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Ionized copolyesters with pH-responsive degradability: Accelerated degradation in specific environments.

Xiao Li1, Wei-Zhen Zheng1, Peng-Yuan Xu1

  • 1National Engineering Research Center of Engineering Plastics and Ecological Plastics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.

The Science of the Total Environment
|August 30, 2024
PubMed
Summary
This summary is machine-generated.

Environmentally responsive biodegradable polymers offer a solution for plastic stability and degradation. Modified poly(butylene adipate-co-butylene terephthalate) (PBAT) with sodium sulfonate groups (PBATS) shows enhanced properties and pH-responsive degradation, ideal for environmental and medical uses.

Keywords:
IonomersPBATSeawater degradableSodium 5-sulfoisophthalatepH-responsive degradation properties

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Area of Science:

  • Polymer Science
  • Materials Science
  • Environmental Science

Background:

  • Biodegradable plastics require a balance between stability and controlled degradation.
  • Environmentally responsive polymers offer tunable degradation profiles.
  • Poly(butylene adipate-co-butylene terephthalate) (PBAT) is a common biodegradable polyester.

Purpose of the Study:

  • To develop an environmentally responsive biodegradable polyester.
  • To enhance the properties of PBAT through synthetic modification.
  • To investigate the pH-responsive degradation behavior of the modified polymer.

Main Methods:

  • Synthetic modification of poly(butylene adipate-co-butylene terephthalate) (PBAT) with sodium 1-3-isophthalate-5-sulfonate (SIPA) to create PBATS.
  • Characterization of mechanical and thermal properties.
  • Evaluation of hydrophilicity and water absorption.
  • Degradation studies in various pH buffer solutions, natural seawater, and simulated body fluids.

Main Results:

  • The modified copolyester, PBATS, exhibited enhanced mechanical and heat-resistant properties.
  • PBATS showed significantly improved hydrophilicity and water absorption compared to PBAT.
  • Degradation was accelerated in acidic and alkaline conditions and seawater, but inhibited at neutral pH (7.2).
  • Specific and rapid degradation was observed in simulated acidic gastric fluids.

Conclusions:

  • The introduction of sodium sulfonate ionic groups imparts environmentally responsive and pH-dependent degradation to PBAT.
  • PBATS demonstrates tunable degradation, offering advantages over conventional biodegradable polyesters.
  • This material has potential applications in environmental remediation and medical fields due to its responsive degradation characteristics.