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Ponencias en congresos:
Mechanisms of diffusion in associating polymer networks
Año:2017
Áreas de investigación
  • Macromoléculas y polímeros
Datos
Descripción
Understanding the mechanisms of motion and relaxation of associating polymers at the molecular level is fundamental for applications such as self-healing materials, enhanced oil-recovery or drug delivery. In unentangled associating polymers, the strength and rates of association/dissociation of the reversible physical crosslinks govern the dynamics of the network and all macroscopic properties, like self-diffusion and rheology. Recently, by means of forced Rayleigh scattering (FRS) experiments, we have proved that associating polymers of different architectures show three regimes of molecular diffusion, including a regime with super-diffusive scaling. Here we propose a new molecular model for unentangled associating polymers that considers the effect of concentration, molecular weight, number of associating groups and strength and rate constants of association/dissociation. By means of simulations and scaling arguments, we show that the model predicts super-diffusive behavior at FRS grating distances much larger than the molecular radius of gyration, in qualitative agreement with the results observed in experiments. This apparent super-diffusion regime can be attributed to a combination of different molecular diffusion modes which continuously exchange between each other due to the association/dissociation kinetics. We also fit the preditions of the model to different sets of experimental data and discuss the limits of the theory and the molecular meaning of the fitting parameters.
Internacional
Si
Nombre congreso
254th American Chemical Society National Meeting & Exposition - ACS Fall 2017
Tipo de participación
960
Lugar del congreso
Washington DC, EE.UU.
Revisores
Si
ISBN o ISSN
DOI
Fecha inicio congreso
20/08/2017
Fecha fin congreso
24/08/2017
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Título de las actas
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Jorge Ramirez Garcia (UPM)
  • Autor: Thomas J. Dursch (Massachusetts Institute of Technology)
  • Autor: Bradley D. Olsen (Massachusetts Institute of Technology)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Polímeros, Caracterización y Aplicaciones
  • Departamento: Ingeniería Química Industrial y del Medio Ambiente
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