weight-average molecular weight

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weight-average molecular weight:

see molecular weightmolecular weight,
weight of a molecule of a substance expressed in atomic mass units (amu). The molecular weight may be calculated from the molecular formula of the substance; it is the sum of the atomic weights of the atoms making up the molecule.
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References in periodicals archive ?
If we wish to use the weight average molecular weight we will need to use an entirely different family of kinetic models having several more parameters (as was done for PMMA by Sangwai et al.
The PP resin should have a 200,000 to 1,000,000 weight average molecular weight with a [M.
BASF has obtained a patent for a rheology modifier, which is a water-soluble polymer having a weight average molecular weight (Mw) of at least 1,000,000 g/ mol and an intrinsic viscosity of at least 2.
5 mass % or more and a ratio (Mw/ Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.
PF1 had a resin solids content of 39 percent and a weight average molecular weight of 780.
The number average molecular weight and the weight average molecular weight of the blends were calculated (equations (3) and (4)), along with the uniaxial extensional viscosity (Table 2).
Similarly, the weight average molecular weight is expressed as,
The melt strength of PP can be increased by at least four different ways: increasing the weight average molecular weight of PP, broadening the molecular weight distribution by incorporating high and low molecular weight chain fractions, blending PP with polymers such as low density polyethylene (LDPE), and introducing long chain branching (LCB) on the backbone of PP.
Imperial Chemical Industries has obtained a patent for a pigmented, aqueous coating comprised of an aqueous dispersion of non-crosslinkable addition oligomer of weight average molecular weight of 5000 to 15000 Daltons and calculated Fox Tg greater than 0[degrees] C and less than 50[degrees] C, an aqueous dispersion of addition polymer of weight average molecular weight greater than 53,000 Daltons, calculated Fox Tg greater than 10[degrees] C and less than 40[degrees] C and mean particle diameter of less than 150 nanometers and the ratio is from 0.
0] is steady shear (Newtonian) viscosity; and Mw is weight average molecular weight.
Specifically, the present invention provides a rubber composition for a tire comprising 5 to 200 parts by weight of a low molecular weight aromatic vinyl-conjugated diene copolymer having a specific aromatic vinyl content and weight average molecular weight, based on 100 parts by weight of a rubber component containing aromatic vinyl-conjugated diene copolymer, a rubber composition for a tire comprising 5 to 200 parts by weight of an olefin-conjugated diene-aromatic vinyl copolymer based on 100 parts by weight of a diene rubber component, and a tire using the same.
Figure 3 shows the effect of melt index (or weight average molecular weight, Mw) on melt strength for three hexene copolymer LLDPE resins having similar polymer structures in terms of polydispersity, comonomer distribution, and density.