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- W2969447142 abstract "Dual thermo- and pH-sensitive network-grafted hydrogels made of poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) network and poly(N-isopropylacrylamide) (PNIPAM) grafting chains were successfully synthesized by the combination of atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer (RAFT) polymerization, and click chemistry. PNIPAM having two azide groups at one chain end [PNIPAM-(N₃)₂] was prepared with an azide-capped ATRP initiator of N,N-di(β-azidoethyl) 2-chloropropionylamide. Alkyne-pending poly(N,N-dimethylaminoethyl methacrylate-co-propargyl acrylate) [P(DMAEMA-co-ProA)] was obtained through RAFT copolymerization using dibenzyltrithiocarbonate as chain transfer agent. The subsequent click reaction led to the formation of the network-grafted hydrogels. The influences of the chemical composition of P(DMAEMA-co-ProA) on the properties of the hydrogels were investigated in terms of morphology and swelling/deswelling kinetics. The dual stimulus-sensitive hydrogels exhibited fast response, high swelling ratio, and reproducible swelling/deswelling cycles under different temperatures and pH values. The uptake and release of ceftriaxone sodium by these hydrogels showed both thermal and pH dependence, suggesting the feasibility of these hydrogels as thermo- and pH-dependent drug release devices." @default.
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- W2969447142 date "2011-01-01" @default.
- W2969447142 modified "2023-09-24" @default.
- W2969447142 title "Dual thermo- and pH-sensitive network-grafted hydrogels formed by macrocrosslinker as drug delivery system Part A Polymer chemistry" @default.
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