Novel Phosphorous‐Containing Aromatic Polyethers – Synthesis and Characterization

Abstract

Summary: The synthesis of novel phosphorous‐containing aromatic polyethers P‐PEEK and P‐PSU, based on poly(ether ether ketone)s (PEEK) and poly(ether sulfone)s (PSU) was carried out successfully by using phosphorous‐containing aromatic diols instead of bisphenol A in the usual synthesis procedure. The molecular weights of the P‐PEEKs and P‐PSUs obtained reflect both the influence of the different halogen components used and the lower thermal stabilities of the phosphorous‐containing diols compared to bisphenol A. However, polymers with sufficient molecular weights could be obtained, having interestingly high Tgs, high thermal stabilities as well as modified flame retardance properties depending on the diol type incorporated.

Phosphorus‐Containing Polysulfones

“…Phosphorus-modified polysulfones with side bulky groups were soluble in polar-aprotic solvents (N-methyl-2-pyrrolidone, dimethylacetamide, dimethylformamide), but also in some nonpolar solvents as chloroform and 1, 4 dioxane [48]. The solubility increases only in a certain extent with the substitution degree.…”

“…Recently, it was proposed to incorporate phosphorus-containing diols into the polymer to further improve the fire behaviour of poly(ether sulfone) [48] and hence to use these new materials not only as toughness modifier for epoxy resins, but also as flame retardant at the same time. It should be noted that fire retardants containing phosphorus -regardless of whether an additive or reactive approach is used, show different mechanisms in the condensed and gas phase [115].…”

“…Diols can contain phosphorus in main chain position or incorporate in a phenanthrene-type ring as side chain. These different phosphorus-containing diols form aromatic polyethers by polycondensation with dihalogen-substituted aromatic sulfones [48]. The chain structure of the polymer (aromatic or aliphatic) and the position of phosphorus in the chain influence the polymer properties (electroluminescence [49,50], flame retardancy [51], liquid crystal properties [52]).…”

High‐Tg Transparent Poly(ether sulfone)s Based on Phosphinated Bisphenols

“…It has been reported that incorporating asymmetric pendants [17][18][19][20][21][22][23][24][25][26][27][28][29][30] into polymers can enhance the T g of polymers due to restricted segmental mobility. As a result, preparation of bisphenol monomers with bulky pendant for poly(ether sulfone)s may be a route for high-T g poly(ether sulfone)s. Herein, three poly(ether sulfone)s…”

Structure and Properties of Phosphorous‐Containing Thermotropic Liquid‐Crystalline Aliphatic–Aromatic Copolyesters

“…[13][14][15][16] The utilization of monomers that contain phosphorus units, such as 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), which possesses a polar P¼O group and a bulky structure, resulted in polymers with good solubility and decreased birefringence. [17][18][19][20][21][22][23] Previously, thermotropic polyesters and copolyesters were prepared by the polycondensation reaction of a diacid chloride, namely terephthaloyl-bis(4-oxybenzoyl-chloride), with 2-(6-oxido-6H-dibenzhc,eih1,2ioxaphosphorin-6-yl)-1,4-benzenediol, or with an equimolar amount of the latter and an aromatic or aliphatic diol. [24,25] The polymers had a good thermal stability and some of them exhibited a thermotropic behavior.…”