Light scattering behavior

The formation of a compact structure accompanying the complexation of PMMA with PEO and the lower flexibility of the PMMA chain in the complex than that of the PAA chain have been confirmed by viscometry [ 16], membrane contraction [2], and polarized luminescence techniques [3]. In addition, comparison of the dynamic light-scattering behavior of PMAA/PEO and PMAA/PEO" in solution shows that the pyrene label, which acts as a hydrophobic species, allows the labeled PEO to aggregate intermolecularly much faster than unlabeled PEO does [30]. 

Recently, Strazielle et al. (48) observed appreciable preferential adsorption when they examined the light-scattering behavior of PBLG in heptane, cyclohexane, and EDC, each containing an appropriate amount of DCA. As should be expected, no such effect manifested itself in a mixture of DCA and cyclohexanol, which had essentially equal refractive indices. 

The light-scattering behavior of those polysilanes studied indicates that they are slightly extended and stiffened compared with typical polyolefins. One measure of chain flexibility is the characteristic ratio C, which is also shown in the table. The values of C for most polysilanes of about 20 are larger than those for typical hydrocarbon polymers (—10), indicating that the polysilanes are somewhat less flexible than polyolefins. However, poly(diarylsilylene)s are much more rod-like and inflexible, with persistence lengths greater than 100 46... 

These types of models and measurements provide an invaluable insight into the stractural evolution of gel networks. From measurements of viscosity and light-scattering behavior, sufficient understanding is gained to begin to tailor gel structures for specific applications. 

When the attractive interactions are strong enough, a phase separation between droplet-rich and droplet-poor phases occurs above a critical point. The light scattering behavior close to the critical point is similar to that of simpler fluids. The scattered intensity... 

Degree of Branching — a branched polymer fr u tly has different properties than its linear analog, such as, lower tendency to crystallize, different solution properties and light scattering behavior. 

T.H. Wines and P. Somasundaran2002, Effects of adsorbed block copolymer and comb-like amphiphilic polymers in solution on the electrical percolation and light scattering behavior of reverse microemulsions of heptane/water/AOT, J. Colloid Interf. Sci. 256, 183-189. 

TA1 Takahashi, S., Hassler, J.C., and Kiran, E., Light scattering behavior and the kinetics of pressure-induced phase separation in solutions of poly(e-caprolactone) in acetone + CO2 binary fluid mixtures, Polymer, 54, 5719, 2013. 

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