Polystyrene mixture

FIQ. 3 Diffusion coefficient of benzene molecules in benzene-polystyrene mixtures normalized by the diffusion coefficient of neat benzene molecular dynamics results, NMR measurements and prediction by the Mackie-Meares model [26]. 

Fauske and Associates, Inc., Flashing Viscous Flow of Polystyrene Mixtures Test Data and Scale-Up Methods, FAI/ 89-26, April 1989. 

Figure 9. Flow Rate-Independent SEC-Viscoslty Detection Sanple polystyrene mixture (1.8M + lOOK + 9K) Solvent THF, Concentration 0.08%...

Figure 11 illustrates an SEC separation of a sample of 3-conponent polystyrene mixture with the dual concentration and viscosity detectors of Figure 10. The top trace shows the concentration elution profile of the SEC separation as detected by a uv-photometer. The bottom trace records the same SEC separation, except with the viscometer signal from the log-amplifier output.

Figure 11-8. Center of mass radial distribution functions for aromatic groups (benzene and/or phenyl) for two benzene-polystyrene mixtures. The normalization is chosen so that all radial distribution functions approach 1 at infinity. The figure is taken from Miiller-Plathe [78]...

Einaga, Y. Nakamura, Y. Fujita, H., "Three-Phase Separation in Cyclohexane Solutions of Binary Polystyrene Mixtures," Macromolecules, 20, 1083 (1987). 

Nishi, T. Kwei, T. K., "Cloud Point Curves for Poly(vinyl methyl ether) and Monodisperse Polystyrene Mixtures," Polymer, 16, 285 (1975). 

Lundberg. Bull s data at T = 298.15 K have been used for the activity of water in this system." Starkweather has determined the activity of water in the concentration range 0 volume fraction as ai = 12 1, the expression that was used in our calculations. The molecular weight and the partial specific volume of collagen were taken from ref 41. The results of the calculations are presented in Figures IB, 2B, and 3B. In contrast to the toluene + polystyrene mixture, the solvent (water) is in deficit around a central water molecule but in excess around a protein molecule. 

Let us emphasize the physical significance of the obtained results regarding the excesses (deficits). A n > 0 means preferential hydration (or solvation in the case of toluene + polystyrene mixture) of the solvent molecules, and A i2 > 0 means that the polymer (protein) molecules are preferentially hydrated (or solvated for the toluene + polystyrene mixture). 

In contrast to Ann, Ann 0 for all mixtures investigated, and hence, the polymers or proteins are preferentially hydrated (solvated in the case of toluene + polystyrene mixture). Let us examine separately the contributions to Ann provided by the entropic and enthalpic factors. The contribution to Ann provided by the different sizes of the solvent and polymer (protein) molecules will be evaluated from the excess in an ideal... 

First, different data sets (away from and at binodal) must be scaled to the identical temperature and concentrations. This is possible for a few blends with (assumed) identical interaction parameter but characterized by different chain lengths (Na, Nb) and hence different phase diagrams. This method is used for isotopic polystyrene mixtures. If the parameter ySANs((t)) is linear with 1/T for each concentration < > then %SANS(=const, T) can be reasonably extrapolated to regions at or inside coexistence curve. We use this solution for olefinic blends composed of random copolymers E EE. Here the self-same mixtures are used in both bulk SANS samples and in profiled thin films. 

Figure 15.10 Separation of a polystyrene mixture with a broad molecular mass range [reproduced with permission from R.V. Vivilecchia, B.G. Lightbody, N.Z. Thimot and H.M. Quinn, J. Chromatogr. Sci., 15, 424 (1977)]. Mobile phase, 2mlmin dichloromethane. Molecular masses 1=2145000 2 = 411000 3 = 170 000 4 = 51 000 5 = 20 000 6= 4000 7 = 600 8 = 78 (benzene).

Styrene homopolymers are produced by a free radical polymerisation, that proceeds to completion as the styrene/polystyrene mixture is taken through... 

Erichson, J., Shiferaw, T, Zaporojtchenko, V, and Faupel, R, Surface glass transition in bimodal polystyrene mixtures, Eur. Phys. J. E, 24, 243-246 (2007). 

Figure 8.12 High-speed separation of three-component polystyrene mixture in a 0.051-mm-thick thermal FFF channel. The higher speed shown in (b) is due to the higher channel flow velocity, (v) = 3.05cms versus 0.56cms for (a). The temperature drop AT was held at 60°C [42].

It is well-known that many polymers, synthetic and natural, form physical, thermoreversible aggregates in dilute solutions, whereas in moderately concentrated solutions gels can be formed. Examples are poly(vinyl chloride), polyacrylonitrile, poly(vinyl alcohol), atactic polystyrene, mixtures of syndiotactic and isotactic poly(methyl methacrylates), liquid crystalline polymers, gelatin, agarose, carrageenans etc. 

Ugfit-water reactor hiels normally consist of natural or depleted uranium enriched with up to 8 wt% Pu. Criticality data, even on uranium systems at this low a enrichment, are sparse. For homogeneous uranium enriched with-plutonium, data are essentially nonexistent. To obtain criticality data in this area, experfinents were recently completed with a PuOz-UOa-polystyrene mixture coiAaining 7.6 wt% Pu in the Pu+U. The H Pu-i-U atomic ratio Of the fiiel mixture was 19.5, which is near the optimum concentration for minimum critical volume. 

T. Nishi and T. Kwei, Cloud point curves for poly(vinyl methyl ether) and monodisperse polystyrene mixtures. Polymer, Wol. 16, 285-290, 1975. 

KA Okada, M., Inoue, G., Ikegami, T., Kimura, K., and Furukawa, H., Composition dependence of polymerization-induced phase separation of 2-chlorostyrene/ polystyrene mixtures, Polymer, 45, 4315,2004. 

RIC Ricoa, M., Borrajo, J., Abad, M.J., Barral, L., and Lopez, J., Thermodynamic analysis of phase separation in an epoxy/polystyrene mixture, Polymer, 46, 6114, 2005. 

Comments The volume fraction of polystyrene (C) in the polystyrene mixture is 0.1704. The... 

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