Abstract
Polytrifluorochloroethylene (PCTFE) is one of the earliest synthesized and commercialized fluoroplastics. It shows ultralow dielectric constant and loss coupled with other excellent properties such as good water vapor permeation resistance, anti-corrosion, light transparency, creep resistance, and so forth, exhibiting great potential to break the bottleneck of the development of high-frequency communication field. Besides, PCTFE-based materials have already played an essential role in some high-tech fields, including chemical, medical, aerospace, and electrical industries. However, in terms of fundamental research, most of the reports concerning the chemical and physical structure of PCTFE came from the last century, but very few in recent years. Herein, the history of the development and the research progress of the structure, properties, and modification of PCTFE was introduced respectively and finally the perspective was proposed, aiming to provide guidance for the future research and application of PCTFE-based materials.
Highlights
With the rapid development of high-frequency microwave communication technology, microwave systems are moving toward integration, multi-functionalization, high speed, and low dielectric loss (Wang et al, 2020a)
The intrinsic insolubility and infusibility make PTFE unable to be processed with conventional technologies used for thermoplastics (Dhanumalayan and Joshi, 2018; Tomkovic and Hatzikiriakos, 2020)
Replacement of just a single fluorine atom of PTFE with chlorine destroys the symmetry of molecular structure to reduce crystallinity and lower the melting point; polytrifluorochloroethylene (PCTFE) shows satisfying
Summary
With the rapid development of high-frequency microwave communication technology, microwave systems are moving toward integration, multi-functionalization, high speed, and low dielectric loss (Wang et al, 2020a). Ultra-large-scale integrated circuits (ICs) with ultrahigh integration, lower power consumption, and higher performance raise more stringent requirements for high-frequency dielectric polymeric materials. Novel polymer materials with controlled dielectric constant and low loss have attracted more and more attention all over the world. Benefiting from the highly symmetric and closely packed molecular chains, polytetrafluoroethylene (PTFE) possesses ultralow dielectric constant and dielectric loss (Wang et al, 2020b). The creep resistance and dimensional stability are inferior due to the weak interaction between PTFE molecular chains (Dhanumalayan and Joshi, 2018). PTFE cannot meet the full demand of electronic communication field, which requires high stability and accuracy of signal transmission. Melting point, °C Melt viscosity, Pa·s Volume resistivity, Ω·cm Dielectric constant, 25°C at 103 Hz Dissipation factor, 25°C at 103 Hz Dielectric strength, kV/mm Vapor transmission rate, g·mm/m2·day Heat distortion, °C at 0.45 MPa Coefficient of thermal expansion (cm/cm/°C × 105) Solar transmission, % Creep resistance
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