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Related Concept Videos

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.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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Related Experiment Video

Updated: Jan 19, 2026

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Polyimide-Based PolyHIPEs Prepared via Pickering High Internal Phase Emulsions.

In-Ho Song1, Dong-Min Kim2, Ju-Young Choi3

  • 1Department of Chemistry, Yonsei University, Wonju, Gangwon-do 26493, Korea. segunda@nate.com.

Polymers
|September 22, 2019
PubMed
Summary

Researchers developed high-temperature polyimide-based polyHIPEs using pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) stabilizers. These materials exhibit high porosity and thermal stability, making them suitable for demanding applications.

Keywords:
Pickering high internal phase emulsionpolyHIPEporous polyimide

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Colloid Science

Background:

  • Developing robust materials for high-temperature applications is crucial.
  • Pickering high internal phase emulsions (HIPEs) offer a versatile templating route for porous materials.
  • Stabilizers are key to controlling emulsion stability and resulting material properties.

Purpose of the Study:

  • To synthesize and characterize polyimide-based polyHIPEs using novel stabilizers.
  • To investigate the stability of oil-in-water Pickering HIPEs stabilized by pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) oligoimide particles and poly(amic acid) salt (PAAS).
  • To evaluate the thermal and mechanical properties of the resulting polyHIPEs.

Main Methods:

  • Synthesis of PMDA-ODA oligoimide particles and PAAS.
  • Preparation of oil-in-water Pickering HIPEs using these stabilizers.
  • Dispersion stability analysis of the emulsions.
  • Fabrication of polyHIPEs via freeze-drying and thermal imidization.
  • Characterization of polyHIPEs' morphology, porosity, thermal decomposition temperature, and compression modulus.

Main Results:

  • Stable Pickering HIPEs were successfully prepared using PMDA-ODA based stabilizers.
  • Polyimide-based polyHIPEs were fabricated with high porosity (up to 92%).
  • The polyHIPEs demonstrated exceptional thermal stability, with a decomposition temperature exceeding 530 °C.

Conclusions:

  • PMDA-ODA based stabilizers are effective for creating stable Pickering HIPEs.
  • The resulting polyimide-based polyHIPEs possess excellent thermal resistance and high porosity.
  • These materials show significant potential for use in high-temperature environments.