Light scattering scattered intensity

Oxidative chain degradation was seen to be responsible for the loss in viscosity caused by initiator residuals. However, instability was also detected viien high purity samples were free a of residual initiator. Parallel to the viscometric studies, the behavior of PAAm in aqueous solution was evaluated by light scattering. Scattering intensity decreased... 

Raman Spectroscopy. Raman spectroscopy is an excellent method for the analysis of deuterium containing mixtures, particularly for any of the diatomic H—D—T molecules. For these, it is possible to predict absolute light scattering intensities for the rotational Raman lines. Hence, absolute analyses are possible, at least in principle. The scattering intensities for the diatomic hydrogen isotope species is comparable to that of dinitrogen, N2, and thus easily observed. 

In the case of EFLS we observe the change in light scattering intensity when a strong... 

Figure 3. Change in light scattering intensity (Rjo ) upon photo-irradiation of the micelle of 2a. [2] = M. AABS at 450 nm...

Figure 3.12. Light-scattering intensity as a function of the wave vector for an emulsion with 4> = 4% at a series of times. The inset shows that, except at the earliest times, the data can be scaled onto a single curve. (Adapted from [27].)...

The interesting feature that Lipatov, et al. [1 ] assumed was that the light-scattering intensity at low angles depends on the square of the difference between c and c, which arises from the appearance of (dn/dc) in the scattering optical constant H, noting that the size and shape of the domains is constant with time. Hence,... 

Figure 7 Concentration dependence of the reduced light scattering intensity extrapolated to zero angle for PS-S03Li-40 in cyclohexane at 27.5°C. The solid line represents the model calculation with 3 10 (1/mol) and N 12. The dashed line indicates M] = 49,000.

Figure 3.10 Variation of light scattering intensity during cure at 150°C in 10 wt% PEI blend (a.u. arbitrary unit)...

The equilibrium structure is considered of flexible polymer chains within the RIS model. This model is solved by an irreducible tensor method which is somewhat different from, and simpler than, the approach of Flory and others. The results are used to compute the light scattering intensities from dilute solutions of flexible polymer chains, and the angle dependence is found... 

All factors related to the arrangement of the polymer chain in space are classified as tertiary structure. Parameters measurable directly (the radius of gyration RG, the end-to end distance h, the hydrodynamical radius RH, and the asymmetry in light scattering intensity) or indirectly (interaction parameters, the second virial coefficient A2) are related to the dimensions, such as size and shape of the polymer chain in a specific solvent under given conditions of temperature and pressure. For the exact determination of the coil size of macromolecules, it is necessary to ensure that measure-... 

Fig. 3.4 Showing the coexistence of molecules and micelles via dynamic light scattering. Intensity fraction versus the apparent hydrodynamic radius for solutions of PBO, PEOwPBOs (120gem 3, 20 and 40°C) (Booth et al. 1997 Yang et al. 1996a). Here PBO denotes poly(oxybutylene) and PEO poly(oxyethylene). The peaks correspond to molecules (or molecular clusters) at small values of / hi>pp and to micelles at large values Ol f h.app ...

Fig. 3.12 Intensity contribution function, extracted from dynamic light scattering intensities, versus apparent hydrodynamic radius for PBO PEO PBOiz in aqueous solution at 10 °C and different concentrations (indicated) (Zhou el al. 1996c),...

It is instructive to make a quantitative comparison between the experimental and theoretical curves. The light scattering intensity, expressed as the Rayleigh ratio, is a function of the size and number of particles. If all three reactions shown in Figure 7 polymerize at the same rate, Rp, then at a given time, say 10 seconds, the total volume of polymer formed, VT, will be the same in all three. Under these conditions, the scattering intensity becomes a direct measure of the relative number of particles ... 

Some recent evidences have shown that a basic PRP binds condensed tannins much more effectively than a-amylase. In Figure 16.10, it can be seen that the light-scattering intensity caused by aggregation increases with the concentration of procyanidins until a maximum after which the light scattered intensity remains constant even with a further increase in tannin concentration. 

Fig. 12. Processes leading to changes in the light scattering intensity (LSI) [74]...

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