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Synthesis and Characterization of Cationic Dendrimer‐PDMS Hybrids
Author(s) -
Marks Monica A.,
Kalaitzidou Kyriaki,
Gutekunst Will R.
Publication year - 2021
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000652
Subject(s) - dendrimer , cationic polymerization , polymer chemistry , alkyl , polydimethylsiloxane , materials science , polymer , click chemistry , silicone , genipin , chemistry , chemical engineering , organic chemistry , chitosan , engineering
A modular strategy for the synthesis of dendron‐linear polymer hybrids comprised of a flexible polydimethylsiloxane (PDMS) midblock with cationic 2,2‐bis(hydroxymethyl)propionic acid (bis‐MPA) dendron end groups is developed. The invention of a scalable methodology to access quaternary ammonium carboxylate building blocks and their direct use in esterification chemistry enables rapid access to cationic bis‐MPA dendrons. The convergent click coupling of highly charged dendrons to hydrophobic PDMS chain‐ends gives a 12‐membered family of hybrids that are comprised of different dendron generations (G1–3) and quaternary ammonium alkyl chain lengths (C 4 , C 8 , C 12 , C 16 ). This provides a library of materials with variable hydrophobicity, charge density, and chain‐end valency. The physical behavior of the dendron‐linear PDMS hybrid copolymers significantly changes after introduction of the cationic dendron end‐groups and leads to soft‐solid materials as a result of inhibited chain mobility. These PDMS‐dendron hybrids are expected to behave as surface‐active antimicrobial additives in bulk cross‐linked silicone systems.