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Topological Changes in Telechelic Micelles: Flowers versus Stars

  • Dades identificatives

    Identificador: imarina:9243733
    Autors:
    Baulin, Vladimir A.
    Resum:
    The micellization and morphology of spherical telechelic micelles formed by triblock copolymers with short solvophobic end blocks at low concentrations are discussed within scaling arguments and Single Chain Mean Field Theory (SCMFT). In an ultradilute regime, individual telechelic polymer chains can exist in solution in two distinct states: an open linear chain conformation with two free ends and a closed loop conformation in which two ends are connected by the effective attraction between two solvophobic ends. At concentrations below the gelation point, closed loops tend to form micelles comprised mostly of loops in flower-like micelles, while linear polymers in open conformations tend to form star-shaped aggregates with one hydrophobic dangling end. The resulting two kinds of micelles have remarkably different topologies and dimensions, while the transition between them can be driven by the entropy, namely conformation changes between domination of the looped and linear conformations. The transition between two types of micelles lies in a narrow interaction parameters range. Thus, these topological micelles are very sensitive to the changes in the external environment, and they can serve as very sensitive stimuli responsive smart materials.
  • Altres:

    Autor segons l'article: Baulin, Vladimir A.;
    Departament: Química Física i Inorgànica
    Autor/s de la URV: Baulin, Vladimir
    Paraules clau: Thermodynamics Polymers Chain organization Bilayers thermodynamics polymers bilayers
    Resum: The micellization and morphology of spherical telechelic micelles formed by triblock copolymers with short solvophobic end blocks at low concentrations are discussed within scaling arguments and Single Chain Mean Field Theory (SCMFT). In an ultradilute regime, individual telechelic polymer chains can exist in solution in two distinct states: an open linear chain conformation with two free ends and a closed loop conformation in which two ends are connected by the effective attraction between two solvophobic ends. At concentrations below the gelation point, closed loops tend to form micelles comprised mostly of loops in flower-like micelles, while linear polymers in open conformations tend to form star-shaped aggregates with one hydrophobic dangling end. The resulting two kinds of micelles have remarkably different topologies and dimensions, while the transition between them can be driven by the entropy, namely conformation changes between domination of the looped and linear conformations. The transition between two types of micelles lies in a narrow interaction parameters range. Thus, these topological micelles are very sensitive to the changes in the external environment, and they can serve as very sensitive stimuli responsive smart materials.
    Àrees temàtiques: Química Polymers and plastics Polymer science Organic chemistry Medicina veterinaria Materials chemistry Materiais Interdisciplinar Inorganic chemistry Farmacia Engenharias iii Engenharias ii Ciências biológicas i Biotecnología Astronomia / física
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    Adreça de correu electrònic de l'autor: vladimir.baulin@urv.cat
    Identificador de l'autor: 0000-0003-2086-4271
    Data d'alta del registre: 2024-09-07
    Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
    Enllaç font original: https://pubs.acs.org/doi/10.1021/acs.macromol.1c02395
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referència a l'article segons font original: Macromolecules. 55 (2): 517-522
    Referència de l'ítem segons les normes APA: Baulin, Vladimir A.; (2022). Topological Changes in Telechelic Micelles: Flowers versus Stars. Macromolecules, 55(2), 517-522. DOI: 10.1021/acs.macromol.1c02395
    DOI de l'article: 10.1021/acs.macromol.1c02395
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2022
    Tipus de publicació: Journal Publications
  • Paraules clau:

    Inorganic Chemistry,Materials Chemistry,Organic Chemistry,Polymer Science,Polymers and Plastics
    Thermodynamics
    Polymers
    Chain organization
    Bilayers
    thermodynamics
    polymers
    bilayers
    Química
    Polymers and plastics
    Polymer science
    Organic chemistry
    Medicina veterinaria
    Materials chemistry
    Materiais
    Interdisciplinar
    Inorganic chemistry
    Farmacia
    Engenharias iii
    Engenharias ii
    Ciências biológicas i
    Biotecnología
    Astronomia / física
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