Design and synthesis of poly(arylene ether sulfone)s with high glass transition temperature by introducing biphenylene groups

Abstract

Two novel poly(arylene ether sulfone)s with high biphenylene content (BDS-PES and BDS-PDBES) are prepared by nucleophilic substitution polymerization of synthesized 4,4 0-bis(4-hydroxyphenyl)diphenyl sulfone (BDS) with 4,4 0-sulfonylbis(fluorobenzene) and 4,4-bis[(4-chlorophenyl)sulfonyl], respectively. The prepared polymers show high glass transition temperature and excellent high-temperature mechanical properties. The glass transition temperature of BDS-PDBES with higher biphenylene content is as high as 300°C, and BDS-PDBES can still maintain its 30% storage modulus at 295°C. In addition, the two novel polymers also show excellent thermal stability (T d5 = 526°C), high elongation at break (ε ≈ 20%), good tensile strength (73 MPa) and modulus (1.73 GPa) and good thermal conductivity (⊗ 300°C = 0.28 W •m −1 •K −1).

Mechanical and macromolecular changes during thermal degradation of polyphenylsulfone

“…Thermograms display the expected shape of amorphous polymers. Initial glass transition value is around 220 °C for unaged polymers in agreement with previous papers [14] . For unaged PPSU, only the glass transition is visible at around 220 °C, this value being commented in the following section.…”

Study on the Melt Memory Effect and Melt Recrystallization Behavior of Crystallizable Biphenylene Poly(arylene ether sulfone ketone)

“…With the increase in molecular weight, the T g of BD-PESK 1–3 gradually increased from 210 to 244 °C. Due to the introduction of biphenylene units, the T g of BD-PESK 2 is higher than that of PPSU (221 °C) at a similar viscosity. Meanwhile, it also has appropriate T m s of 348–352 °C, which are slightly higher than that of PEEK (340 °C).…”

“…4-Methoxyphenylboronic acid and 4,4′-dichlorodiphenyl sulfone were purchased from Energy Chemical Co. Ltd (Shanghai, China) to synthesize the monomer 4,4′-bis­(4-hydroxyphenyl) diphenyl sulfone­(BDS). , The synthesis and purification process of monomer BDS was consistent with the previous report of our research group. , 4,4′-Difluoro diphenylmethanone, tetrakis (triphenylphosphine) palladium (0), and hydroiodic acid were also purchased from Energy Chemical Co. Ltd (Shanghai, China). Diphenyl sulfone was purchased from Xiangshui County Xiandai Chemical Co. Ltd (Xiangshui County, China).…”

“…22,23 The synthesis and purification process of monomer BDS was consistent with the previous report of our research group. 24,25 4,4′-Difluoro diphenylmethanone, tetrakis (triphenylphosphine) palladium (0), and hydroiodic acid were also purchased from Energy Chemical Co. Ltd (Shanghai, China). Diphenyl sulfone was purchased from Xiangshui County Xiandai Chemical Co. Ltd (Xiangshui County, China).…”

Toward Scalable Production: Catalyst‐Coated Membranes (CCMs) for Anion‐Exchange Membrane Water Electrolysis via Direct Bar Coating

“…By exceeding the glass transition temperature of the ionomer the catalyst layer sticks to the membrane. However, polyarylene-based ionomers, such as those typically used in anion exchange membranes, usually have glass transition points far above 200 °C [11][12][13][14][15][16] which renders the thermal decal process impossible. Directly coating the catalyst ink onto the membrane involves less processing steps and is therefore of high interest also in PEM systems.…”