In this note, the MW determination of a comb-like polymer was carried out by GPC and by membrane osmometry. It was found that the MW by GPC is smaller than by osmometry. The universal calibration curve in GPC and the Mark-Houwink-Sakurada equation were also drawn. The comb-like polymer ...
Molecular Weight DeterminationThe molecular weight of a polymeric or biological material usually has a direct effect on its mechanical properties, thermal behavior, and viscosity characteristics. There are a variety of analytical techniques used to characterize molecular weight in polymers, each providing ...
efficiency can be reached e.g., by reducing the thickness of the channel by a factor of two.Results presented in this paper confirm the prospects offered by the Field-Flow Fractionation method for determinations of molecular weights, and eventually also molecular weight distributions for polymers. ...
reveals a range of polymers of varyingmolecular weight. Such fractions will range from 200,000 to 400,000 inaveragemolecular weight. Theelectron microscopehas permitted measurement of the size of the molecular particles. Size/frequency data can then be converted into amolecular weight distribution...
In average molecular weight determination, there are two common osmometry techniques used, namely, the membrane and vapor pressure osmometry. In the membrane osmometry technique, a pure solvent and polymer solution are separated by a semipermeable membrane. Due to the higher chemical potential of the...
Key to the function of beta-glucans is their molecular weight and because of their high polydispersity - molecular weight distribution. Analytical ultracentrifugation provides a matrix-free approach (not requiring separation columns or media) to polymer molecular weight distribution determination. The ...
Measurement of Molecular Weight GPC for the analysis of hydrophobic polymers has traditionally been conducted using a differential refractive index detector (RID) because many synthetic polymer compounds don’t have the functional groups for UV absorbance and the solvent for GPC mobile phase such as ...
Molecular weight studies of poly-4-methyl-1-pentene were carried out by high temperature SEC and viscosity measurements. For SEC analyses, the samples were dissolved in a TCB/Decalin mixture by microwave heating and run at 135 °C with TCB as eluent. The conditions chosen were based on studie...
A major problem has been the characterization of the complete molecular weight distribution curve by fractionation methods because fraction collection and the determination of the various molecular weight averages of polymers is time consuming. Additionally, measurement of the number-average molecular weight...
High resolution end group determination of low molecular weight polymers by matrix-assisted laser desorption ionization on an external ion source fourier t... Matrix-assisted laser desorption ionization was performed on an external ion source Fourier transform ion cyclotron resonance mass spectrometer ...