Poly(N-isopropylacrylamide) (PNIPAM)-based tetrafunctional atom transfer radical polymerization (ATRP)
macroinitiator (1b) was synthesized via addition reaction of mono-amino-terminated PNIPAM (1a) with glycidol,
followed by esterification with excess 2-bromoisobutyryl bromide. Well-defined double hydrophilic miktoarm AB4
star copolymer, PNIPAM-b-(PDEA)4, was then synthesized by polymerizing 2-(diethylamino)ethyl methacrylate
(DEA) via ATRP in 2-propanol at 45 °C using 1b, where PDEA was poly(2-(diethylamino)ethyl methacrylate). For
comparison, PNIPAM-b-PDEA linear diblock copolymer with comparable molecular weight and composition to that
of PNIPAM-b-(PDEA)4 was prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization.
The pH- and thermoresponsive schizophrenic micellization behavior of the obtainedPNIPAM65-b-(PDEA63)4 miktoarm
star and PNIPAM70-b-PDEA260 linear diblock copolymers were investigated by 1H NMR and laser light scattering
(LLS). In acidic solution and elevated temperatures, PNIPAM-core micelles were formed 快速动力学停流装置与光谱分析系统
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