Polydispersive material

In order to enhance the understanding of the properties in polymers, iterative pathways have been chosen for the synthesis of structurally perfect molecules. Data obtained from the analysis of precisely defined oligomers and polymers may relate chain length and conformation to physical, electronic and optical properties. Statistical polymerization processes are not suitable as they yield polydisperse material. 

Once the amounts and molecular weights of the fractions have been determined, the molecular-weight distribution of a polydisperse material can be expressed graphically in the form of a distribution curve. The mass distribution function is written as ... 

In the case of entangled polydisperse materials (Mw Mc), the zero-shear viscosity follows approximately the same molecular weight dependence as for monodisperse species when the viscosity data is plotted as a function of the weight-average molecular weight M i.e. ... 

A further difficulty in attempting meniscus-depletion conditions with polydisperse materials is that the effective, thermodynamic, second vitial coefficient, Bej, can be greatly enhanced ... 

Restricted particie size and size distribution polydisperse materials cause excessive entrainment, while both fine and coarse materials do not fluidize well... 

Stability of Polydimethylsiloxane-Magnetite Nanoparticle Dispersions Against Flocculation Interparticle Interactions of Polydisperse Materials. Langmuir 2008,24(5060-5069), 1489-1494. 

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