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Clausnitzer, C. ; Komber, H. ; Voit, B.
Poly(ether amide) Dendrimers via Nuckleophilic Ring-Opening Addition Reactions of Phenol Groups towards Oxazolines: Synthesis and Characterization

The synthesis of aliphatic-aromatic poly(ether amide) dendrimers via ring-opening additionreaction of phenol groups toward oxazoline up to generation 3 is presented. The first and second generationcould be prepared both by convergent and divergent approaches. The ring-opening addition reaction wascarried out in bulk at temperatures between 140 and 190 C, followed by hydrogenation of the protectingbenzyl ether units with palladium catalyst. The dendrons and dendrimers were characterized by 1H and13C NMR spectroscopy, MALDI-TOF MS, SEC, and DSC. The synthetic scheme applied allowed to prepareperfect dendrimers having identical structure and end groups as previously described hyperbranchedpolymers which enabled a direct comparison of the properties. Melt rheology measurements on thedendrimers revealed a predominantly elastic behavior with a relatively high viscosity at low frequency,as was found also for the hyperbranched analogues. The second generation of one of the poly(ether amide)dendrimers was mixed with linear polyamide 6 (PA6) in melt up to an amount of 1 wt % in order toevaluate the influence of dendrimers on the properties of the matrix. The dendrimer was fully misciblewith the matrix, but in contrast to the hyperbranched polymers of higher molar mass, it had no influenceon the melt rheological behavior of the PA6.

Source
Macromolecules 36

Pages
7065-7074

DOI
http://dx.doi.org/10.1021/ma034318y

Published
October 2003
 
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