Chain collapse and dynamics of inhomogeneities in aqueous solutions of poly( N -isopropylacrylamide) and its block copolymers with polyethylene glycol

Key Points

• This research aims to understand the chain collapse and dynamics in poly(N-isopropylacrylamide) solutions and its copolymers.
• Utilized spin probe EPR (Electron Paramagnetic Resonance) for analysis.
• Studied low molecular weight poly(N-isopropylacrylamide) and its polyethylene glycol copolymers.
• Evaluated the collapse temperature range and polarity of inhomogeneities.
• End groups and comonomers broaden the collapse temperature range.
• Inhomogeneities exhibited CHCl3-like polarity.
• Exchange probes were identified in the bulk solution.