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Determination of Average Molecular Weights

Determination of Weight Average Molecular weight by Light Scattering... [Pg.111]

ASTM D 4001-93, Test Method for Determination of Weight-Average Molecular Weight of Polymers by Light Scattering, ASTM, West Conshohocken, Pennsylvania, 1997. [Pg.162]

Table 4.2. Determination of weight average molecular weight and particle scattering factor by light scattering for connective tissue macromolecules reproduced... Table 4.2. Determination of weight average molecular weight and particle scattering factor by light scattering for connective tissue macromolecules reproduced...
The presence of two hydroxyl groups per molecule in poly-(methyl methacrylate) and in polystyrene, each polymerized in aqueous media using the hydrogen peroxide-ferrous ion initiation system, has been established " by chemical analysis and determination of the average molecular weight. Poly-(methyl methacrylate) polymerized by azo-bis-isobutyronitrile labeled with radioactive has been shown to... [Pg.111]

The determination of the molecular weight of nanoparticles is performed by gel permeation chromatography (GPC). The experimental setup consists of a high performance liquid chromatography system with a size exclusion column and a refractive index detector. The nanoparticles are usually freeze-dried and dissolved in tetrahydrofuran for analysis on the system. Poly(styrene) or poly(methylmethacrylate) standards are used to calibrate the column, to enable the determination of number average molecular weight (Mn), as in... [Pg.10]

Determination of the average molecular weight and its distribution can be assessed by gel permeation or size-exclusion chromatography on solution polymers. The crystallinity of a polymer can be measured by DSC, density or X-ray diffraction. [Pg.170]

Zimm plot Type of double extrapolation used to determine the weight-average molecular weight in light-scattering photometry. [Pg.80]

The amount of excess light scattered by dilute polymer solutions compared with that scattered by the pure solvent is used routinely to determine the weight average molecular weight of polymers, A/, ... [Pg.53]

Determination of Number-Average Molecular Weights by Ebulliometry... [Pg.7]

The introduction of the kinematic viscosity has been proved to be of high value for the investigation and characterization of mineral oils it can replace in many cases the determination of the average molecular weight which now can be predicted. [Pg.122]

Figure 13.4. Apparent MWs of HS from different environments as determined by SEC [compiled from the data reported by Perminova et al. (2003)]. Bars represent a range of weight-averaged molecular weights determined for different groups of humic materials. Two black dots represent two IHSS standards Suwannee River FA and HA. SEC chromatograms were obtained with column-packing Toyopearl HW-50S using 0.028 M phosphate buffer at pH 6.8 as a mobile phase. Two different sets of standards were used to calibrate the column polystyrene sulfonates (PSS) and polydextrans the upper MW scale corresponds to dextran calibration and the bottom one—to PSS calibration. Figure 13.4. Apparent MWs of HS from different environments as determined by SEC [compiled from the data reported by Perminova et al. (2003)]. Bars represent a range of weight-averaged molecular weights determined for different groups of humic materials. Two black dots represent two IHSS standards Suwannee River FA and HA. SEC chromatograms were obtained with column-packing Toyopearl HW-50S using 0.028 M phosphate buffer at pH 6.8 as a mobile phase. Two different sets of standards were used to calibrate the column polystyrene sulfonates (PSS) and polydextrans the upper MW scale corresponds to dextran calibration and the bottom one—to PSS calibration.
FIGURE 7.8 Determination of number average molecular weight by osmometry. [Graph reconstructed from data by Roughton and Kendrew, Haemoglobin, Butterworth, London, 1949, p. 197.]... [Pg.431]

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Average molecular weight

Averages, of molecular weights

Determination of number-average molecular weights

Determination of the Number-Average Molecular Weight

Determination of weight-average molecular weights

Determination of weight-average molecular weights

Determination weight

Molecular averages

Molecular determinant

Molecular determination

Molecular weight averages determination

Molecular weight averaging

Molecular weight determination of

Molecular weight determining

Molecular weight-averaged

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