ABSTRACT
A strategy for the synthesis of hyperbranched polymers with a degree of branching DB = 1 (“perfectly branched” hyperbranched polymers) based on AB2 monomers is proposed. It requires a monomer with 2 B-groups with coupled reactivity. The “criss-cross”-cycloaddition reaction between azines and unsaturated compounds was selected as suitable reaction, and consequently the synthesis of AB2 monomers based on aromatic aldazines with an unsaturated function as А-group was targeted. The preparation of 4-methoxy-4′-(3″-N-maleimidopropoxy)-benzaldazine was completed successfully. Molar mass determination of the resulting polymer indicated values for M¯n=5700 g⋅mol−1https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429070181/92ed2223-f350-4e45-aa72-60fdd8ba29b7/content/eq11.tif"/> by GPC with polystyrene calibration and M¯n=16700 g⋅mol−1https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429070181/92ed2223-f350-4e45-aa72-60fdd8ba29b7/content/eq12.tif"/> by GPC with light scattering detector. NMR spectroscopy did not show any defect structures (linear repeating units). MALDI-TOF mass spectroscopy was unsuccessful. No suitable matrix for laser desorption could be found up to now. Characterization of the physical properties is in progress.
