Thermoresponsive behaviour of terpolymers containing poly(ethylene oxide), poly(2-ethyl-2-oxazoline) and poly(ε-caprolactone) blocks in aqueous solutions: an NMR study
作者： Rafał Konefał , Jiří Spěváček , Eliezer Jäger , Svetlana Petrova , None
DOI: 10.1007/S00396-016-3930-7
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摘要: 1H NMR spectroscopy was used for the first time to investigate temperature behaviour of aqueous solutions nanoparticles (NPs) prepared from linear and Y-shape terpolymers containing blocks poly(ethylene oxide) (PEO), poly(2-ethyl-2-oxazoline) (PEtOx) one or two star poly(e-caprolactone) (PCL) with different length. Structural changes were characterized separately all in a range 295–360 K, broad transition observed at temperatures above ~320 K. The NPs depends on polymer concentration especially terpolymer architecture. At same time, measurements revealed important role PCL this behaviour. spin-spin relaxation times T 2 water (HDO) give information polymer-water interactions within aforementioned range. In copolymer, types detected higher temperatures: “free” “bound” molecules long very short values, respectively. For solution non-linear terpolymer, only highest (1.5 wt%) concentration.
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