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Functional Brush Poly(2‐ethyl‐2‐oxazine)s: Synthesis by CROP and RAFT, Thermoresponsiveness and Grafting onto Iron Oxide Nanoparticles
Author(s) -
Klein Tobias,
Parkin Joshua,
Jongh Patrick A. J. M.,
Esser Lars,
Sepehrizadeh Tara,
Zheng Gang,
Veer Michael,
Alt Karen,
Hagemeyer Christoph E.,
Haddleton David M.,
Davis Thomas P.,
Thelakkat Mukundan,
Kempe Kristian
Publication year - 2019
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201800911
Subject(s) - lower critical solution temperature , materials science , raft , polymer chemistry , nanoparticle , polymer , chain transfer , polymerization , grafting , reversible addition−fragmentation chain transfer polymerization , chemical engineering , iron oxide nanoparticles , methacrylate , functional polymers , cationic polymerization , chemistry , radical polymerization , nanotechnology , copolymer , composite material , engineering
Abstract Brush polymers are highly functional polymeric materials combining the properties of different polymer classes and have found numerous applications, for example, in nanomedicine. Here, the synthesis of functional phosphonate‐ester‐bearing brush polymers based on poly(2‐oxazine)s is reported through a combination of cationic ring‐opening polymerization (CROP) of 2‐ethyl‐2‐oxazine and reversible addition‐fragmentation chain transfer (RAFT) polymerization. In this way, a small library of well‐defined (Đ ≤ 1.17) poly(oligo(2‐ethyl‐2‐oxazine) methacrylate) P(OEtOzMA) n brushes with tunable lower critical solution temperature (LCST) behavior and negligible cell toxicity is prepared. Upon deprotection, the phosphonic acid end‐group of the P(OEtOzMA) n brush enables the successful grafting‐onto iron oxide nanoparticles (IONPs). Colloidal stability of the particle suspension in combination with suitable magnetic resonance imaging (MRI) relaxivities demonstrates the potential of these particles for future applications as negative MRI contrast agents.