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Probing the Nanoscale Heterogeneous Mixing in a High-Performance Polymer Blend.

Alexander Paul Fellows1, Debashis Puhan1, Janet S S Wong2

  • 1Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.

Polymers
|January 11, 2022
PubMed
Summary

High-performance polyetheretherketone (PEEK) and polybenzimidazole (PBI) blends show molecular mixing at domain interfaces. This nanoscale understanding is key to their advanced material properties.

Keywords:
atomic force microscopyhigh performance polymersinfrared nanospectroscopynanoscale thermal analysispolybenzimidazolepolyetheretherketone

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Polyetheretherketone (PEEK) and polybenzimidazole (PBI) blends offer high temperature stability and tribological properties.
  • Understanding the nanoscale structure and interface is crucial for optimizing blend performance.
  • Characterizing blend interfaces presents significant experimental challenges.

Purpose of the Study:

  • To investigate the nanoscale chemical heterogeneity and mixing at the interface of PEEK/PBI blends.
  • To elucidate the molecular-scale interactions within the blend structure.
  • To establish a link between nanoscale properties and macroscopic material performance.

Main Methods:

  • Combined Atomic Force Microscopy with an Infrared laser (AFM-IR) for chemical analysis.
  • Utilized thermal cantilever probes (nanoTA) for nanoscale thermal property mapping.
  • Applied correlative microscopy techniques to analyze domain structures and interfaces.

Main Results:

  • AFM-IR and nanoTA revealed distinct compositional differences in blend domains compared to pure PEEK and PBI.
  • A significant transition region, several microns wide, was observed at domain boundaries.
  • Evidence of molecular-scale physical mixing was identified at the interface.

Conclusions:

  • The combined AFM-IR and nanoTA methodology provides unprecedented nanoscale chemical insights into polymer blends.
  • The observed interfacial mixing is critical for understanding the superior properties of PEEK/PBI blends.
  • This approach is versatile for characterizing nanoscale structure-property relationships in diverse materials.