J. Mater. Sci. Technol. ›› 2023, Vol. 139: 189-197.DOI: 10.1016/j.jmst.2022.09.005

• Research Article • Previous Articles     Next Articles

Block copolymer functionalized quartz fibers/cyanate ester wave-transparent laminated composites

Jiani Zhanga, Zheng Liua, Muyi Hanb, Junliang Zhanga, Yusheng Tanga,*, Junwei Gua,*   

  1. aShaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
    bQueen Mary University of London Engineering School, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2022-09-04 Revised:2022-09-29 Accepted:2022-09-29 Published:2023-03-10 Online:2023-03-06
  • Contact: *E-mail addresses: tys@nwpu.edu.cn (Y. Tang), gjw@nwpu.edu.cn (J. Gu) .

Abstract: A block copolymer of PDMS-b-PGMA is synthesized by polymerizing glycidyl methacrylate (GMA) via reversible addition-fragmentation chain transfer (RAFT) polymerization applying a polydimethylsiloxane (PDMS) based macro-RAFT agent, which is then performed to functionalize the quartz fibers (QFs@PDMS-b-PGMA) via a simple coating process. Finally, the QFs@PDMS-b-PGMA/bisphenol A dicyanate ester (BADCy) wave-transparent laminated composites are fabricated by high-temperature molding. Nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and size exclusion chromatography (SEC) demonstrate the successful preparation of PDMS-b-PGMA with expected structure. When the molar mass and coating amount of PDMS-b-PGMA are respectively 8100 g/mol and 2.0 wt.%, QFs@PDMS-b-PGMA/BADCy wave-transparent laminated composites present optimal mechanical properties and wave-transparent performance. The interlaminar shear strength (ILSS) and flexural strength are 53.6 and 552.0 MPa, respectively. Meanwhile, the dielectric constant and dielectric loss values are 2.61 and 0.0028 at 1 MHz (wave transmittance of 93.8%), showing good stability at different frequencies (102-106 Hz and 8.4-12.4 GHz) and temperatures (25-250 °C).

Key words: Bisphenol A dicyanate ester (BADCy) resins, Quartz fibers (QFs), Wave-transparent laminated composites, Block copolymer