Synthesis of cationic hyperbranched multiarm copolymer and its application in self-reducing and stabilizing gold nanoparticles

Abstract

A novel hyperbranched multiarm copolymer of HBPO-star-PDEAEMA with a hydrophobic poly(3-ethyl-3-(hydroxymethyl) oxetane) (HBPO) core and many cationic poly(2-(N,N-diethylamino)ethyl methacrylate) (PDEAEMA) arms has been synthesized through an atom transfer radical polymerization (ATRP) method, and been applied to spontaneously reduce and stabilize gold nanoparticles (AuNPs) in water without other additional agents. The size of the nanoparticles could be effectively controlled at about 4 nm, and the nanoparticles are extremely stable in solution without aggregation even for one year. It was found that solution pH and the molar ratio of N/Au have certain effects on the size and stability of AuNPs. This work provides a simple method for the synthesis of uniform and highly stable AuNPs.

Antifouling and antimicrobial polyethersulfone/hyperbranched polyester-amide/Ag composite

“…PESAM/Ag nanohybrid showed a sharp crystalline diffraction peak at 38 corresponding to (111) plane of AgNPs. 21 A broad non-crystalline peak (18)(19)(20)(21)(22)(23)(24)(25) was also recognized implying the amorphous nature of the hyperbranched polymer (Fig. 4).…”

“…Indeed, similar reducing potential was reported by Zhang et al who conrmed that nitrogen atom in the 1 , 2 and 3 amine of hyperbranched polymer can pass one of its lone pair of electron to Ag + leading to formation of zero-valent silver atoms that spontaneously aggregate together to form AgNPs (Scheme 1). 20,21 Actually, PESAM not only induced the in situ reduction of silver ions, but also stabilized the formed AgNPs due to the interactions of the hydroxyl and carbonyl groups with the metallic silver nanoparticles. Fig.…”

“…Mainly, besides its role as stabilizing agent, it acts as reductant due to the reducing power of tertiary amino groups which induced the in situ reduction of silver ions. 20 In this context, hyperbranched polyethylenimine and hyperbranched polyamidoamine have been reported for the in situ formation of antimicrobial colloidal silver nanoparticles. 21,22 In this work, hyperbranched polyester-amide (PESAM) based on phthalic anhydride and diisopropanolamine was evaluated as self-reducing and capping agent for in situ formation of AgNPs nanohybrid.…”

Focus on polymer chemistry papers in Science China Chemistry of the year 2010

“…For the drug release system, a great number of materials can be utilized such as supermolecule, block copolymers, hyperbranched polymers, etc. Yan et al synthesized a series of hyperbranched copolymers and explored their applications, especially in drug release [4,11,12].In their researches, two kinds of novel temperature-responsive hyperbranched multiarm copolymers were successfully synthesized via the atom transfer radical polymerization (ATRP). Poly(3-ethyl-3-(hydroxymethyl) oxetane) (HBPO) core and thermosensitive poly(N-isopropylacrylamide) (PNIPAM) arms were synthesized from NIPAM monomers by using a hyperbranched HBPO macroinitiator.…”

“…For the drug release system, a great number of materials can be utilized such as supermolecule, block copolymers, hyperbranched polymers, etc. Yan et al synthesized a series of hyperbranched copolymers and explored their applications, especially in drug release [4,11,12].…”