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Ultra Low Density and Highly Crosslinked Biocompatible Shape Memory Polyurethane Foams.

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Researchers developed novel polyurethane shape memory foams with ultra-low density and high shape recovery. These smart biomaterials exhibit excellent thermomechanical properties and low bio-reactivity for diverse applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Shape memory polymers (SMPs) offer tunable recovery properties.
  • Developing ultra-low density, highly crosslinked SMPs remains a challenge.
  • Controlling glass transition temperature (Tg) is crucial for specific applications.

Purpose of the Study:

  • To synthesize and characterize novel polyurethane shape memory foams.
  • To achieve ultra-low density with high chemical crosslinking.
  • To tailor the glass transition temperature (Tg) for functional applications.

Main Methods:

  • Synthesis of polyurethane foams using symmetrical, low molecular weight, branched hydroxyl monomers.
  • Characterization of chemical crosslinking and density.
  • Thermomechanical testing to evaluate shape memory behavior, including shape recovery, storage modulus, and recovery stress.
  • In-vitro cell activation assays to assess bio-reactivity.

Main Results:

  • Achieved highly chemically crosslinked, ultra-low density (~0.015 g/cc) polyurethane foams.
  • Customizable single glass transitions (Tg) in the 45-70 °C range.
  • Demonstrated excellent shape memory behavior with 97-98% shape recovery over multiple cycles.
  • Exhibited high volume expansion (up to 70x) upon actuation.
  • Showed low acute bio-reactivity in in-vitro cell activation tests.

Conclusions:

  • Successfully developed novel polyurethane shape memory foams with desirable properties.
  • The foams exhibit significant potential as smart biomaterials.
  • These materials are suitable for applications requiring high recovery, tunable Tg, and low bio-reactivity.