Abstract
A series of tertiary amine-based hyperbranched poly(amine-ester)s have been synthesized by Michael addition polymerization of trifunctional monomer, TMEA and difunctional monomer, diacylates in chloroform, and the resultant polymers were subsequently treated with mercaptoethenol or 1-dodecanethiol for improving stability in storage. The caption efficiency of mercaptoethanol is much better than that of 1-dodecanthiol. Kinetic study reveals that the thiol group is consumed faster than the acrylate group when the polymerization with feed molar ratio of diacrylate/TMEA = 2/1 was carried out. At initial polymerization, monomer conversion increases fast, but the molecular weights increase slowly and sharp increase of the molecular weight occurs at the final polymerization. The hyperbranched polymers were well characterized by 1H NMR spectra and TD-SEC, and DBs of the polymers obtained are between 0.6 and 0.82, as well as the molar ratios of diacrylate/TMEA in the hyperbranched polymers are between 1.60 and 1.82. The fluorescence efficiency and quantum yields of HypET20, HypHT24 and HypDT24 has the following sequence: HypET20 > HypHT24 > HypDT24.
Highlights
Aliphatic tertiary amine-based polymers display interesting properties and have widely used as absorbents, catalysts, gene and drug carriers [1]
A series of tertiary amine-based hyperbranched poly(amine-ester)s have been synthesized by Michael addition polymerization of trifunctional monomer, TMEA and difunctional monomer, diacylates in chloroform, and the resultant polymers were subsequently treated with mercaptoethenol or 1-dodecanethiol for improving stability in storage
Poly(ester amine)s, which are prepared by Michael addition polymerization of diacrylate and trifunctional amines, are biodegradable, and have been widely used in gene delivery with high transfection efficiency, importantly, the results reveal no or low cytotoxicity [3]
Summary
Aliphatic tertiary amine-based polymers display interesting properties and have widely used as absorbents, catalysts, gene and drug carriers [1]. In the synthesis of tertiary amine-based hyperbranched polymers, a key monomer is TMEA, which was prepared from triethanolamine by transformation of the terminal hydroxyl to thiol group via three steps according to Scheme 2, but three reactions are fulfilled in one-pot, separation of the intermediates 1 and 2 is not needed.
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