Title | TEMPERATURE-DEPENDENCE OF MOLECULAR MOTIONS IN BULK POLYSTYRENE |
Publication Type | Journal Article |
Year of Publication | 1994 |
Authors | Blackburn, F. R., M. T. Cicerone, and M. D. Ediger |
Journal | Journal of Polymer Science Part B-Polymer PhysicsJournal of Polymer Science Part B-Polymer PhysicsJournal of Polymer Science Part B-Polymer Physics |
Volume | 32 |
Pagination | 2595-2604 |
Date Published | Dec |
Type of Article | Article |
ISBN Number | 0887-6266 |
Accession Number | WOS:A1994PU61000005 |
Keywords | DEPOLARIZATION, DIELECTRIC-RELAXATION, DYNAMICS, GLASS-RUBBER RELAXATION, LABELED-CHAIN DYNAMICS, LOCAL POLYMER, PHOTON-CORRELATION SPECTROSCOPY, POLYISOPRENE, PROBE ROTATION, PROBE TRANSLATION, REORIENTATION, ROTATIONAL, SEGMENTAL DYNAMICS, TETRAHYDROFURAN, TIME-RESOLVED OPTICAL SPECTROSCOPY, TRANSITION, VISCOSITY |
Abstract | Time-resolved optical spectroscopy is used to investigate the reorientation of three rigid probes and one labeled chain in bulk polystyrene. Orientational correlation times for these probes and labels are found to be in the range of 10(-8)-10(-10) s at temperatures of 180-300 degrees C. Consistent with previous studies, the attachment of a chromophore into the chain backbone slows its dynamics by about an order of magnitude. The temperature dependences of the correlation times are similar to the temperature dependence of the viscosity. When combined with probe reorientation times near and below T-g, these results indicate that probe reorientation tracks the temperature dependence of the viscosity quite well over twelve decades in time. In contrast, literature results for the translational diffusion of similarly sized probes indicates a substantially weaker temperature dependence near T-g. Thus it appears that a fundamental change in the mechanism of probe motion occurs near T-g. (C) 1994 John Wiley and Sons, Inc. |
Short Title | J. Polym. Sci. Pt. B-Polym. Phys.J. Polym. Sci. Pt. B-Polym. Phys. |
Alternate Journal | J. Polym. Sci. Pt. B-Polym. Phys. |