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Method for preparation, programming, and characterization of miniaturized particulate shape-memory polymer matrices.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Shape-memory polymers (SMPs) are of great interest for minimally invasive surgery due to their shape-changing capabilities.
  • Evaluating miniaturized SMPs for small implants or controlled release systems requires a robust preparation and characterization strategy.

Purpose of the Study:

  • To develop and evaluate a method for preparing and characterizing microsized SMP particles.
  • To investigate the influence of process parameters on the formation and size distribution of SMP microparticles.
  • To establish a routine for assessing the microscale functionality of SMPs in miniaturized applications.

Main Methods:

  • Emulsion-based preparation of approximately 30 μm microparticles (MPs) from phase-segregated SMPs: poly(ε-caprolactone) [PCL] and poly(ω-pentadecalactone) [PPDL].
  • Investigation of process parameters including polymer solvents and stabilizer type/concentration.
  • Development of processes for loading SMP MPs into water-soluble polymer films for programming temporary shapes via film stretching.
  • Utilization of a light microscopy-based setup with temperature control for evaluating shape recovery of the microparticles.

Main Results:

  • Successful preparation of ~30 μm SMP MPs using an emulsion-based method.
  • Demonstrated control over microparticle formation and size distribution by adjusting process parameters.
  • Successfully programmed SMP MPs to a temporary ellipsoid shape using film stretching.
  • Confirmed stimuli-induced shape recovery of microsized SMP matrices using a microscopy setup.

Conclusions:

  • A methodological strategy for preparing and evaluating microsized SMP particles has been established.
  • This approach enables the characterization of microscale SMP functionality for miniaturized applications.
  • The developed routine is broadly accessible for various thermoplastic SMPs, facilitating their use in advanced biomedical devices.