Abstract
The phase transitions in water of well-defined copolymers of 2-(2-methoxyethoxy)ethyl methacrylate (MEO2MA) and oligo(ethylene glycol) methacrylate (OEGMA, Mn = 475 g mol-1) were studied by means of 1H NMR, dynamic light scattering (DLS) and turbidimetry. These copolymers were synthesized by atom transfer radical polymerization (ATRP) in order to obtain macromolecules with a homogeneous chain-to-chain comonomer composition and therefore with a narrow phase transition. As previously reported, copolymers containing 10 mol % of OEGMA per chain (Mn = 20 100 g mol-1 ; Mw/Mn = 1.35) exhibited a sharp LCST in water around 40 °C, whereas copolymers having 20 mol % of OEGMA per chain (Mn = 19 500 g mol-1; Mw/Mn = 1.32) precipitated slightly above 50 °C. DLS indicated that these phase transitions are most likely due to a reversible coil-to-globule transition. Moreover covalently cross-linked networks of MEO2MA and OEGMA were synthesized by ATRP in the presence of the cross-linker ethylene glycol dimethacrylate. The...
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