Abstract
Chapter 8 does not presume to describe a variety of hyper-branched polymer (HBP) properties and examples of HBP application. This chapter is based on those studies and publications in which an interrelationship between the unique HBP properties and morphology and topology of HBP structure has been revealed. Special attention is given to industrially produced HBP—Boltorn® and Hybrane®. Problems to be solved in the near future have been formulated—theoretical problems plus analytical and synthetic concerns. Finding solutions to these problems would move us closer to the practical application of HBP. The progress associated with HBP application is so significant that one has grounds to assert that a revolution has occurred in polymeric material science.
As has been indicated earlier (Chap. 7), hyper-branched polymers (HBP) possess unique properties distinguishing them from polymers belonging to other classes. The unusual topological structure, the “core-shell” characterized by a very high local concentration of chain ends in the peripheral layer (shell) of macromolecules and a very high local concentration of branching points in the core, represents a source of these unique properties. As a result, the hydrodynamic volume of HBP macromolecules stops increasing after a certain degree of branching has been reached and, starting from a certain value Mn (usually starting from Mn > 104), the volume becomes significantly less than the hydrodynamic volume of linear macromolecules with the same value Mn. Such compact packing of HBP macromolecules and the large number of free chain ends at the periphery represent the primary structural and physical reasons for the manifestation of the unique HBP properties.
At the macroscopic level, the topological features of HBP are manifested as properties such as high solubility and thermodynamic compatibility, and high sorption capacity in combination with the ability to transport sorbates in those media in which the sorbate is insoluble (this ability allows using HBP as Ners with a high local concentration of reagents). All these properties appeared to be in demand in polymer material science, in medicine, in biology, in electronics, and in other fields of application. It should be pointed out that the HBP application efficiency was so high (improvement in properties by 100–200%!) that it led to a revolution in polymer material science.
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Korolev, G.V., Mogilevich, M.M. (2009). Properties and Application of Hyper-Branched Polymers. In: Three-Dimensional Free-Radical Polymerization. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-87567-3_8
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DOI: https://doi.org/10.1007/978-3-540-87567-3_8
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