Synthesis and physical behavior of amphiphilic dendrimers with layered organization of hydrophilic and hydrophobic blocks
- 374 Downloads
Amphiphilic carbosilane dendrimers with novel architectural layout have been synthesized. These dendrimers contain peripheral groups consisting of covalently bound promesogenic fragments and hydrophilic (oligoethyleneglycolic) linkages which are connected to a carbosilane core in two distinct ways: as spacer or as tail arrangement. Such molecules have a block structure where the hydrophilic and hydrophobic blocks are distributed within the dendrimer forming layers of different polarity. The hydrophilic layer is either enclosed between two hydrophobic parts of the molecule or is situated on the periphery. The synthetic strategy for achieving these structures is described. The interfacial properties of the dendrimers were studied and the influence of the dendritic structure’s organization on the Langmuir film formation process is assessed.
KeywordsDendrimer Amphiphilic Langmuir Blodgett Thin films
This research was supported by the Russian Foundation of Fundamental Researches, COST action D35-WG0013. We also appreciate the help of Dr. Elena Agina, Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, with BAM experiments. Authors thank Prof. Stephen Roser for helpful discussions, Dmitry Eliseev for initial contribution to the synthetic work and Dr. Anatoly Kaznacheev for his help with low temperature POM. Authors are especially grateful to Center for Advanced Materials, University of Massachusetts Lowell for providing research support.
- 1.Tully DC, Fréchet JMJ (2001) Dendrimers at surfaces and interfaces: chemistry and applications. Chem Commun 1229–1239Google Scholar
- 25.Muzafarov AM, Gorbatsevich OB, Rebrov EA, Chenskaya TB, Miakushev VD, Bulkin AF, Papkov VS (1993) Polym Sci Ser A (Vysokomol Soedin A) 35:1867–1872Google Scholar
- 28.Ponomarenko SA, Agina EV, Boiko NI, Rebrov EA, Muzafarov AM, Richardson RM, Shibaev VP (2000) Liquid crystalline carbosilane dendrimers with terminal phenyl benzoate mesogenic groups: influence of generation number on phase behavior. Mol Cryst Liq Cryst, 2001, 364:93–101Google Scholar