Cationic polymers are an interesting class of macromolecules due to their versatility and emerging properties that can be used for various industrial and biomedical purposes. This report is focused on investigating the use of microwave heating in the reversible addition–fragmentation chain transfer polymerization of functional cationic monomers, N‐(3‐aminopropyl)methacrylamide hydrochloride (APMA) and N‐[3‐(dimethylamino)propyl]methacrylamide (DMAPMA). Under comparable polymerization reaction conditions, the microwave‐assisted reaction achieves up to 270% (APMA) and 375% (DMAPMA) rate enhancement over conventional oil‐bath mediated set‐up. Linear relationships are observed between number average molecular weight and monomer conversion for different target degrees of polymerization to give low‐ to high‐molecular‐weight cationic polymers. Chain extension experiments show increase in molecular weight of the cationic polymers with narrow dispersities (Ð < 1.2) indicating retention of the chain transfer agent with no observable aminolysis or hydrolysis during polymerization.
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Maltodextrins have an increasing number of biomedical and industrial applications due to
their attractive physicochemical properties such as biodegradability and biocompatibility. Herein, we
describe the development of a synthetic pathway and characterization of thiol-responsive maltodextrin
conjugates with dithiomaleimide linkages. 19F NMR studies were also conducted to demonstrate the
exchange dynamics of the dithiomaleimide-functionalized sugar end groups.
Novel alkoxy ring-substituted tert-butyl phenylcyanoacrylates, RPhCH=C(CN)CO2C(CH3)3 (where R is 2-methoxy, 3-methoxy, 4-methoxy, 2-ethoxy, 3-ethoxy, 4-ethoxy, 4-propoxy, 4-butoxy) were prepared and copolymerized with styrene. The acrylates were synthesized by the piperidine catalyzed Knoevenagel condensation of ring-substituted benzaldehydes and tert-butyl cyanoacetate, and characterized by CHN analysis, IR, 1H and 13C NMR. All the acrylates were radically copolymerized with styrene in solution at 70C. The compositions of the copolymers were calculated from nitrogen analysis.
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