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Title

Free volume holes diffusion to describe physical aging in poly(mehtyl methacrylate)/silica nanocomposites

AuthorsCangialosi, Daniele ; Boucher, Virginie M. ; Alegría, Ángel ; Colmenero de León, Juan
Issue Date2011
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 135(1): 014901 (2011)
AbstractThe spontaneous thermodynamically driven densification, the so-called physical aging, of glassy poly(mehtyl methacrylate) (PMMA) and its nanocomposites with silica has been described by means of the free volume holes diffusion model. This mechanism is able to account for the partial decoupling between physical aging and segmental dynamics of PMMA in nancomposites. The former has been found to be accelerated in PMMA/silica nanocomposites in comparison to “bulk” PMMA, whereas no difference between the segmental dynamics of bulk PMMA and that of the same polymer in nanocomposites has been observed. Thus, the rate of physical aging also depends on the amount of interface polymer/nanoparticles, where free volume holes disappear after diffusing through the polymer matrix. The free volume holes diffusion model is able to nicely capture the phenomenology of the physical aging process with a structure dependent diffusion coefficient.
Description9 páginas, 5 figuras, 3 tablas.-- Trabajo presentado al "MACRO2010: 43rd IUPAC World Polymer Congress" celebrado en Glasgow (U.K.) del 11 al 16 de julio de 2010.
Publisher version (URL)http://dx.doi.org/10.1063/1.3605600
URIhttp://hdl.handle.net/10261/44052
DOI10.1063/1.3605600
ISSN0021-9606
E-ISSN1089-7690
Appears in Collections:(CFM) Artículos
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