Abstract
The internal motions of narrowly distributed flexible polymer chains in extremely dilute solutions were studied by dynamic laser light scattering (LLS). We focused on the temperature-dependent relative intensity of the internal motions AI/(AI + AD), where AI and AD are the scattered light intensities, respectively, related to the internal motions and diffusive relaxation and obtainable from their related peak areas when ⟨Rg2⟩q2 > 1, where ⟨Rg2⟩ and q are the radius of gyration and the scattering vector, respectively. The results from four different polymer solutions reveal a maximum or turning point of AI/(AI + AD) near the theta temperature (Θ), confirming that the thermal energy can excite more internal motions when two-body and higher-order interactions diminish. Our study illustrates that dynamic LLS can be used to determine the Θ condition in a better way, in which only one dilute solution is needed in comparison with a set of polymer solutions previously required.
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