Translational diffusion of rubrene and tetracene in polyisobutylene

TitleTranslational diffusion of rubrene and tetracene in polyisobutylene
Publication TypeJournal Article
Year of Publication1997
AuthorsBainbridge, D., and M. D. Ediger
JournalRheologica ActaRheologica ActaRheologica Acta
Volume36
Pagination209-216
Date PublishedMay-Jun
Type of ArticleArticle
ISBN Number0035-4511
Accession NumberWOS:A1997XL28600002
KeywordsAMORPHOUS POLYMERS, DIFFUSION, DISPERSION, DYNAMICS, GLASS-TRANSITION, local segmental, PROBE, probes, RELAXATION, ROTATION, SELF-DIFFUSION, SOLVENT SYSTEMS, SUPERCOOLED LIQUIDS, translational diffusion, VISCOELASTICITY, VISCOSITY
Abstract

The translational diffusion coefficients of rubrene and tetracene in amorphous polyisobutylene (PIB) were measured using the holographic fluorescence recovery after photobleaching technique. Over the temperature range from 400 to 235 K (T-g = 205 K), tracer diffusion coefficients from 10(-7) to 10(-14) cm(2)/s were observed. These diffusion coefficients have essentially the same temperature dependence as the rotational correlation times for these two probes in PIE. Both of these observables have a slightly stronger temperature dependence than does the viscosity. These results contrast strongly with the results of similar experiments on polystyrene and polysulfone. These results are consistent with the hypothesis that local segmental dynamics are more spatially homogeneous in PIE than in polystyrene and polysulfone.

Short TitleRheol. ActaRheol. Acta
Alternate JournalRheol. Acta