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Related Experiment Video

Updated: Jul 18, 2026

A Facile and Eco-friendly Route to Fabricate Poly(Lactic Acid) Scaffolds with Graded Pore Size
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A Facile and Eco-friendly Route to Fabricate Poly(Lactic Acid) Scaffolds with Graded Pore Size

Published on: October 17, 2016

Layered open pore poly(L-lactic acid) nanomorphology.

Xia Liao1, A Victoria Nawaby, Pamela Whitfield

  • 1Institute for Chemical Process and Environmental Technology, National Research Council of Canada, Ottawa, Ontario, K1A 0R6 Canada.

Biomacromolecules
|November 14, 2006
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Summary

Researchers created open and interconnected carbon dioxide (CO(2)) foams from poly(L-lactic acid). Varying CO(2) concentration produced distinct skin-core structures with tunable pore sizes, offering new material possibilities.

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Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo

Published on: July 1, 2013

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Poly(L-lactic acid) (PLLA) is a biodegradable and biocompatible polymer with diverse applications.
  • Foam structures offer unique properties like low density and high surface area, but creating interconnected porosity remains challenging.
  • Carbon dioxide (CO(2)) is explored as a physical blowing agent for polymer foaming due to its environmental friendliness and tunable properties.

Purpose of the Study:

  • To investigate the formation of open and interconnected CO(2) foams using poly(L-lactic acid).
  • To understand the influence of varying CO(2) concentrations on the foam's morphology and structure.
  • To characterize the resulting skin-core structures and pore characteristics.

Main Methods:

  • Utilizing supercritical or gaseous carbon dioxide as a physical blowing agent for PLLA.
  • Controlling CO(2) concentration and processing parameters to induce phase separation and foam formation.
  • Employing microscopy techniques (e.g., SEM) to analyze the foam's morphology, pore size, and interconnectivity.

Main Results:

  • Successfully fabricated open and interconnected CO(2) foams from PLLA.
  • Demonstrated that varying CO(2) concentration directly impacts the foam's physical structure.
  • Observed a distinct skin-core morphology with larger pores in the core and smaller, interconnected pores in the skin.

Conclusions:

  • Open and interconnected PLLA foams can be effectively generated using CO(2) foaming techniques.
  • CO(2) concentration is a critical parameter for controlling foam architecture, leading to tunable skin-core structures.
  • The developed PLLA foams with controlled porosity show potential for applications requiring specific surface area and interconnected networks.