Synthesis and characterization of poly(ether amide) dendrimers containing different core molecules

The synthesis of novel poly(ether amide) dendrimers containing different symmetrical benzenetriamides as core molecules is presented. The synthesis was carried out in a stepwise convergent manner to build up poly(ether amide) dendrons where 5-(2-aminoethoxy)isophthalic acid is the branching repeating unit. Three defined dendrons were subsequently attached to a central core. For this key reaction step O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate (TBTU) was preferably used as activating agent to form the desired amide groups. H-1/C-13 NMR spectroscopy, MALDI-TOF-MS, SEC, and DSC were used to characterize the obtained dendrimers. The incorporated central units had a remarkable influence on the glass transition temperatures (T-g) within the series of dendrimers.