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Synthesis and Characterization of Novel pH‐Responsive Polyampholyte Microgels
Author(s) -
Tan Beng Hoon,
Ravi Palaniswamy,
Tam Kam Chiu
Publication year - 2006
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.200500830
Subject(s) - steric effects , hydrodynamic radius , methacrylate , methacrylic acid , dynamic light scattering , polymer chemistry , ethylene glycol , isoelectric point , aqueous solution , static light scattering , materials science , chemistry , polymer , organic chemistry , copolymer , nanotechnology , nanoparticle , enzyme
Summary: We synthesized for the first time novel pH‐responsive polyampholyte microgels consisting of poly(methacrylic acid) and poly(2‐(diethylamino)ethyl methacrylate) (PMAA‐PDEA) that are sterically stabilized with poly(ethylene glycol) methyl ether methacrylate (PEGMEM). These microgels showed enhanced hydrophilic behavior in aqueous medium at low and high pH but become hydrophobic and compact between pH 4 and 6 near the isoelectric point. Dynamic‐light scattering measurements showed that the hydrodynamic radius, R h of these microgels is approximately 100 nm between pH 4 and 6 and increases to around 140 and 170 nm at pH 2 and 10, respectively. It is evident that the cross‐linked MAA‐DEA microgel that is sterically stabilized with PEGMEM retains the polyampholyte properties in solution.Sterically stabilized cross‐linked MAA‐DEA microgel.