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Updated: Sep 11, 2025

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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α-Polyglutamic Acid-Functionalized Polycaprolactone-Based Polyurethane with Integrated Shape Memory Properties and

Jie Zhang1, Lingchen Mao1, Suyang Dai1

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.

Biomacromolecules
|August 11, 2025
PubMed
Summary
This summary is machine-generated.

Novel polycaprolactone-based shape memory polyurethanes functionalized with α-polyglutamic acid demonstrate excellent mechanical properties, shape memory capabilities, and enhanced cell compatibility for tissue engineering applications.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Shape memory polymers (SMPs) offer programmable deformation for tissue engineering.
  • Developing SMPs with combined mechanical strength, shape memory, and bioactivity is challenging.

Purpose of the Study:

  • To synthesize and characterize novel polycaprolactone (PCL)-based shape memory polyurethanes functionalized with α-polyglutamic acid (α-PLGA) side chains (PU-PLGA).
  • To evaluate the mechanical properties, shape memory behavior, and in vitro biological performance of the synthesized PU-PLGAs for tissue engineering applications.

Main Methods:

  • Synthesis of PCL-based polyurethanes with varying α-PLGA content.
  • Thermal analysis (crystallization and melting temperatures).
  • Mechanical testing (tensile strength, elongation at break).
  • In vitro cell culture studies with rat bone marrow mesenchymal stem cells.
  • Conceptual implantation experiments for bone defect repair.

Main Results:

  • PU-PLGAs exhibited crystallization temperatures of 1.4-2.4 °C and melting temperatures of 40-40.4 °C.
  • The 2% α-PLGA variant showed high tensile strength (19.5 MPa) and elongation at break (894.9%).
  • All PU-PLGAs demonstrated excellent shape memory capabilities for complex shape programming.
  • In vitro studies confirmed good cell compatibility (>80% viability) and significantly enhanced stem cell adhesion, proliferation, and osteogenic differentiation with α-PLGA incorporation.

Conclusions:

  • The novel PU-PLGA materials possess a promising combination of mechanical strength, shape memory properties, and bioactivity.
  • These materials show significant potential as scaffolds for bone defect repair in tissue engineering.
  • α-PLGA functionalization is crucial for enhancing the biological performance of PCL-based shape memory polyurethanes.