Chemistry and Properties of Cross-Linked All-Aromatic Hyperbranched Polyaryletherketones

Journal article (2021)

Authors

W. Vogel Dutch Polymer Institute, Novel Aerospace Materials - Aerospace Engineering
Maruti Hegde University of North Carolina
Andrew N. Keith University of North Carolina
Sergei S. Sheiko University of North Carolina
T.J. Dingemans University of North Carolina, Novel Aerospace Materials - Aerospace Engineering
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
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Published Date

2021

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

Abstract

Thermoplastic polyaryletherketones (PAEKs) exhibit excellent mechanical properties and fluid stability, but their glass transition temperatures (Tg) are low and their all-aromatic nature makes processing challenging. We will present a synthetic route toward phenylethynyl-functionalized hyperbranched PAEKs (hbPAEKs) (Tg = 151 °C) that can be cross-linked to form flexible films with high Tg's (187-237 °C) and good mechanical properties (E′ = 4 GPa, σ = 44 MPa, and ϵ = 1.76%). After cross-linking, the films are amorphous, easy to handle, and insoluble. We will report on the melt rheology of the hbPAEK precursors, with and without reactive phenylethynyl-reactive functionalities, and the thermomechanical characteristics of thin cross-linked films using dynamic mechanical thermal analysis, differential scanning calorimetry, and tensile testing. We believe that our findings can be extended to other all-aromatic structural and functional polymer architectures that are otherwise impossible to process.