Design of low dielectric constant and high transparent polyarylate containing spiral ring

In this study, a bisphenol containing spiral ring (BP-310) was synthesized with a facile one-step reaction routine. It was copolymerized with terephthaloyl acid chloride (TPC)/isophthalic acid chloride (TPC) and bisphenol A (BPA) to yield intrinsic porous co-polyarylates. The resultant co-polyarylates were found to have good thermal properties with glass transition temperature of 199.6–223.3 °C and initial degradation temperature of 463–482 °C. They could be dissolved in dichloromethane, DMSO, NMP and supplied transparent films with transparency of 86.2–89.4% at 450 nm. Also they were found to have good melt-flowability with melt viscosity of 414–6756 Pas (282–310 °C) and can be injected into different samples with good tensile strength and modulus of 71–73.9 MPa and 1.8–2.4 GPa. With the introduction of intrinsic porous spiral ring, the dielectric constant of the co-polyarylates decreased gradually from 3.0 down to 2.16 (at 107 Hz), tan loss factor reduced from 4.3*10−2 to 2.3*10−2 (at 107 Hz), 9.7*10−3 to 8.3*10−3 (at 104 Hz) respectively. As we expected, with the introduction of spiral ring into the polyarylate molecular chain provides a facile and low cost routine to fabricate intrinsic porous high performance materials, it can be potentially applied in these fields such as high frequency communication system such as 5G/6G.