Influence of the Growing Flexible Shell on the Molecular Behavior of Hybrid Dendrimers
Sergey A. Milenin, Georgy V. Cherkaev, Н. В. Демченко, Elena S. Serkova, I. Yu. Krasnova, Elizaveta V. Selezneva, Mikhail I. Buzin, Artem V. Bakirov, В. Г. Васильев, Zinaida B. Shifrina, С. Н. Чвалун, Aziz M. Muzafarov
Abstract
A versatile approach to the synthesis of hybrid dendrimers composed of a rigid aromatic core and a flexible carbosilane shell is proposed. For this, carbosilane monodendrons of the first, second, and third generations were linked to a Muellen-type polyphenylene dendrimer via the copper-catalyzed azide–alkyne cycloaddition reaction. A series of hybrid dendrimers with a fixed phenylene core size and various carbosilane peripheries were synthesized to clarify the influence of a growing flexible shell on thermal and rheological dendrimer properties. Small-angle X-ray scattering experiments and density functional theory calculations revealed that the dendrimers form a columnar phase with hexagonal (G1, G2) and orthorhombic (G3) types of packing.