Chlorobenzene refractive index

The effects of temperature on the color development of the porous film in chlorobenzene were shown in Table 6 [23]. The coloration was reversible thermochromism. The refractive index of the materials generally decreases as the temperature increases, and the temperature dependence of the liquid is greater than that of the solid. For example, the temperature dependence (A/id/°C) of PVA and chlorobenzene was found to be 3.0 x 10 and 4.5 x 10" at 589.3 nm. Consequently, it is interpreted that the wavelength of the crosspoint between the dispersion curves of PVA and chlorobenzene shifts from the long side to the short side with increasing tem-... 

Kalali, H., Kohler, F., and Svejda, P. Vapor pressure, density, refractive index, excess enthalpy, and heat capacity of 2-chloro-2-methylpropane or chlorobenzene + 2,2,4-trimethylpentane, J. Chem. Eng. Data, 37(1) 133-136, 1992. 

In search of less expensive, less toxic, and lower viscosity eluants, a few authors have proposed diluting the active ingredient with a common SEC eluant such as toluene, dichloromethane, or chloroform. To lower the operating temperature and minimize polymer degradation, mixtures of m-cresol with chlorobenzene (50 50, v/v, 43°C), dichloromethane (50 50, room temperature), and chloroform have been used, with 0.25 wt% benzoic acid added to prevent adsorption. In the same vein, o-chlorophenol has been diluted with chloroform (25 75) and used at 20°C. The main disadvantage in this latter solvent was a small dnidc for the polymer, which rendered refractive index measurements difficult. In addition, careful purification of the phenol is required to obtain a detection signal. Dichloroacetic acid diluted to 20 vol% with dichloromethane has been proposed as the mobile phase. However, even at this concentration, PA tends to degrade at room temperature. 

The chromatogram depicted in Figure 10.1 demonstrates this point. Benzene (2), chlorobenzene (3), o-dichlorobenzene (4) and iodobenzene (5) were eluted on a reversed-phase column by various methanol-water mixtures (1 being the refractive index peak of the solvent used for sample dissolution). 

Polymerization was carried out at 60 °C for 24 h in chlorobenzene. [M]o (initial monomer concentration) = 0.25. Monomer to catalyst mole ratio. Methanol-insoluble polymer. " Values were obtained by GPC analysis with polystyrene standards calibration (Waters high-pressure GPC assembly Model M590 pump /<-Styragel columns of 10 , 10, 10, 500, and 100 A refractive index detectors, solvent, THF). 

The solvents used in analytical TREF are limited to chlorinated solvents, mainly ort/io-dichlorobenzene and 1,2,4 tri-chlorobenzene (perchloroethylene and a-chloronaphtalene have also been used), which can dissolve the polyolefins at high temperature and are transparent enough in the IR region of measurement. These solvents are the same as used in GPC/SEC analysis of polyolefins and are also appropriate for detection by refractive index, although this detector has not... 

Using Void s equation and estimating 33 from refractive index measurements, Elworthy and Florence [20] obtained a result which is surprising in the light of Ottewill s calculations the adsorbed layer increased the attraction between chlorobenzene particles dispersed in water. Both theoretical and experimental derivation of 433 assumed that the surfactant layer is homogeneous. This is an over simplification. 

Figure 3a shows the change in indexes before and after poling in the dark in N2. The index of refraction of the mode having its electric field is in the plane of the film (transverse electric) is n g. The index of refraction of the mode having its electric field is nearly perpendicular to the plane of the film (transverse magnetic) is Unpoled films that were bladed from the pyiidine/chlorobenzene solutions showed a small... 

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