Local segmental dynamics of polyisoprene in dilute solution: picosecond holographic grating experiments

TitleLocal segmental dynamics of polyisoprene in dilute solution: picosecond holographic grating experiments
Publication TypeJournal Article
Year of Publication1986
AuthorsHyde, Patrick D., Waldow Dean, Ediger M. D., Kitano Toshiaki, and Ito Koichi
JournalMacromolecules
Volume19
Issue10
Pagination2533-8
AbstractA picosecond holog. grating technique was used to observe the local segmental dynamics of anthracene-labeled polyisoprene in dil. hexane and cyclohexane solns. The transition dipole of the anthracene label lies along the chain backbone, ensuring that only backbone motions are detected. The exptl. observable, the orientation autocorrelation function of a backbone bond, is compared with theor. predictions. The obsd. correlation functions are consistent with models proposed by Hall and Helfand and by Bendler and Yaris. The correlation functions for the 2 solvents have the same shape within exptl. error while the time scale of the decays varies roughly with the solvent viscosity. The correlation function decays on a subnanosecond time scale in both solvents.