SYNTHESIS OF NEW BLOCK COPOLYMERS BASED ON POLYETHYLENGLYCOL AND 2-OXAZOLINES
Abstract
New block copolymers (typ AB) were obtained by the ring opening cationic polymerization of
2-cyclopropyl- and 2-methoxycarbonylethyl-2-oxazoline, using tosylated polyethylenglycol
as initiator. In block copolymers, the polymerization grade of polyethylenglycol (PEG)
segment was always 45 units and of the poly(2-oxazolines) segment was variable, between
33 to 242 units. The block copolymers, containing 2-methoxycarbonylethyl-2-oxazoline,
were submitted to a quantitative hydrólisis of ester groups to obtain carboxylic acid units.
The copolymers were characterized structurally by nuclear magnetic resonance spectroscopy
and they show a conformational transition (LCST) between 24 and 48°C, which was function
of the polymer structure, of its content of cyclopropyloxazoline and carboxilic acid groups.
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