NDLI: Doubly thermo-responsive ABC triblock copolymer nanoparticles prepared through dispersion RAFT polymerization

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Wangqing Huo, Fei Li, Quanlong Gao, Chengqiang Li, Shentong
Copyright Year	2014
Abstract	Doubly thermo-responsive triblock copolymer nanoparticles of poly(N-isopropylacrylamide)-block-poly[N,N-(dimethylamino) ethyl methacrylate]-block-polystyrene (PNIPAM-b-PDMAEMA-b-PS) and PDMAEMA-b-PNIPAM-b-PS containing two thermo-responsive blocks of poly(N-isopropylacrylamide) (PNIPAM) and poly[N,N-(dimethylamino) ethyl methacrylate] (PDMAEMA) are prepared by a macro-RAFT agent mediated dispersion polymerization through a polymerization-induced self-assembly. The RAFT polymerization undergoes an initial slow homogeneous polymerization and then a fast heterogeneous one. During the dispersion RAFT polymerization, the molecular weight of the synthesized triblock copolymer increases linearly with the monomer conversion, and the average diameter of the in situ synthesized triblock copolymer nanoparticles increases with the triblock copolymer molecular weight. The triblock copolymer nanoparticles exhibit two separate lower critical solution temperatures (LCST), corresponding to the PNIPAM block and the PDMAEMA block in water, and this two-step thermo-responsive behavior is evidenced by combined techniques, including turbidity analysis, variable temperature 1H NMR analysis, DLS analysis and TEM observations. It is found that the first LCST corresponding to the PNIPAM block and the second LCST corresponding to the PDMAEMA block tethered on the polystyrene core of the triblock copolymer nanoparticles are much higher than those of the reference homopolymers, and the reason for this is ascribed to the steric repulsion and the strong interaction between the PNIPAM and PDMAEMA blocks. Besides, the difference in the thermo-responsive behavior of the triblock copolymer nanoparticles of PNIPAM-b-PDMAEMA-b-PS and PDMAEMA-b-PNIPAM-b-PS ascribed to the different block order is demonstrated.
Starting Page	2961
Ending Page	2972
Page Count	12
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	5
Issue Number	8
Journal	Polymer Chemistry
DOI	10.1039/c3py01699d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Statistical dispersion Self-assembly Transmission electron microscopy Poly(N-isopropylacrylamide) Dynamic light scattering Turbidity Polymerization Copolymer Nuclear magnetic resonance Monomer Polystyrene
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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