Thermoresponsive Polymer Ionic Liquids and Nanostructured Hydrogels Based upon Amphiphilic Polyisobutylene-b-poly(2-ethyl-2-oxazoline) Diblock Copolymers

Benjamin Kerscher, Tobias M. Trötschler, Balázs Pásztói, Saskia Gröer, Ákos Szabó, B. Iván, Rolf Mülhaupt

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The precise molecular engineering of amphiphilic diblock copolymers as thermoresponsive polymer ionic liquids (PILs) couples polyisobutylene (PIB) and poly(2-ethyl-2-oxazoline) (PEtOx) blocks via an imidazolium cation. It enables thermal switching of micellar self-assembly and yields nanostructured hydrogels. Just one ionic liquid (IL)-type imidazolium cation is readily incorporated into the backbone of the PIB-IL-PEtOx block copolymers by terminating the cationic 2-ethyl-2-oxazoline (EtOx) ring-opening polymerization by alkylation of an imidazole-terminated PIB. The PEtOx block length varies as a function of the PIB-imidazole/EtOx molar ratio and governs solubility, hydrophilic/hydrophobic balance, and nanophase separation. In spite of the presence of highly hydrophobic PIB segments, PIB-IL-PEtOx are rendered water soluble with increasing PEtOx block length and form spherical and elongated micelles as well as hydrogels exhibiting wormlike nanostructures. Furthermore, the lower critical solution temperature of PEtOx segments is the key to thermoresponsive behavior of both water-soluble copolymers and copolymer hydrogels. Owing to low glass temperature and high stability of PIB, these PIB-PILs represent attractive macromolecular nanosystems enabling thermal switching of solubilization, dispersion, transport, and shuttling of molecules and nanoparticles.

Original languageEnglish
Pages (from-to)3306-3318
Number of pages13
JournalMacromolecules
Volume52
Issue number9
DOIs
Publication statusPublished - May 14 2019

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Ionic Liquids
Hydrogels
Ionic liquids
Block copolymers
Polymers
Copolymers
Positive ions
Nanosystems
Ring opening polymerization
Alkylation
Cations
Micelles
Self assembly
Water
Nanostructures
Solubility
poly(2-ethyl-2-oxazoline)
polyisobutylene
Nanoparticles
Glass

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Thermoresponsive Polymer Ionic Liquids and Nanostructured Hydrogels Based upon Amphiphilic Polyisobutylene-b-poly(2-ethyl-2-oxazoline) Diblock Copolymers. / Kerscher, Benjamin; Trötschler, Tobias M.; Pásztói, Balázs; Gröer, Saskia; Szabó, Ákos; Iván, B.; Mülhaupt, Rolf.

In: Macromolecules, Vol. 52, No. 9, 14.05.2019, p. 3306-3318.

Research output: Contribution to journalArticle

Kerscher, Benjamin ; Trötschler, Tobias M. ; Pásztói, Balázs ; Gröer, Saskia ; Szabó, Ákos ; Iván, B. ; Mülhaupt, Rolf. / Thermoresponsive Polymer Ionic Liquids and Nanostructured Hydrogels Based upon Amphiphilic Polyisobutylene-b-poly(2-ethyl-2-oxazoline) Diblock Copolymers. In: Macromolecules. 2019 ; Vol. 52, No. 9. pp. 3306-3318.
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