Synthesis of Star-Shaped Polymers Based on 2-ALKYL-2-Oxazoline with a Calix[8]Arene Central Core and the Study of Their Heat-Sensitive Properties

• Published in: Fibre chemistry Vol. 47; no. 4; pp. 291 - 297
• Main Authors: Kurlykin, M. P., Bursian, A. E., Dudkina, M. M., Ten’kovtsev, A. V.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-11-2015; Springer
• Subjects: Block copolymers; Chemistry; Chemistry and Materials Science; Organic Chemistry; Polymer Sciences; Lower Critical Solution Temperature; Block Copolymer; Cloud Point; Molecular Weight Distribution; Acid Ethyl Ester
• ISSN: 0015-0541; 1573-8493
• DOI: 10.1007/s10692-016-9681-x

This work describes the synthesis of thermosensitive eight-point star-shaped polymers with a central core comprised of residual octa-ester-tert-butylcalix[8]arene with oligo-2-ethyl-2-oxazoline-block-2-isopropyl-2-oxazoline rays. It is found that, despite the presence of two blocks with substantially different temperatures of the coil – globule transition, block copolymers exhibit only one lower critical solution temperature (LCST), and the phase transition is observed at a temperature close to the transition temperature of the homopolymer with a lower LCST. For the first time it is found that, upon incubating for some time in an aqueous solution above the LCST, star polymers with temperature-sensitive polyoxazoline rays self-assemble to form nanofibers and structures with more complex morphology.