Blow molding liquid crystal aromatic polyester/polyetherimide film by rotating die: Enhanced film bubble stability and mechanical properties

Abstract Liquid crystal polymer (LCP) is the preferred material for 5G antenna materials, but its poor film processing performance has become the main factor restricting its development. In this paper, polyetherimide (PEI) was blended with LCP, and LCP/PEI composite films were prepared by interleaved extension blow molding equipment. The effects of PEI content and interleaved extension blow molding equipment on the stability of the film bubble and the properties of the product were studied. The results show that the addition of PEI can effectively improve the stability of the film bubble in the process of interleaved extension blow molding, and the toughness of the prepared LCP/PEI composite film is obviously improved. In addition, the addition of PEI does not affect the low dielectric properties of LCP, which perfectly matches the low dielectric characteristics required for 5G communication.