Two Robust Strategies toward Hydrogels from Quenched Block Copolymer Nanofibrillar Micelles

Kai Zhang, Aaditya Suratkar, Sitara Vedaraman, Vasudevan Lakshminarayanan, Laurence Jennings, Piotr J. Glazer, Jan H. Van Esch, Eduardo Mendes

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
20 Downloads (Pure)

Abstract

While the formation of (tri)block copolymer hydrogels has been extensively investigated, such studies mostly focused on equilibrium self-assembling whereas the use of preformed structures as building blocks such as out of equilibrium, quenched, nanofibrillar micelles is still a challenge. Here, we demonstrate that quenched, ultralong polystyrene-b-poly(ethylene oxide) (PS-b-PEO) micelles can be used as robust precursors of hydrogels. Two cross-linking strategies, (i) thermal fusion of micellar cores and (ii) chemical cross-linking of preformed micellar coronas were studied. The gelation process and the structure of the micellar networks were investigated by in situ rheological measurements, confocal microscopy and transmission electron microscopy. Direct observation of core fusion of preformed quenched micelles is provided validating this method as a robust gelation route. Using time sweep rheological experiments, it was found for both cross-linking methods that these 3D "mikado" gels are formed in three different stages, containing (1) initiation, (2) transition (growth), and (3) stabilization regimes.

Original languageEnglish
Pages (from-to)5788-5797
JournalMacromolecules
Volume51
Issue number15
DOIs
Publication statusPublished - 2018

Fingerprint Dive into the research topics of 'Two Robust Strategies toward Hydrogels from Quenched Block Copolymer Nanofibrillar Micelles'. Together they form a unique fingerprint.

Cite this