Preparation and gel properties of poly(ether ether ketone) with pendent sulfonimide groups

Sheng

High Performance Polymers

et al. 2020

4-(4-Diphenylphosphino)phenyl-2,6-bis(4-hydroxyphenyl)pyridine, as a new bisphenol monomer, was prepared from 4-(diphenylphosphino)benzaldehyde and 4-hydroxyacetophenone and used in the preparation of several aromatic poly(ether ketone)s (PEKs) containing 2,6-diphenylpyridyl units and diphenylphosphinophenyl pendant groups via a nucleophilic aromatic substitution polycondensation with difluorinated aromatic ketones. The polycondensation proceeded quantitatively in tetramethylene sulfone in the presence of anhydrous potassium carbonate and afforded the polymers with high molecular weights. The resulting PEKs are amorphous and exhibit high glass transition temperatures of 209–255°C and 5% weight loss temperatures of 536–554°C with char yields of 57–62% at 800°C in nitrogen. Their high char yields and good limited oxygen index values ranging from 39 to 43 indicated these polymers exhibited good thermal stability and flame-retardant property. All new PEKs were soluble in common organic solvents such as N-methyl-2-pyrrolidone, N,N-dimethylacetamide, and chloroform and could form tough, flexible, and strong films with tensile strengths of 74.6–86.8 MPa, tensile moduli of 2.9–3.6 GPa, and elongations at break of 5–9%.

Section: Introductionmentioning

confidence: 99%

New poly(aryl ether ketone)s containing 2,6-diphenylpyridyl units and diphenylphosphinophenyl pendant groups

Sheng

High Performance Polymers

et al. 2020

J of Applied Polymer Sci

“…According to the Debye equation [eq. ()], polymers with low dielectric constant can be achieved mainly in two ways: one is to increase the molar volume by introducing bulky pendant groups, nanopores, and so on, and another is to decrease the molar polarizability by the incorporation of the least polarizable groups such as fluorine groups . However, the decomposition of fluorine‐containing materials at high temperature can produce HF, and the nonsymmetrical substitution of fluorine groups should result in an increase in the dipole moment and the dielectric constant .…”

Section: Introductionmentioning

confidence: 99%

Poly(arylene ether ketone)s with low dielectric constants derived from polyhedral oligomeric silsesquioxane and difluorinated aromatic ketones

Hao

Wei

et al. 2017

Preparation of low-dielectric-constant poly(arylene ether ketone)s (PAEKs) containing polyhedral oligomeric silsesquioxane (POSS) in the main chains with high molecular weights (up to h inh 5 0.65 dL/g) is reported. The polymers (DDSQ-PAEKs) were synthesized from a diphenol POSS [2OH-DDSQ, or 3,13-di(2-methoxy-4-propylphenol)octaphenyl DDSQ] and three difluorinated aromatic ketones via nucleophilic aromatic substitution polycondensation. All of the DDSQ-PAEKs exhibited lower dielectric constants in the range of 1.95-2.21 at 1 MHz at room temperature compared with the corresponding traditional PAEKs. In particular, DDSQ-PEEK demonstrated good combined characteristics, including low dielectric constant of 1.95 at 1 MHz, high static water contact angle (CA) of 1008, low water sorption of 0.09%, and organosolubility. The relationship between chemical structure and the properties of the DDSQ-PAEKs were investigated in detail.

Metal Sulfonate Polymers as Catalysts for the Heterogeneous Acylation of Aromatic Derivatives

et al. 2016