Synthesis and Properties of Carboxylated Dendritic Polyamide-b-Poly(4-vinylpyridine) Block Copolymers Capable of Multiple Hydrogen Bonding

Abstract

A dendritic aromatic polyamide having carboxyl groups on the periphery and a benzyl chloride group at the core (Cl-G1-4COOH) was prepared as an initiator for atom transfer radical polymerization (ATRP). The ATRP of 4-vinylpyridine initiated by Cl-G1-4COOH was carried out in the presence of tris[2-(dimethylamino)ethyl]amine (Me₆ TREN) and CuCl to form tadpole-shaped dendritic-linear copolymers (P4VP-G1-4COOH). The structure of P4VP-G1-4COOH was confirmed by nuclear magnetic resonance (NMR) and infrared measurements. The thermal and solution properties of P4VP-G1-4COOH are influenced by the multiple hydrogen bonding between the carboxyl groups on the periphery and vinylpyridine segments. A glass transition temperature value that is higher than that of Cl-G1-4COOH could be due to the contribution of the multiple hydrogen bonding. The decreased solubility in methanol and chloroform suggests the presence of the multiple hydrogen bonding. The solubility of each component also affected the association of P4VP-G1-4COOH in solution. A structural model for the molecular interaction of P4VP-G1-4COOH in methanol, chloroform and N,N-dimethylformamide based on the hydrodynamic radii and NMR measurements is proposed..

Keywords

Dendritic initiator dendritic-linear copolymer multiple hydrogen bonding

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