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Report No.

Dynamics of polystyrene in a theta solvent investigated by neutron spin echo

Endo, Hitoshi

Dynamics of polystyrene in cyclohexane at the theta temperature was investigated by neutron spin echo. The intermediate scattering function up to 50 nano seconds could be observed, then the result was quantitatively compared with the Zimm theory, where the Gaussian approximation for polymer dynamics and the preaveraging approximation for hydrodynamics effect are applied. It was found that the theory and the experimental result only agreed in low momentum transfer $$Q$$ range ($$Qtimes b<1$$ with the effective bond length $$b$$), which deviated gradually at higher $$Q$$. The experimentally observed decay rate was approximately factor 0.5 smaller than the theoretical prediction at the experimental $$Q$$ maximum ($$Qapprox 0.1 rm AA^{-1}$$).



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Category:Physics, Multidisciplinary



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