaction kinetics; Surface reactions, Micelles
 Abstract: Simulations by dissipative particle dynamics revealed a possibility to produce micelles of diverse morphologies via irreversible end-coupling reaction in polymer melts containing a particulate phase. It is demonstrated that the reaction at the surface of a polymer A droplet immersed in a melt of polymer B leads to the droplet instability and subsequent micelle formation. Depending on the length ratio of reacting chains and its own size, the droplet is either emulsified into a set of small micelles or converted into a single micelle, which can have rather complex internal structure. A morphology diagram containing structures that are typical for polymer solutions, in particular vesicles, bowls, worms, star-like and crew-cut micelles with multiple internal domains, is first presented for polymer melts. Investigation of the reaction kinetics reveals subsequent linear, saturation, and exponential autoacceleration regimes. By simulations and using simple scaling arguments, it is explained how the barrier properties of a diblock copolymer layer formed at the A/B interface depend on the copolymer composition and droplet curvature. It is found that the scenario of the instability development is much different for flat and spherical A/B interfaces. © 2013 American Chemical Society.

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Language(s): eng - English
 Dates: 2013-06-25
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1021/ma400700n
BibTex Citekey: Berezkin20135080
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Title: Macromolecules
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 46 (12) Sequence Number: - Start / End Page: 5080 - 5089 Identifier: ISSN: 0024-9297
CoNE: https://pure.mpg.de/cone/journals/resource/954925421108