Properties of a few aromatic poly(thioether ketones) as sulfur‐containing high‐performance polymers

Abstract

Several basic physical properties of poly-(thioether ketones) (PTEKs) were studied in comparison with corresponding ether analogs, poly(ether ketones) (PEKs), and various typical engineering plastics. The water absorption of PTEK (0.13%) was lower than that of the corresponding PEK (0.16%), probably because of the hydrophobic nature of the sulfide group. The dielectric breakdown strengths of PTEK and PEK were much greater than that of commercially available polymers. PTEK had higher dielectric breakdown strength than PEK. Although the volume resistivity of PEK considerably decreased after water absorption, that of PTEK remained high even after water absorption. PTEK exhibited a remarkably high refractive index (n D 23 1.66). ␣-Transition corresponding to T g was observed at a high temperature (PTEK-1, 235°C; PTEK-2, 269°C) in the dynamic mechanical analysis. Young's modulus and tensile strength of PTEK were comparable to those of commercial high-performance polymers. PTEK also exhibited excellent flame resistance. Although the linear thermal expansion coefficient of PTEK was greater than that of PEEK, it was still within a practically acceptable level

Fluorene‐rich high performance polyesters: Synthesis and characterization of 9,9‐fluorenylidene and 2,7‐fluorenylene‐based polyesters with excellent optical property

“…Optically transparent polymers with low birefringence and high refractive index have long been required in a variety of optical material fields such as lenses and functional films for liquid crystal displays (LCDs), and optical disks because of their easy processing, light weight, and high transparency 1. Many researches have devoted to increase the refractive index value and to reduce the birefringence of polymers by several approaches such as incorporation of perfluorocyclobutane group,2 adamantane group,3, 4 and sulfur atom5 into polymers in addition to use of organic–inorganic hybrid nanocomposite 6–8. The polymers containing fluorene skeletons, especially those possessing diaryl substituents at the bridge (C‐9) position which are recognized as the cardo structure, have attracted considerable interest owing to their high solubility in addition to high thermal stability.…”

Miscibility analysis of polyethersulfone and polytetrafluoroethylene using the molecular dynamics method

“…However, heat and wear resistances of PTFE are lower than polyethersulfone (PES), polyetheretherketone and polyimide [23,24]. As a thermoplastic polymer, PES has the excellent mechanical and insulation properties, and its performances of thermal stability and processability are well balanced [25].…”

Synthesis and characterization of alkaline‐soluble triazine‐based poly(phenylene sulfide)s with high refractive index and low birefringence

“…Such polymers have several advantages of not only high thermal, oxidative, and chemical stabilities but also high stiffness and toughness . Recently, poly(thioether ketones) and poly(aryl thioether)s containing fluorene, sulfone, and oxadiazole substituents have been developed for optical applications . Most of the polymers showed high thermal stability and excellent optical transparency with low birefringence.…”

“…22 Recently, poly(thioether ketones) and poly(aryl thioether)s containing fluorene, sulfone, and oxadiazole substituents have been developed for optical applications. 13,[23][24][25][26] Most of the polymers showed high thermal stability and excellent optical transparency with low birefringence. However, the n values of these polymers are in the range of 1.65-1.72 at the sodium-D line (589 nm).…”