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For all synthetic polydisperse polymers: Mn < Mw < Mz < Mz+1 The polydispersity index is used as a measure of the broadness of a molecular weight distribution of a polymer, and is defined by: Polydispersity index = Mw Mn The larger the polydispersity index, the broader the molecular weight.
In polymer chemistry, the molar mass distribution (or molecular weight distribution) describes the relationship between the number of moles of each polymer species (Ni) and the molar mass (Mi) of that species. [1] In linear polymers, the individual polymer chains rarely have exactly the same degree of polymerization and molar mass, and there is always a distribution around an average value ...
Size exclusion chromatography (SEC) is frequently applied in industries and many labs for Mw and Mw distribution (MwD) determination because of its time and cost efficiency. Since the retention volume of SEC depends on the hydrodynamic volume rather than Mw, the use of globular coil-type standards Pulluan (P)-82, leads to a significant overestimation of Mw of many plant and fungal ...
Hi there, Did Gel permermeation Chromatography on Polystyrene in a lab session, the results have been given to us as an excel sheet with collumn headings "Retention Time, Reponse, MW, LogMW" We need to find Mp, Mw, Mn, Mz, Mz+1 and PD. I have figured out that Mp is at the crest of the peak, but i have no clue what to do to find Mn, Mw, Mz and Mz+1. then PD = Mn / Mw (or the other way around ...
Methods used to measure the molecular weight of polymers include the light scattering method, osmotic pressure method, and viscosity method. These allow obtaining the average molecular weight values. However, many polymers consist of molecules with not just one molecular weight, but rather a collection of molecules with many different molecular weights.
If you're in the business of analyzing macromolecules, there is a good chance that molecular weight is a parameter of interest. This is because molecular weight corresponds to polyer chain length, which is related to the material's physical properties. A convenient analytical technique to characterize a sample's molecular weight is GPC/SEC. However, there are a variety of GPC/SEC systems ...
Mz and Mz+1: these values are calculated based on molecular weight and abundance (obtained by ultracentrifugation and GPC software computation) The values are used for "comparison" purposes Known samples to unknown samples These averages are statistical moments calculated from the molecular weight distribution curve
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Molecular weight z+1-average Table 1.5 also includes two additional types of molecular weight average besides those already discussed. The following remarks describe some features of these two, the z- average molecular weight, and the viscosity average ... [Pg.41] Note that the weight and Z average molecular weights so obtained are only approximate and less than the true values. This is a ...
weight. In addition, several other averages are used to lesser extents including the Z average molecular weight (Mz) and the Z+1 average molecular weight (Mz+1). Jordi Labs excels at testing materials for the various molecular weight averages that are commonly used to provide information about polymers.