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Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...

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Biological Compatibility Profile on Biomaterials for Bone Regeneration
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Entropically Toughened Robust Biodegradable Polymer Blends and Composites for Bone Tissue Engineering.

Xunan Hou1, Sonthikan Sitthisang2, Bangjie Song1

  • 1Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore.

ACS Applied Materials & Interfaces
|January 4, 2024
PubMed
Summary

Researchers developed strong, tough biocomposite scaffolds for tissue engineering by improving polymer compatibility and nanofiller dispersion. This strategy enhances material performance for biomedical implants and bone regeneration applications.

Keywords:
bone tissue engineeringinterfacial compatibilizationmechanical propertiespolymer nanocomposites

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Biodegradable polymers and composites are crucial for biomedical implants in tissue engineering.
  • Current composite scaffolds face a strength-toughness challenge due to poor interfacial adhesion and filler dispersion.

Purpose of the Study:

  • To develop a facile and scalable strategy for fabricating strong and tough biocomposite scaffolds.
  • To address the strength-toughness dilemma in current composite scaffold materials.

Main Methods:

  • Fabrication of biocomposite scaffolds using interfacial toughening.
  • Compatibility enhancement of immiscible biopolymer matrices via direct incorporation of a third polymer.
  • Nanoscale dispersion of nanofillers achieved through weak chemical interaction and high-shear melt processing.

Main Results:

  • Ternary blends and composites showed an 11-fold increase in toughness without compromising stiffness and strength.
  • 3D-printed composite scaffolds (70% porosity) exhibited compressive properties comparable to cancellous bone.
  • In vitro cell culture demonstrated good cell viability and effective osteogenic differentiation of human mesenchymal stem cells.

Conclusions:

  • The proposed interfacial toughening strategy successfully creates high-performance biocomposite materials.
  • These advanced biocomposites are suitable for developing next-generation tissue regeneration scaffolds.
  • The strategy offers a widely applicable approach for enhancing biocomposite material properties.