Melt-Fabricated Photoreactive Block Copolymer Micelles as Building Blocks for Tunable Elastomeric Hydrogels

Nabila A. Huq, René P.M. Lafleur, Travis S. Bailey (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Soft, conformally shaped thermoplastic elastomer (TPE) hydrogels producible from a moldable precursor material are desirable in many biomedical, surgical, and pharmaceutical applications. An innovative class of hydrogel networks was developed by employing photocurable, moldable solutions of melt-assembled spherical micelles formed from ω-anthracenylpolystyrene-b-poly(ethylene oxide) diblock copolymer. Photoinduced [4 + 4] cycloaddition (λ = 365 nm) of terminal anthracene groups populating the hydrophilic corona of each micelle was used to produce polystyrene-b-poly(ethylene oxide)-b-polystyrene triblock copolymer tethers or network strands among adjacent micelles. Structural uniformity in the micelle population was confirmed by small-angle X-ray scattering (SAXS), cryogenic transmission electron microscopy (cryo-TEM), and dynamic light scattering (DLS). Homogeneous dispersal of the assembled micelle building blocks in water resulted in spreadable or moldable photoactive micelle solutions, studied for their stability in solution and ability to rapidly form elastomeric hydrogels once irradiated. Once in molds, these solutions of varied concentration were irradiated to form soft TPE hydrogels with dynamic shear modulus controllable with irradiation time (triblock copolymer content), exhibiting prescribed shape consistent with high-fidelity conformal fill.

Original languageEnglish
Pages (from-to)5377-5387
Number of pages11
JournalACS Applied Polymer Materials
Volume2
Issue number12
DOIs
Publication statusPublished - 11 Dec 2020

Bibliographical note

Funding Information:
This work was supported by the National Science Foundation under Grants CBET-1160026 and DMR-1808824, The Netherlands Organisation for Scientific Research (NWO Graduate Program 2010:022.002.028), and the Dutch Ministry of Education, Culture and Science (Gravity program 024.001.035). N.A.H. was also partially supported through the Walter Scott College of Engineering Graduate Teaching Fellowship Program at Colorado State University.

Keywords

  • anthracene
  • block copolymer
  • hydrogel
  • micelle
  • photocycloaddition
  • physically cross-linked networks
  • thermoplastic elastomer

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