NDLI: Temperature- and pH-responsive unimolecular micelles with a hydrophobic hyperbranched core

Content Provider	Springer Nature Link
Author	Luo, Shizhong Han, Mengcheng Cao, Yuehui Ling, Congxiang Zhang, Yuanyuan
Copyright Year	2011
Abstract	The dendritic unimolecular polymeric micelles with a hydrophobic dendritic polyester (Boltorn H40) as the core and the grafted biocompatible poly(N, N-diethylacrylamide)-b-poly(2-(dimethylamino)ethyl methacrylate) (PDEAAM-b-PDMAEMA) as the shell were synthesized by successive reversible addition–fragmentation transfer (RAFT) polymerization of N, N-diethylacrylamide (DEAAM) and 2-(dimethylamino)ethyl methacrylate (DMAEMA) monomers. Laser light scattering studies indicated that the resulting unimolecular polymeric micelles H40–PDEAAM–PDMAEMA with double stimuli-responsive shells exhibited a reversible two-stage phase transition behavior. The effect of varying the block length of PDMAEMA on the thermosensitivity of unimolecular polymeric micelles was studied. With an increase in the outer corona length of PDMAEMA, the temperature range of phase transition for the inner shell PDEAAM would become broad. As pH decreased to 2, the high hydrophilic PDMAEMA blocks with high protonation were independent of temperature, and the size of unimolecular polymeric micelles increased due to the extended-chain conformation of outer layer. The internal core cavities of the unimolecular polymeric micelles exhibited a great potential of loading guest molecules according to the analysis of pyrene probe fluorescence spectra.
Starting Page	1243
Ending Page	1251
Page Count	9
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	289
Issue Number	11
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-06-04
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Unimolecular polymeric micelle Core–shell structure Laser light scattering Thermoresponsive pH-responsive Characterization and Evaluation of Materials Soft and Granular Matter, Complex Fluids and Microfluidics Food Science Physical Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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