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 ?
Additionally, due to such poor thermal stability, PLA from kenaf biomass has low molecular weight and polydispersity index (PD).
Firstly, we compared two synthesis methods each other depending reaction times, weight average molecular weight (M w ), polydispersity index (PDI), hydrodynamic radius (Rh), intrinsic viscosity ([e]) and Mark Houwink equation constant (a) of copolymers.
The formulation, molecular weight, and polydispersity index of epoxides used in this study are given in Table 9.
The mean particle size, polydispersity index and zeta potential of the nanoparticles were assessed by dynamic light scattering (DLS) (ZetaSizer Nano-ZS; Malvern Instruments Ltd.
The polydispersity index (Mw/Mn) of the poly(TBPMA-co-GMA) and poly(PBPMA-co-GMA) were 2.
The investigated samples were two experimental SEBS triblock copolymers synthesized by Repsol-YPF, both of which have a polydispersity index of 1.
Therefore, during the PVAc hydrolysis, one may expect the formation of larger polymer chains through branching, lower polymer chains through hydrolysis, cleavage, and as a consequence, increase of the polydispersity index ([M.
the particle size, polydispersity index, viscosity, and surface tension, for PU-D aqueous dispersions are similar to and/or even better than those for PU-E aqueous dispersions.
Dirany et al" for example, produced hydroxyl-terminated polystyrene (PS-OH) with low polydispersity index (lower than 1.
The polyester polyols were synthesized and the general polymeric properties, including the acid value, the hydroxyl value, the average molecular weight, the polydispersity index and the viscosity, were evaluated.
The polydispersity index which is equal to five for the polymerization without the CTA is decreased to 2.