Search

The fractal analysis methodology allows the clear structural identification of both chemical and physical factors controlling a chain branching degree. The effective number of branching centers per one macromolecule m is controlled by four factors: polymer molecular weight, MW, maximal “chemical” density of reactive centers, cch, dimension of non-screening surface of macromolecular coil, du, and its fractal dimension, D. The presented research allows the determination of the critical value, Dcr = 1.10, the lower of which branching degree is equal to zero (i.e., branching does not occur)

The thermodynamic model of the nanoadhesion effect in polymer particulate-filled nanocomposites was considered, which was demonstrated a good correspondence to experimental data. It was shown that the nanoadhesion effect has dimensional origin, i.e. it is true nanoeffect. A nanofiller particles aggregation influences strongly on indicated effect.

A model of diffusion processes for chemical reactions is shown to describe well the main characteristics of a model reaction of reesterification. The structure of the reaction product (a heptylbenzoate molecule) and the formation of its parts are the main factors controlling the diffusion processes in this case. The processes are described within the framework of strange (anomalous) diffusion. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 [ABSTRACT FROM AUTHOR]

Physical aging of amorphous polymers was studied, and a theoretical description of the process in terms of fractal analysis was attempted. [ABSTRACT FROM AUTHOR]