Dielectric and mechanical properties of polyimide fiber reinforced cyanate ester resin composites with varying resin contents

• Published in: Journal of polymer research 2020, Vol.27 (6), Article 160
• Main Authors: Wang, Zhanwen, Li, Shizhuo, Wang, Jianhua, Han, Enlin, Tian, Guofeng, Wu, Dezhen
• Format: Article
• Language: English
• Subjects: Autoclaving; Bisphenol A dicyanate; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Composite materials; Cyanates; Dielectric loss; Dielectric properties; Esters; Failure modes; Fiber composites; Fiber reinforced polymers; Filament winding; Industrial Chemistry/Chemical Engineering; Laminates; Mechanical properties; Molding (process); Originalpaper; Permittivity; Polyimide resins; Polymer matrix composites; Polymer Sciences; Shear strength; Tensile strength
• ISSN: 1022-9760; 1572-8935
• DOI: 10.1007/s10965-020-02152-y

Polyimide (PI)/ bisphenol A dicyanate esters (BADCy) composite laminates with varying resin contents were prepared by filament winding and autoclave molding process. The laminates exhibited ultralow dielectric constant ( ε of 3.15–3.25) and dielectric loss (tan δ of 0.004–0.006) as well as excellent mechanical properties. When the resin content was 35.6%, the composite achieved outstanding comprehensive properties with tensile strength and modulus equal to 1485.1 MPa and 80.9 GPa, respectively, and the inter-laminar shear strength (ILSS) up to 66.2 MPa. The failure mode of laminates followed an explosive gage middle (XGM) mechanism, which suggested a favorable interface between fiber and resin. According to the mixed law equation, PI fiber at a frequency of 10.2 GHz exhibited dielectric constant of 3.41 ± 0.03 and dielectric loss of about 0.002–0.004. The successful preparation of PI fiber reinforced BADCy composite with low dielectric constant provides new ideas for material design and selection of lightweight high-strength structural-functional integrated composites.