Dual physically and chemically cross-linked polyelectrolyte nanohydrogels: 
Compositional and pH-dependent behavior studies

Ashrafizadeh, Marjan; Tam, Kam Chiu; Javadi, Aliyar; Abdollahi, Mahdi; Sadeghnejad, Saeid; Bahramian, Alireza

doi:10.1016/j.eurpolymj.2019.109398

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Dual physically and chemically cross-linked polyelectrolyte nanohydrogels: Compositional and pH-dependent behavior studies

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Javadi, Aliyar
Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Ashrafizadeh, M., Tam, K. C., Javadi, A., Abdollahi, M., Sadeghnejad, S., & Bahramian, A. (2020). Dual physically and chemically cross-linked polyelectrolyte nanohydrogels: Compositional and pH-dependent behavior studies. European Polymer Journal, 122: 109398. doi:10.1016/j.eurpolymj.2019.109398.

Cite as: https://hdl.handle.net/21.11116/0000-0005-C4DC-6

Abstract

This study describes the composition-property relationship of a dual chemically and physically cross-linked nanohydrogel (NHG) containing a high concentration of hydrophilic pH-sensitive acrylic acid (AA). The physical and chemical cross-linking were incorporated using the aggregation of hydrophobic butyl acrylate (BA) and covalent bond of a bifunctional monomer (ethylene glycol dimethacrylate), respectively. Implementing a direct one-pot semi-batch emulsion polymerization technique in an acidic condition yielded monodispersed (PDI < 0.2) NHGs with a collapsed hydrodynamic radius of 60–100 nm. Titration studies revealed the significant effect of the chemical and physical cross-linking on the amounts of accessible carboxyl groups and their ionization behavior. These NHG dispersions displayed good colloidal stability over a wide pH and duration, the Donnan equilibrium is responsible for the observed swelling behavior of these NHGs.