Abstract
Detailed investigation of the LCST phase separation mechanism of poly(ethylene alkyl phosphonate)- copolymers is presented.
Highlights
Responsive materials, that are substances showing a property change upon an external stimulus, are of interest for a variety of applications
Monomer synthesis To generate a library of temperature-responsive poly(ethylene alkyl phosphonate)s, three different five-membered cyclic phosphonates for anionic ring-opening polymerization (AROP) were synthesized (Scheme 2a)
We studied the hydrophilic-to-hydrophobic phase transition of thermo-responsive aliphatic poly( phosphonate)s on different length scales: the nanometer-sized regime was studied by CW electron paramagnetic resonance spectroscopy (EPR) spectroscopy, revealing two types of water: first, bulk water with the freely tumbling hydrophilic probe and second, polymer-associated water that forms the hydration shell around the polymer chains where the more hydrophobic probe species with a reduced environmental polarity is located
Summary
Responsive materials, that are substances showing a property change upon an external stimulus, are of interest for a variety of applications. Formation of nano-inhomogeneities and microscopic aggregates close to the cloud point temperature (Tcp) observed via CW EPR and DLS measurements, respectively.
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