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Arresting Microphase Separation Encodes Material Mechanics by Sculpting Microarchitectures and Local Polymer

Castro Johnbosco1, Floris Dalenoord1, Jarno Hiemstra1

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Advanced Materials (Deerfield Beach, Fla.)
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PubMed
Summary

Microarchitectural design in hydrogels, using aqueous two-phase systems (ATPS) and single polymer phase separation (SPPS), significantly enhances mechanical properties like toughness and energy dissipation.

Keywords:
aqueous two‐phase systemmechanicsmicroarchitecturesmultiscale materialssoft matter

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials Engineering

Background:

  • Mechanical properties are crucial for material function, but the impact of microarchitectures in hydrogels, particularly toughness and energy dissipation, is not well understood.
  • Aqueous two-phase systems (ATPS) offer a method to create microarchitectures in soft materials like hydrogels.

Purpose of the Study:

  • To systematically engineer diverse microarchitectures in hydrogels using ATPS and investigate their distinct mechanical behaviors.
  • To develop a novel strategy, single polymer phase separation (SPPS), for microarchitectural control in hydrogels.
  • To explore the relationship between microarchitectural design and hydrogel mechanical properties, including stiffness, toughness, and energy dissipation.

Main Methods:

  • Engineered diverse microarchitectures (inverse globular, globular, spinodal) within hydrogels via ATPS-induced local polymer enrichment.
  • Developed and applied single polymer phase separation (SPPS) by tuning ionic concentration to sculpt microarchitectures.
  • Characterized the mechanical properties (stiffness, toughness, energy dissipation) of hydrogels with different microarchitectures.

Main Results:

  • Different microarchitectures exhibited distinct mechanical behaviors.
  • Spinodal hydrogel designs demonstrated improved load distribution, fracture resistance, and energy dissipation.
  • SPPS enabled scalable, low-complexity control over mechanical properties independent of secondary polymers.
  • Spinodal architectures also enhanced cell migration and biological activity.

Conclusions:

  • Microarchitectural design, not just polymer composition, dictates hydrogel mechanics.
  • ATPS and SPPS are robust, scalable methods to encode mechanical and functional properties into hydrogels via microarchitecture.
  • These findings open opportunities in tissue engineering, biofabrication, soft electronics, and food engineering.