Polyacrylamide-Based Block Copolymer Bearing Pyridine Groups Shows Unexpected Salt-Induced LCST Behavior

Polyacrylamide-Based Block Copolymer Bearing Pyridine Groups Shows Unexpected Salt-Induced LCST Behavior

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Thermal-responsive block copolymers are a special type of macromolecule that exhibit a wide range of applications in various fields.In this contribution, we report a new type of polyacrylamide-based block copolymer bearing pyridine groups of polyethylene glycol-block-poly(N-(2-methylpyridine)-acrylamide; click here Px) that display distinct salt-induced lower critical solution temperature (LCST) behavior.Unexpectedly, the phase-transition mechanism of the salt-induced LCST behavior of Px block copolymers is different from that of the reported LCST-featured analogues.Moreover, their thermo-responsive behavior can be significantly regulated by several parameters such as salt species and concentration, urea, polymerization degree, polymer concentration and pH values.This unique thermal behavior of pyridine-containing block copolymers provides a custom congratulations banner new avenue for the fabrication of smart polymer materials with potential applications in biomedicine.