To provide a highly heat resistant flame retardant. A polymer having repeating units represented by the following formula (1), which has a weight average molecular weight as calculated as standard polystyrene of at least 6,000: ##STR00001##
wherein R is a C.sub.1-6 alkylene group, —S— or —SO.sub.2—.

Disclosed is a composition including at least one polymer, wherein the polymer is in the form of a powder, and wherein the polymer includes at least one thermoplastic polymer. The thermoplastic polymer is selected from at least one polyaryletherketone and/or a copolymer and/or a block-copolymer and/or a polymer blend thereof, wherein the composition has a melt volume rate (MVR) of at least 5 cm.sup.3/10 min and a process of manufacturing and a use thereof. Also disclosed are a process for the manufacture of a construction element and the construction element thereof.

The present specification relates to a compound comprising an aromatic ring, a polyelectrolyte membrane comprising the same, a membrane-electrode assembly comprising the polyelectrolyte membrane, a fuel cell comprising the membrane-electrode assembly, and a redox flow battery comprising the polyelectrolyte membrane.

A composition comprising: (i) a polymeric material (A) having a repeat unit of formula

(O-Ph)n-O-Ph-O-Ph-CO-Ph-   I and a repeat unit of formula

—O-Ph-Ph-O-Ph-CO-Ph-   II wherein Ph represents a phenylene moiety and n represents 0 or 1; and (ii) a polymeric additive comprising one or more of. (a) a polycarbonate; and/or (b) a polymeric material (B) which includes a repeat unit of general formula

##STR00001## wherein R′ and R′″ independently represent a hydrogen atom or an optionally-substituted (preferably un-substituted) alkyl group, and R.sup.3 and R.sup.4 independently represent a hydrogen atom or an optionally-substituted alkyl group, an anhydride-containing moiety or an alkyloxycarbonyl-containing moiety.

A blend comprising: (i) a polymeric material (A) having a repeat unit of formula

—O—Ph—O—Ph—CO—Ph—  I

and a repeat unit of formula

—O—Ph—Ph—O—Ph—CO—Ph—  II

wherein Ph represents a phenylene moiety; and (ii) a polymeric material (B) having a repeat unit of formula (XX)

##STR00001##

wherein t1 and w1 independently represent 0 or 1 and v1 represents 0, 1 or 2.

Described here are blocky PEEK copolymers and corresponding synthesis methods. It was surprisingly found that synthesis of blocky PEEK copolymers in a non-solvent environment with respect to PEEK produced blocky PEEK copolymers with high degrees of functionalization and crystallinity. The blocky PEEK copolymers had an increased blocky structure, relative to corresponding PEEK copolymer synthesized with other known methods. Moreover, membranes formed from the blocky PEEK polymers are particularly desirable in fuel cell applications. For example, the membranes formed from the blocky PEEK polymers had surprisingly large ion conductivities as well as significantly improved chemical and thermal resistance, at least in part, to the improved functionalization and crystallinity.

Described here are blocky PEEK copolymers and corresponding synthesis methods. It was surprisingly found that synthesis of blocky PEEK copolymers in a non-solvent environment with respect to PEEK produced blocky PEEK copolymers with high degrees of functionalization and crystallinity. The blocky PEEK copolymers had an increased blocky structure, relative to corresponding PEEK copolymer synthesized with other known methods. Moreover, membranes formed from the blocky PEEK polymers are particularly desirable in fuel cell applications. For example, the membranes formed from the blocky PEEK polymers had surprisingly large ion conductivities as well as significantly improved chemical and thermal resistance, at least in part, to the improved functionalization and crystallinity.

A method for manufacturing 1,4-bis(4-phenoxybenzoyl)benzene, including: reacting terephthaloyl chloride with diphenyl ether in a reaction solvent and in the presence of a Lewis acid, so as to obtain a product mixture comprising a 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex; putting the product mixture in contact with a protic solvent, so as to obtain a first phase containing the Lewis acid and a second phase containing 1,4-bis(4-phenoxybenzoyl)benzene; subjecting at least the second phase to a solid/liquid separation step by centrifugal filtration, so as to recover solid 1,4-bis(4-phenoxybenzoyl)benzene.

The present specification relates to a block polymer and a polymer electrolyte membrane including the same, a membrane-electrode assembly including the polymer electrolyte membrane, a fuel cell including the membrane-electrode assembly and a redox flow battery including the polymer electrolyte membrane.

A method for treating a shear-thinning residue composition deriving from the synthesis of an aryl ether ketone, the residue composition including a liquid fraction and solid residues, the method including the steps of: passing said shear-thinning residue composition through a shear-generating evaporating device, between a rotating part and a stationary part; and recovering a condensed liquid fraction and separately recover concentrated solid residues.