Heterogeneous dynamics during deformation of a polymer glass

TitleHeterogeneous dynamics during deformation of a polymer glass
Publication TypeJournal Article
Year of Publication2010
AuthorsRiggleman, R. A., H. N. Lee, M. D. Ediger, and J. J. de Pablo
JournalSoft Matter
Volume6
Start Page287
ISBN Number1744-683X
Accession NumberWOS:000273576800013
KeywordsCREEP, FLUID, LIQUID, MOBILITY, RELAXATION
Abstract

The origins of molecular mobility in polymer glasses, particularly under deformation, are not well understood. A concerted experimental and computational approach is adopted to examine the segmental motion of a polymeric glass undergoing creep and constant strain rate deformations. Through a combination of molecular dynamics simulations and optical photobleaching experiments we are able to directly probe how dynamic heterogeneity evolves during deformation. Two distinct regimes emerge from our analysis; early in the deformation, the dynamics of the glass are strongly heterogeneous, as evidenced by the spectrum of relaxation times measured experimentally and the participation ratio of the atomic non-affine displacements measured computationally. After the onset of flow, the dynamics become significantly more homogeneous, and the participation ratio increases considerably.

DOI10.1021/ma301501z