polydispersity

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polydispersity

[¦päl·i·di′spər·səd·ē]
(chemistry)
Molecular-weight nonhomogeneity in a polymer system; that is, there is some molecular-weight distribution throughout the body of the polymer.
References in periodicals archive ?
On the other hand, the polydispersity index of PLA from kenaf biomass indicates that the catalyst did not influence the broadness of molecular weight distribution (Figure 3).
n], the conversion of monomers attained in the reactor and the polydispersity index.
However, the MWD of the polymer produced with this technology is very narrow, the polydispersity index being less than two, thus confirming the pseudo living evolution of the polymerization.
3, we can see that the number of peaks and the polydispersity index of B are the smallest and that of A are the second, and the diameter distributions of C and D are wider than A and B.
7 156 900 Sample Weight average molecular Polydispersity index (PDI) weight ([M.
1]H NMR nuclear magnetic resonance spectroscopy MSA 2-methylsuccinate acid PBMS Polyfbutylene 2-methylsuccinate) PDI polydispersity index PVC polyfvinyl chloride) TBT tetrabutyl titanate TGA thermogravimetric analysis [T.
The molecular weight and polydispersity index were analyzed by size exclusion chromatography using a Perkin Elmer chromatograph equipped with a binary pump and a refractive index detector.
In addition, the width of the molecular weight distribution is characterized by the polydispersity index (PDI) which is defined by [M.
n]) and polydispersity index (PDI) of the prepared HP were determined by gel permeation chromatography [Agilent 1100 series, Germany] using linear polystyrene as a standard for calibration, and N, N-dimethylformamide (DMF) as the eluent at a flow rate of 1 ml [min.
weight average molecular weight (Mw), and polydispersity index (PDI) of the polymer were determined by GPC using polystyrene standards.
The theoretical molecular weight is 7300 g/mol and the polydispersity index is 1.
Molecular weights (Mn) and polydispersity index (PDI) of the macroinitiator p(DMAEMA-SC(S)Ph) and the diblock copolymer p(DMAEMAm-b-AZOMn) are determined by GPC.