Influence of the molecular architecture on the secondary relaxations of Poly(styrene-co-methylmethacrylate) copolymers

Guzmán Solís, Eduardo; Ortega, Francisco; González Prolongo, Margarita; Starov, Victor M. y González Rubio, Ramón (2011). Influence of the molecular architecture on the secondary relaxations of Poly(styrene-co-methylmethacrylate) copolymers. "The European Physical Journal, E", v. 34 (n. 13); pp. 134-140. ISSN 1292-8941. https://doi.org/10.1039/C1CP21967G.

Descripción

Título: Influence of the molecular architecture on the secondary relaxations of Poly(styrene-co-methylmethacrylate) copolymers
Autor/es:
  • Guzmán Solís, Eduardo
  • Ortega, Francisco
  • González Prolongo, Margarita
  • Starov, Victor M.
  • González Rubio, Ramón
Tipo de Documento: Artículo
Título de Revista/Publicación: The European Physical Journal, E
Fecha: 2011
Volumen: 34
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Materiales y Producción Aeroespacial
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

The processes of adsorption of grafted copolymers onto negatively charged surfaces were studied using a dissipative quartz crystal microbalance (D-QCM) and ellipsometry. The control parameters in the study of the adsorption are the existence or absence on the molecular architecture of grafted polyethyleneglycol (PEG) chains with different lengths and the chemical nature of the main chain, poly(allylamine) (PAH) or poly(L-lysine) (PLL). It was found out that the adsorption kinetics of the polymers showed a complex behavior. The total adsorbed amount depends on the architecture of the polymer chains (length of the PEG chains), on the polymer concentration and on the chemical nature of the main chain. The comparison of the thicknesses of the adsorbed layers obtained from D-QCM and from ellipsometry allowed calculation of the water content of the layers that is intimately related to the grafting length. The analysis of D-QCM results also provides information about the shear modulus of the layers, whose values have been found to be typical of a rubber-like polymer system. It is shown that the adsorption of polymers with a charged backbone is not driven exclusively by the electrostatic interactions, but the entropic contributions as a result of the trapping of water in the layer structure are of fundamental importance.

Más información

ID de Registro: 12059
Identificador DC: http://oa.upm.es/12059/
Identificador OAI: oai:oa.upm.es:12059
Identificador DOI: 10.1039/C1CP21967G
URL Oficial: http://pubs.rsc.org/en/Content/ArticleLanding/2011/CP/c1cp21967g
Depositado por: Memoria Investigacion
Depositado el: 19 Sep 2012 10:31
Ultima Modificación: 21 Abr 2016 11:13
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