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 degrees C and initial degradation temperature of 463-482 degrees 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 degrees 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.