Fluorinated aromatic PI films:preparation,low dielectric loss and other properties
Polyimide(PI)thin films have broad application prospects in 5G communication scenarios,but 5G antenna substrates have very strict requirements for the dielectric loss performance of PI thin films under high-frequency electric fields.Focusing on this topic,this study prepared fluorinated copolymer polyimide films and explored some influencing factors on the low dielectric loss performance of PI films at high frequencies.The thermal properties,thermal stability,and light transmittance of thin film samples with different propor-tions were studied using various testing methods such as infrared,ultraviolet,thermogravimetric analysis,and differential scanning calorimetry.The results show that the highest transmittance of PI films is above 90%;The maximum tensile strength of PI AD series PI films is 112.68 MPa,and the tensile modulus is 3.22 GPa;The maximum tensile strength of PI AE series PI films is 119.32 MPa,and the tensile modulus is 3.52 GPa;The temperature of PI films start thermal weight loss above 500℃,and the glass transition temperature reaches above 270℃;Under the condition of an electric field of 10 GHz,the dielectric constants of fluorinated copoly-mer PI films are all below 3,and the minimum dielectric loss is 0.00412.
PI filmfluorine contentaromatic groupdielectric loss
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