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A series of novel aromatic copolyesters derived from bisphenol B (BPB) and phenol red (PR) were synthesized by interfacial polymerization. The number‐ and weight‐average molecular weight (Mn and Mw) of the obtained amorphous aromatic copolyesters ranged from 1.06–1.80 × 104 to 2.01–6.17 × 104 g/mol, respectively. Density functional theory calculations showed that the reactivity of BPB was similar to that of bisphenol A. The reaction activation energy of BPB with terephthaloyl and isophthaloyl chloride (TPC and IPC) was 8.23 kcal/mol, and PR with IPC and TPC was 59.30 kcal/mol. Under the influence of the ethyl side group of BPB and the pendant group of PR, the solubility of the aromatic copolymer was improved, and the glass transition temperature (Tg) was 125.1–195.3°C, while Tmax could still be maintained above 525.72°C. The optical transmittance of the copolyesters at 450 nm (T450) was 69.29%–99.41%, and the tensile strength and Young's modulus were in the range of 46.79–58.59 MPa and 1.39–1.86 GPa respectively. All aromatic copolyesters exhibit good mechanical and processability properties and have great application potential as high‐performance plastics. [ABSTRACT FROM AUTHOR]

A series of bisphenols, 4,4′‐sulfobisphenol (BPS)/2,2‐bis(4‐hydroxyphenyl)butane (BPB) co‐polyarylates with amorphous structures were synthesized from two BPS and BPB, and two different structures of benzoyl chloride monomers. The results of DFT calculations showed that the reaction activation energy of BPB with isophthaloyl chloride (IPC) and terephthaloyl chloride (TPC) was 8.05–8.40 Kcal/mol. The reaction activation energy of BPS with IPC and TPC was 38.73–39.09 Kcal/mol. GPC test results were consistent with theoretical calculations with BPS content from 0% to 15% resulting in a copolymer Mn of 22,000–11,600 and a Mw of 46,100–34,800. The intrinsic viscosity of co‐polyarylates ranged from 0.55 to 0.71 dL/g. The glass transition temperature (Tg) and 5% thermal weight loss of the co‐polyarylates were 179.3–205.4 °C and 461.4–487.8 °C, respectively. Improved solubility of co‐polyarylates in polar solvents. At the same time, the introduction of BPS did not result in any loss of mechanical properties, with Young's modulus in the range of 1444.32–1870.45 MPa, elongation at break in the range of 23.7%–30.8%, and tensile strength in the range of 52.21–59.38 MPa. [ABSTRACT FROM AUTHOR]

A series of novel copolyarylates(co‐PARs) containing phenol red units in the backbone were synthesized by interfacial polymerization at 10°C from bisphenol A (BPA), phenol red (PR) and diacid chloride monomers. The obtained copolyarylates (co‐PARs) are all amorphous, the inherent viscosity (ηinh) of 0.22–0.62 dl g−1, and the number‐ and weight‐average molecular weight are 10,200–46,200 and 38,600–203,600, respectively. Adding a small number of PR units to the molecular chains improved the processing fluidity of polyarylates, and the glass transition temperatures (Tg) decreased from 202.8 to 166.7°C. In addition, the co‐PARs have excellent thermal stability with the maximum thermal decomposition temperature of 532.4–545.2°C. The co‐PARs show the best mechanical properties (57.6 MPa) when the PR content is 15 mol%. The transmittances of the co‐PARs at 400 and 450 nm are 79.2%–97.9% and 87.0%–99.8%, respectively, and the cut‐off wavelength is between 320 and 328 nm. The designed and synthesized copolyarylates can be considered as a promising and easy‐to‐process high‐performance engineering plastic. [ABSTRACT FROM AUTHOR]

A series of aromatic polyesters were prepared by the reaction of bisphenol‐A and bis(hydroxyphenyl)butane with diacyl chloride monomers by phase transfer interfacial polycondensation in order to improve the processability of the bisphenol A‐based polyarylate. The microstructure, molecular weight, crystallinity, solubility, thermal properties, mechanical properties, and optical properties of the prepared copolyesters were investigated. Inherent viscosities of the copolyesters are in the range of 0.14–0.53 dl g−1, and their average molecular weights are 7362–44,413 g mol−1, respectively. The feed compositions and copolymer compositions were nearly identical. The results show that with the increase in the content of side ethyl units, the copolyester gradually transforms into an amorphous structure, which is also verified by the improvement in dissolution properties. When the copolyester backbone was introduced into the side ethyl units, the thermal decomposition temperature was less affected and varied in the range of about 10°C, while the value of glass transition temperature reduced from 196.5°C to 165.1°C. The mechanical properties of the polymers are similar to those of the industrial commodity U‐100. In addition, the copolyester films have good optical properties, and the transmittance reached the maximum value of 98.41% when the content of bis(hydroxyphenyl)‐butane was 10%. [ABSTRACT FROM AUTHOR]