Influence of branching regularity on the behavior of hyperbranched polymers in solution |
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| Authors: | Alexander Filippov Alina I Amirova Tatiana Kirila Elena V Belyaeva Natalia A Sheremetyeva Aziz M Muzafarov |
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| Affiliation: | 1. Institute of Macromolecular Compounds of Russian Academy of Sciences, Laboratory of Molecular Physics of Polymers, Saint Petersburg, Russian Federation;2. Institute of Synthetic Polymeric Materials, Laboratory of Organoelement Synthesis, Moscow, Russian Federation |
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| Abstract: | A carbosilane pseudo‐dendrimer with irregular structure and degree of branching DB = 1 was synthesized and fractionated. The molar masses of the obtained fractions ranged from 5000 to 490 000 g mol?1. The hydrodynamic and conformational properties were studied by the methods of light scattering, sedimentation‐diffusion analysis and viscometry in dilute hexane and toluene solutions. The Mark ? Kuhn ? Houwink dependences were obtained. The results for the pseudo‐dendrimer are compared with the data for the initial hyperbranched poly(diallylcarbosilane) with DB = 0.5 and carbosilane dendrimer. It is shown that the solution properties of the pseudo‐dendrimer are close to those for the irregular hyperbranched polymer and differ significantly from the dendrimer behavior. Hence, it is branching regularity rather than the degree of branching that determines the conformational and hydrodynamic properties of hyperbranched polymers with a high degree of branching DB ≥ 0.5. © 2014 Society of Chemical Industry |
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| Keywords: | pseudo‐dendrimer polycarbosilanes hydrodynamic and conformational properties degree of branching branching regularity |
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