G1t JfTjexpf txdlnx

where t is the lag-time. The relaxation time distribution, x A(x), is obtained by performing the inverse Laplace transform (ILT) with the aid of a constrained regularization algorithm (REPES). The mean diffusion coefficient (D) is calculated from the second moments of the peaks as DC = (l-^r/ Q 2, where Q - (4 % voA,) sin( 9 /2) is the magnitude of the scattering vector and r = 1/x is the relaxation rate. Here © is the scattering angle, no the refractive index of pure solvent and X the wavelength of the incident light.

The Stokes-Einstein equation relates the cooperative diffusion coefficient (Dc) to the "bare" dynamic correlation length (2, d*) defined in terms of the temperature-dependentviscosityofthe solvent )in Eq.12:

where kB T is the thermal energy factor. Another parameter of choice that may be used in the Stokes-Einstein Eq.12 is the macroscopic shear viscosity v^m. We define the "true" dynamic correlation length (^d) as:


The viscosity of the blank solvents (MCH and BrBz) and polymer solutions was measured over the temperature range 0< T/ C < 80 using a Ubbelohde -type viscometer which was sealed immediately after loading the liquids. The data for the blank solvents were fit using the second order polynomial function:

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