STATIC AND DYNAMICAL PROPERTIES OF POLYSTYRENE IN TRANS-DECALIN .2. CORRELATION-FUNCTION PROFILE ANALYSIS BY THE HISTOGRAM METHOD

Measured single-clipped net signal photoelectron-count time correlation functions of polystyrene (NBS 705 standard, Mw =179300) in trans-decalin were analyzed by the histogram method. The line width distribution function G(Γ) was studied as a function of concentration, temperature, and scattering angle. We observed a fast gellike mode before the overlap concentration C* was reached. This fast gellike mode is responsible for the anomalous increase in the variance of the line width distribution in dilute solutions (as well as in the semidilute solution region) even though its magnitude can be quite small when C < C*. In the semidilute region, we have identified an upper concentration range (Cg) where the hydrodynamic mode becomes vanishingly small. Finally, decomposition of the line width distribution function permits us to sketch out semiquantitatively the excess integrated intensity behavior of polystyrene in irans-decalin from pure solvent to pure polymer. © 1979, American Chemical Society. All rights reserved.