Time-resolved optical spectroscopy as a probe of local polymer motions

TitleTime-resolved optical spectroscopy as a probe of local polymer motions
Publication TypeJournal Article
Year of Publication1987
AuthorsWaldow, Dean, Hyde Patrick D., Ediger M. D., Kitano Toshiaki, and Ito Koichi
JournalACS Symposium Series
Volume358
IssuePhotophys.
Pagination68-82
AbstractA picosecond holog. grating technique was used to observe the local segmental dynamics of anthracene (I)-labeled polyisoprene (II) in dil. hexane, cyclohexane, and 2-pentanone solns. The transition dipole of the I label lies along the chain backbone, assuring that only backbone motions are detected. Exptl. measurements of the orientation autocorrelation function of a backbone bond are compared with theor. predictions. The obsd. correlation functions are consisted with models proposed by Hall and Hilfand and Bendler and Yaris. Anal. of the temp. dependence of the correlation function yielded an activation energy of .apprx.7 kJ/mol for local segmental motions.