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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Key statement: A rubber composition containing 100 parts by mass of a rubber component (A) comprising at least one rubber of natural rubber and synthetic diene base rubbers and 5 to 120 parts by mass of a low molecular weight aromatic vinyl compound-diene compound copolymer (B) having a weight average molecular weight (measured by gel permeation chromatography and reduced to polystyrene) of 1,000 to 300,000 and wherein the copolymer (B) comprises 0 to 80% by mass of an aromatic vinyl compound and has a vinyl bond content of 0 to 80% by mass in the part of the diene compound and has a crosslinkable functional group at an end.
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.
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 present invention relates to a rubber composition for tires, including: a modified diene rubber A which has been terminally modified with a specific acrylamide compound; a modified diene rubber B which has been modified with a silicon or tin compound and a specific modifying compound or with the modifying compound; and a silane coupling agent containing a mercapto group, the modified diene rubbers A and B, taken as a whole, having a weight average molecular weight falling within a specific range.
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.
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.