Design and synthesis of novel poly (aryl ether ketones) containing trifluoromethyl and trifluoromethoxy groups

ABSTRACT

The high-frequency and high-speed communication in the 5 G era puts forward requirements for the dielectric properties of polymers. Introducing fluorine into poly(ary ether ketone) can improve its dielectric properties. In this work, by introducing the fluorine group strategy, we successfully designed and synthesized three novel trifluoromethyl (−CF₃) or trifluoromethoxy (−OCF₃)-containing bisphenol monomers and their F-substitution PEK-based polymers (PEK-Ins). All these PEK-Ins exhibited good thermal, mechanical and dielectric properties. The T d5% of the three polymers is all higher than 520℃. The free volume fraction of novel polymers increased from 3.75% to 5.72%. Among the three polymers, exhibited the lowest dielectric constant of the films is 2.839, and the dielectric loss is 0.0048, ascribing to the increasing free volume. The Young’s modulus of the polymer film is as high as 2.9 GPa and the tensile strength is as high as 84 MPa. PEK-Ins reduced the dielectric constant by introducing a low fluorine content. This study provides a new way to design PEK to synthesize low dielectric constant polymers.

KEYWORDS:

• Poly (arylene ether ketone)
• trifluoromethyl
• low dielectric
• free volume

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability statement

The authors confirm that the data supporting the findings of this study are available within the article and its supplementary materials.

Additional information

Funding

This work was funded by the National Key R&D Program of China (2022YFB3704603), Shandong Provincial Natural Science Foundation (Joint Fund for Innovation and Development ZR2022LFG002), Jiangsu Provincial Key Research and Development Program (BE2022054-4), Dalian Institute of Chemical Physics (DICP, grant No. DICP I202033) and Liaoning Revitalization Talents Program (XLYC2008022).