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Liu, Fangyao; Seuring, Jan; Agarwal, Seema
Polymer chemistry, 01/2013, Volume: 4, Issue: 1Journal Article
Atom transfer radical polymerization (ATRP) of N -acryloylglycinamide has been used as a tool to make poly(NAGA) showing UCST-type phase transitions in water and electrolytes independent of molar mass and end-groups. We hypothesized that similarity in the structure of polymer chain ends with the repeat unit of poly(NAGA) could help in eliminating the effect of molar mass dependence of the cloud point especially in the low molar mass region. The monomer-like end-groups were introduced by choosing an appropriate initiator for ATRP like chloropropionamide (CPA). The catalyst system CuCl/CuCl 2 and tris2-(dimethylamino)ethyl-amine (Me 6 TREN) as a ligand provided controlled polymerization of NAGA in DMSO at 45 °C with UCST-type transitions retained in water and electrolytes without being influenced by chain ends/molar mass and high concentration of salts like NaCl and Na 2 SO 4 . ATRP has been used as a tool to provide poly( N -acryloylglycinamide) with UCST-type transitions in water and electrolytes independent of molar mass and chain ends.
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