4.4 Article

Multifaceted pH and Temperature Induced Self-Assembly of P(DMAEMA-co-LMA)-b-POEGMA Terpolymers and Their Cationic Analogues in Aqueous Media

Journal

MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 222, Issue 5, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.202000358

Keywords

amphiphilic block terpolymers; pH-responsive aggregates; random blocks; reversible addition-fragmentation chain transfer polymerization; solution self-assembly; temperature-responsive aggregates

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This work synthesized novel amphiphilic block terpolymers through reversible addition-fragmentation chain transfer polymerization, successfully creating block copolymers of poly[(2-(N,N-dimethylamino)ethyl methacrylate)-co-(lauryl methacrylate)]-b-poly[(oligo ethylene glycol)methyl ether methacrylate]. These copolymers exhibit pH and temperature responsiveness in aqueous solutions, forming nanoaggregates with varying size, micropolarity, and internal structure.
This work focuses on the synthesis of novel amphiphilic block terpolymers of the type poly[(2-(N,N-dimethylamino) ethyl methacrylate)-co-(lauryl methacrylate)]-b-poly[(oligo ethylene glycol) methyl ether methacrylate] (P(DMAEMA-co-LMA)-b-POEGMA)) by reversible addition-fragmentation chain transfer polymerization. The cationic amphiphilic polyelectrolyte analogs P(QDMAEMA-co-LMA)-b-POEGMA are obtained through quantitative quaternization of the DMAEMA segments. Molecular characterization by size exclusion chromatography, nuclear magnetic resonance, and Fourier Transform Infrared spectroscopies indicates the successful synthesis of these novel series of block terpolymers. The amine forms of the block copolymers respond to pH and temperature changes in aqueous solutions by forming unimolecular or multichain nanoaggregates of varying size, micropolarity, and internal structure, as indicated by light scattering and fluorescence spectroscopy techniques. At neutral and basic pH, the existence of micellar like nanoassemblies is observed in the solutions of P(DMAEMA-co-LMA)-b-POEGMA terpolymers, while aggregation into micellar-like clusters take place at temperature values above room temperature due to the presence of the hydrophobic LMA segments. Unexpectedly, the cationic polyelectrolytes P(QDMAEMA-co-LMA)-b-POEGMA counterparts show temperature responsiveness as a consequence of the amphiphilicity of the polymeric system.

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