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Barrier properties of polylactic acid to binary aqueous solution systems.

Yuchao Du1, Jilong Cao1, Wanling Li1

  • 1State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute of Sichuan University, Chengdu 610065, China.

International Journal of Biological Macromolecules
|February 15, 2025
PubMed
Summary

Polylactic acid (PLA) exhibits varying barrier properties against aqueous solutions. SELS and NaCl solutions show better resistance than AcOH and EtOH, indicating solution structure impacts PLA

Keywords:
Barrier propertiesBinary aqueous solutionPermeation testPolylactide acidTime-resolved infrared spectroscopy

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Area of Science:

  • Materials Science
  • Polymer Science
  • Physical Chemistry

Background:

  • Polylactic acid (PLA) is a biodegradable polymer with potential applications requiring barrier properties.
  • Understanding PLA's interaction with various aqueous solutions is crucial for optimizing its use in packaging and biomedical fields.

Purpose of the Study:

  • To investigate the barrier properties of polylactic acid (PLA) against four binary aqueous solutions: sodium chloride (NaCl), sodium lauryl polyoxyethylene ether sulfate (SELS), acetic acid (AcOH), and ethanol (EtOH).
  • To correlate solution structure with PLA's adhesion, diffusion, and permeation characteristics.

Main Methods:

  • Contact angle and surface tension measurements to determine adhesion work.
  • Time-resolved infrared spectroscopy (TRIS) to measure water diffusion coefficients (DATR).
  • Permeation tests to detect solute permeation rates (Pcell).

Main Results:

  • Single water exhibited the highest adhesion work (89.2 J/m2) to PLA.
  • Water diffusion coefficients (DATR) were lower for NaCl and SELS solutions compared to pure water, but higher for AcOH and EtOH solutions at 25 mass%.
  • Solute permeation (Pcell) through PLA increased with solution concentration up to 25 mass%.

Conclusions:

  • The barrier performance of PLA against the tested solutions follows the order: SELS > NaCl > AcOH > EtOH.
  • PLA's interaction with aqueous solutions is significantly influenced by the solute's chemical structure.
  • These findings provide insights into tailoring PLA-based materials for specific barrier applications.