Syntheses and properties of novel polyarylates with ethyl units as a side group

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%.

Section: Resultssupporting

confidence: 71%

Section: Chemical Structure Characterizationmentioning

confidence: 99%

Section: Polymer Performance Characterizationmentioning

confidence: 99%

Section: Polymer Performance Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of aromatic polyesters derived from bisphenol‐A and bis(hydroxyphenyl)butane with diacyl chloride monomers

Wang

Ding

et al. 2022

Synthesis and properties of copolyarylates containing phenol red units

Wang

et al. 2022

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.

Design of polyarylates containing tert‐butyl cyclohexyl bulky side group with high transparency and low dielectric properties

Yan

Yang

Zhang

2023

Self Cite

A new kind of novel low dielectric constant (D k ) and high transparency polyarylate had been synthesized through interfacial polycondensation with 1,1 0bis (4-hydroxybenzene)-4-tert-butylcyclohexane (Bt-BPZ) containing tert-butyl cyclohexyl bulky side group. As we expect, that the introduction of tert-butyl cyclohexyl with large free volume is proved to be an efficient strategy for obtaining low dielectric constant and high transparency polyarylate. The optimal dielectric property is obtained with 90% Bt-PZA in polyarylate (Bt-PZA91), which show a D k as low as 2.14 at 1 MHz. Meanwhile, Bt-PZA91 also demonstrates good transmittance of 81.08%-88.34% at 450 nm and 78.67-88.26 at 400 nm. The cutoff wavelength of Bt-PZA91 is 304 nm, which is 16 nm shorter than commercial product U-100 (λ c : 320 nm). In addition, the resultant polyarylates showed good comprehensive performance such as T g of 202.2-220.5 C, T d 5% (the initial thermal degradation temperature) of 455.4-468.4 C, tensile strength of 64.7-86.8 MPa and low water absoption (0.41% of Bt-PZA91). Also it was found to can be thermal process, that its convenient thermoplastic processability makes it a great candidate for light-electronic industry, 5G communication, and we believe that Bt-PZA will have a broad application prospect.