4.7 Article

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

期刊

MACROMOLECULES
卷 55, 期 1, 页码 100-112

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AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.1c01998

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  1. DPI Project [718]

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The study presents a synthetic route towards phenylethynyl-functionalized hyperbranched PAEKs with high T-g, which can be cross-linked to form flexible films with good mechanical properties, offering a new solution to the issues of low T-g and processing challenges in PAEKs.
Thermoplastic polyaryletherketones (PAEKs) exhibit excellent mechanical properties and fluid stability, but their glass transition temperatures (T-g) are low and their all-aromatic nature makes processing challenging. We will present a synthetic route toward phenylethynyl-functionalized hyperbranched PAEKs (hbPAEKs) (T-g = 151 degrees C) that can be cross-linked to form flexible films with high T-g's (187-237 degrees C) and good mechanical properties (E' = 4 GPa, sigma = 44 MPa, and epsilon = 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.

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