average molecular weight

average molecular weight

[′av·rij mə′lek·yə·lər ′wāt]
(organic chemistry)
The calculated number to average the molecular weights of the varying-length polymer chains present in a polymer mixture.
References in periodicals archive ?
The number average molecular weight (Mn) and polydispersity (HI) values of comb copolymer were found as (Mn=6900g/mol), (HI=1.68).
[[bar.N].sup.0.sub.n], [[bar.N].sub.n], and p represent the original weighted average molecular weight, the weighted average molecular weight after scission happening, and the density, respectively.
A failed part returned from the field exhibited excessive reduction in average molecular weight. A review of product that had not yet been assembled showed that the problem was greater than just an errant start-up part; the molecular weight of the product varied widely from marginal to considerably worse than what had been returned from the field.
The nanocomposites were characterized by GPC analysis to determine the average molecular weight of the matrix, XRD, TEM, and rheological analysis to obtain information on the relative degree of exfoliation.
The low-volatile oil had a wide molecular weight distribution (average molecular weight of 400 g/mol with species up to 1000 daltons).
Where [M.sup.n] is the average molecular weight and Mw is the weight-average molecular weight.
% of a polyhydroxyalkanoate with an average molecular weight of at least 20,000 g/mol.
The new Lupolen UHM 5000 polyethylene grade, with an average molecular weight of 5 million, is claimed to display strong wear resistance, a low coefficient of friction and stress crack resistance.
The number average molecular weight and weight average molecular weight of the PLA were determined by gel permeation chromatography (GPC) on a Waters 1515 HPLC system.
The EFSA opinion supports the following health claim for Barliv and other barley beta-glucans with average molecular weight between 100 and 2000 kDa: "Barley beta-glucans have been shown to lower/reduce blood cholesterol.
Average molecular weight data are usually not readily available (Veregin et al., 1996a,b) and, if available, are presented as number-average molecular weight points evaluated at a limited number of conversion levels (usually, low-medium-high conversion; see, e.g., MacLeod et al.

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