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THE DEPENDENCE OF THE CHAIN BRANCHING DEGREE ON MOLECULAR WEIGHT: FRACTAL ANALYSIS

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Author(s): G. V. KOZLOV | A. I. BURYA | G. B. SHUSTOV

Journal: Chemical Industry and Chemical Engineering Quarterly
ISSN 1451-9372

Volume: 14;
Issue: 3;
Start page: 181;
Date: 2008;
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Keywords: polyhydroxyether | branching | structure | non-screening surface critical dimension.

ABSTRACT
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)
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