Influence of core configuration and arm structure on solution properties of new thermosensitive star-shaped poly(2-alkyl-2-oxazolines)

New thermoresponsive star-shaped poly(2-isopropyl-2-oxazoline) (PiPrOx) and poly(2-ethyl-2-oxazoline) (PEtOx) with arm grafting to upper rim of calix[8]arene core were synthesized and studied in aqueous solutions by light scattering and turbidimetry methods. The solution behavior was compared with t...

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Published inInternational journal of polymer analysis & characterization Vol. 23; no. 3; pp. 278 - 285
Main Authors Amirova, Alina, Tobolina, Anastasiya, Kirila, Tatyana, Blokhin, Alexey, Razina, Alla, Tenkovtsev, Andrey, Filippov, Alexander
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 03.04.2018
Taylor & Francis Ltd
Subjects
Aqueous solutions
Calixarenes
Chemical synthesis
Configurations
Dehydration
Grafting
Phase separation
poly(2-alkyl-2-oxazolines)
Polymers
star-shaped macromolecules
thermosensitive polymers
Turbidimetry
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Summary:New thermoresponsive star-shaped poly(2-isopropyl-2-oxazoline) (PiPrOx) and poly(2-ethyl-2-oxazoline) (PEtOx) with arm grafting to upper rim of calix[8]arene core were synthesized and studied in aqueous solutions by light scattering and turbidimetry methods. The solution behavior was compared with that for polyoxazoline stars with varying positions of arm grafting, i.e., to lower rim of calix[8]arene. The observed growth of the phase separation temperature for PiPrOx as compared to PEtOx is explained by different dehydration temperatures of ethyl- and isopropyloxazoline units. The phase separation temperatures decrease after the changeover from lower rim grafting to upper rim one due to varying configurations of calix[8]arene.
ISSN:1023-666X
1563-5341
DOI:10.1080/1023666X.2018.1441483