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Related Concept Videos

Cellulose and Pectic Polysaccharides01:15

Cellulose and Pectic Polysaccharides

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Multi-stimulus-responsive shape-memory polymer nanocomposite network cross-linked by cellulose nanocrystals.

Ye Liu1, Ying Li, Guang Yang

  • 1Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University , Chengdu, Sichuan 610031, P. R. China.

ACS Applied Materials & Interfaces
|February 4, 2015
PubMed
Summary

Researchers created a smart polymer nanocomposite using cellulose nanocrystals, polycaprolactone, and polyethylene glycol. This material shows shape-memory effects in water and is biocompatible, suggesting potential for new smart biomaterials.

Keywords:
cellulose nanocrystalsnanocompositeshape memorythermoresponsivewater-responsive

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Shape-memory polymers (SMPs) offer dynamic functionalities for advanced applications.
  • Integrating nanostructures can enhance polymer properties and introduce novel responses.
  • Biocompatible materials are crucial for developing advanced medical devices and implants.

Purpose of the Study:

  • To develop a novel thermoresponsive and water-responsive shape-memory polymer nanocomposite.
  • To investigate the effects of cellulose nanocrystals (CNCs) on polymer network properties.
  • To evaluate the cytocompatibility of the developed nanocomposite for potential biomedical applications.

Main Methods:

  • Chemically cross-linking cellulose nanocrystals (CNCs) with polycaprolactone (PCL) and polyethylene glycol (PEG).
  • Comprehensive characterization including microstructure, cross-link density, water uptake, and mechanical properties.
  • In vitro cytocompatibility assessment using Alamar blue assays with osteoblasts.

Main Results:

  • The PEG[60]-PCL[40]-CNC[10] nanocomposite demonstrated significant thermo-induced and water-induced shape-memory effects at 37 °C.
  • Cellulose nanocrystals enhanced the mechanical properties of the PCL-PEG polymer blend.
  • Alamar blue assays confirmed good cytocompatibility of the nanocomposites with osteoblasts.

Conclusions:

  • The developed nanocomposite exhibits dual thermo- and water-responsive shape-memory behavior.
  • CNCs incorporation significantly improves mechanical strength and performance.
  • The material's biocompatibility and smart properties make it a promising candidate for smart biomaterial development.