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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Updated: Jun 17, 2025

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Water-soluble biodegradable polyesters with pH and ionic responsivity.

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.

Journal of Hazardous Materials
|August 8, 2024
PubMed
Summary
This summary is machine-generated.

Novel water-soluble and biodegradable polymers were developed using poly(butylene succinate-co-butylene terephthalate) and sodium 1-3-isophthalate-5-sulfonate. These ionic copolyesters show tunable degradation for targeted drug delivery applications.

Keywords:
Ion and temperature responsive water-soluble polymersPBSTSodium isophthalate sulfonatepH responsive degradation

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials Engineering

Background:

  • Developing water-soluble and biodegradable polymers is crucial for reducing environmental impact.
  • Semi-aromatic copolyesters like poly(butylene succinate-co-butylene terephthalate) (PBST) offer biodegradability.
  • Modifying existing biodegradable polymers can enhance their functionality for specific applications.

Purpose of the Study:

  • To synthesize novel water-soluble and biodegradable copolyesters.
  • To investigate the impact of ionic groups on polymer properties and degradation.
  • To explore the potential of these materials for controlled drug delivery systems.

Main Methods:

  • Melt copolymerization of PBST with sodium 1-3-isophthalate-5-sulfonate (SIPA) to create PBSTS.
  • Characterization of hydrophilicity, water absorption, and responsivity (ionic and temperature).
  • Assessment of pH-dependent degradation in various simulated body fluids.

Main Results:

  • The synthesized poly(butylene succinate-co-butylene terephthalate-co-butylene 5-sodiosulfoisophthalate) (PBSTS) copolyesters are water-soluble and exhibit ionic and temperature responsivity.
  • Degradation rates are pH-dependent, accelerating at pH 5.5 and 8.5, and inhibited at pH 7.2.
  • Significant degradation occurred in simulated gastric fluid (pH 1.5), with minimal degradation in intestinal (pH 6.8) and physiological fluids (pH 7.0).

Conclusions:

  • The novel ionic biodegradable copolyesters demonstrate unique pH-responsive degradation profiles.
  • The selective degradation in acidic environments suggests potential for targeted drug delivery.
  • These materials offer a promising platform for localized and controlled release applications in the human body.