Molecular weight relative viscosity

Data from SPE ANTEC 1991 Conference Proceedings 0.2 Specimen Higher molecular weight, relative viscosity -5.0 in m-cresol, blow molding grade... 

Polybutene resins. These liquid resins are obtained by cationic polymerization of petroleum C4 streams in the presence of AICI3 at relatively low temperature. Temperature and AICI3 concentration are important factors as they influence the molecular weight and viscosity of the final resin. After reaction, the mixture is deactivated with water, methanol, ammonia or aqueous sodium hydroxide. The organic layer is separated and distilled to remove solvent and unconverted material. 

ASTM, Standard Test Method for Estimation of Molecular Weight (Relative Molecular Mass) of Petroleum Oils from Viscosity Measurements, ASTM Standard D-2502-92, 1992. 

Comparison of extrapolations obtained by this equation provides some insight into the relative importance of phenol content and molecular weight to viscosity. For example, a typical asphaltene from a noncatalytic process might have a phenol content of 2 meq/g and a molecular weight of 700. The calculated logarithmic viscosity number is 5.7 mL/g. By extrapolation in the... 

The sizes determined in this work are the apparent molecular sizes and not necessarily the sizes of the asphaltene and maltene molecules at process conditions. Association efforts for asphaltene molecules have been observed for both vapor-phase osmometry molecular weight and viscosity measurements (14, 15). The sizes reported here were measured at 0.1 wt % in tetrahydrofuran at room temperature. Other solvent systems (chloroform, 5% methanol-chloroform, and 10% trichlorobenzene-chloroform) gave similar size distributions. Under these conditions, association effects should be minimized but may still be present. At process conditions (650-850°F and 5-30% asphaltene concentration in a maltene solvent), the asphaltene sizes may be smaller. However, for this work the apparent sizes determined can be meaningfully correlated with catalyst pore size distributions to give reasonable explanations of the observed differences in asphaltene and maltene process-abilities (vide infra). In addition, the relative size distributions of the six residua are useful in explaining the different processing severities required for the various stocks. Therefore, the apparent sizes determined here have some physical significance and will be referred to just as sizes. 

For typical thermal plastic, not only the viscosity has temperature dependence, but it also strongly depends on the polymer s molecular weight relative to the so-called critical molecular weight of a given polymer M. can be interpreted as the molecular weight at which a temporary network of entanglements... 

Table 7 Intrinsic Viscosities and Weight-Average Molecular Weights (Relative to PEO) of PVP/VA and PVP/DMAEMA/VC...

NaOH (1%, wt/vol) and then diluted with the pH 9 buffer to the proper concentration for analysis. The SEC chromatograms are shown in Figure 10. The separation is reasonably good however, a baseline separation between the solvent peak and the low-molecular-weight end of the copolymer peak could not be achieved. The weight-average molecular weights (relative to PEO standards) and intrinsic viscosities of PVP/AA are shown in Table 8. A 100% recovery was achieved for PVP/AA in SEC. 

Poly(vinyl alkyl) ethers were obtained as follows Poly(vinyl ethyl ether) - EDBC from Union Carbide. This material is relatively low in molecular weight (reduced viscosity 0.3 + 0.1 in benzene, 0.1 gm/100 ml at 20 C) and contains 0.5% monotertiary butyl hydroquinone stabilizer. It consists of 98% nonvolatiles. In some cases, PVEE, manufactured by BASF-Wyandotte, was used (A-25 and A-50 with reduced viscosities of 0.07 and 0.66 respectively in... 

Table 9.1 Molecular weight, density, viscosity (at 25°C), diffusivity coefficient, relative permittivity and chemical formula of the solvents used for nanoparticles synthesis.

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