Synthesis and Characterization of Soluble Aromatic Polyesters with Side-Chain Azobeneze and Azothiazole Chromophores

Synthesis and properties of copolyarylates containing phenol red units

“…The chemical shifts at δ = 7.19, 7.33 ppm were considered to be the aromatic ring of BPA (2,3). The signal at δ = 8.33 ppm was ascribed to the aromatic proton in TPC (4), and the proton signals at δ = 7.69, 8.45, 9.01 ppm were assigned to the IPC (10)(11)(12). The peaks observed at δ = 7.74, 7.89, 8.18, and 8.24 ppm were ascribed to aromatic protons in the sulfonyl group on the PR units (7-9, 13), and the signals at δ = 7.29 and 7.45 were assigned to protons on the benzene ring of the PR units (5,6).…”

“…Polyarylate is a high‐performance thermoplastic special engineering plastic, which has high strength and high modulus, 1 excellent thermal stability, 2 chemical resistance, 3 optical properties, 4,5 and low dielectric constant, 6 which are well used in aerospace, medical devices, 5G materials, gas separation membranes and other fields 7–9 . However, due to the regular chain structure, the high melting temperature of polyarylates leads to poor processing fluidity 10 . Therefore, researchers usually use molecular structure design methods to improve these deficiencies, which mainly include the introduction of flexible spacer groups, 11–13 bulky pendant groups, 14–17 heterocyclic or nonlinear units, 18,19 copolymerization 20,21 and so on.…”