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

被引：63
作者：
Cangialosi, Daniele [1 ]
Boucher, Virginie M. [2 ]
Alegria, A. [1 ,3 ]
Colmenero, J. [1 ,2 ,3 ]
机构：
[1] Ctr Fis Mat CSIC UPV EHU, San Sebastian 20018, Spain
[2] Donostia Int Phys Ctr, San Sebastian 20018, Spain
[3] Univ Pais Vasco UPV EHU, Dept Fis Mat, San Sebastian 20018, Spain
来源：
JOURNAL OF CHEMICAL PHYSICS | 2011年 / 135卷 / 01期
关键词：
GLASS-TRANSITION TEMPERATURE; ULTRATHIN POLYSTYRENE FILMS; POLYMER-FILMS; ENTHALPY RECOVERY; PMMA/SILICA NANOCOMPOSITES; POSITRON-ANNIHILATION; STRUCTURAL RELAXATION; IMMOBILIZED POLYMER; GAS-PERMEABILITY; MODEL;
D O I：
10.1063/1.3605600
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3605600]
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页数：9
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