The present invention relates to modified fluorinated poly(arylene ether ketone)s that can be crosslinked to produce high performance thermoset useful for semiconductor application with low dielectric constant. The present invention also relates to a method for manufacturing said modified fluorinated poly(arylene ether ketone)s prepared via chemical transformation of carbonyl groups to hydroxyl pendant groups and following thermal curing.

A block copolymer, an ion-exchange membrane including the block copolymer and a method of preparing the block copolymer are provided. The block copolymer may include a hydrophobic repeating unit and a hydrophilic repeating unit.

Disclosed herein is a method of manufacturing a membrane electrode assembly (MEA) including directly depositing a liquid suspension containing a platinum precursor onto an ionically conductive membrane (e.g., proton-exchange membrane) that, when the platinum precursor deposit layer is reduced, provides a layer that will scavenge hydrogen that has diffused back through the membrane due to cell stack pressure differential.

A composite polymer electrolyte membrane has a high proton conductivity even under low-humidity, low-temperature conditions, a reduced dimensional change rate, a high mechanical strength and high chemical stability, and produces a solid polymer electrolyte fuel cell with a high output and high physical durability, a membrane electrode assembly, and a solid polymer electrolyte fuel cell containing the same. This composite polymer electrolyte membrane contains a composite layer composed mainly of a polyazole-containing nanofiber nonwoven fabric (A) and an ionic group-containing polymer electrolyte (B), the polyazole-containing nanofiber nonwoven fabric (A) being basic.

Polyaryletherketones are produced which are end-capped with a phenylethynyl-containing moiety. The end-capped material, having a relatively low molecular weight, may be subjected to a thermal cycle to produce a higher molecular weight material having excellent mechanical properties, a relatively high level of crystallinity and acceptable Tm and Tg

An oxymethylene copolymer resin composition, which includes (i) an oxymethylene copolymer, (ii) a derivative of an aryl boron fluoride compound, and (iii) a layered double hydroxide; and a method for producing the same.

The present application relates to the technical field of polyaryletherketone, and discloses a preparation method for a coating material containing high-temperature self-crosslinking fluorine-containing polyaryletherketone. A molecular chain of the high-temperature self-crosslinking fluorine-containing polyaryletherketone contains two crosslinking groups of a styrene group and a thioether group, and its structural formula is:

##STR00001##

Herein, the value range of m is 1-40%, the value range of n is 60-99%, and R is a group that removes a phenolic hydroxyl group from hexafluorobisphenol A. In the high-temperature curing process after film coating, the crosslinking reaction occurs to form a crosslinked polymer coating layer, thereby a coating surface with good moisture and heat resistance, wear resistance, and low friction coefficient is formed.

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.sup.1 and R.sup.2 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 method for manufacture of PEEK-PEDEK copolymers is described herein, along with copolymers formed by the method and their use. The method includes a nucleophilic polycondensation of a mixture of dihydroxybenzene and dihydroxybiphenyl with 4,4-dihalobenzophenone in a reaction mixture comprising sodium carbonate and potassium carbonate, in an aromatic sulfone solvent, at a reaction temperature rising to a temperature from 280? C. to 330? C. immediately prior to the addition of a reaction-stopping salt, such as LiCl or Li.sub.2SO.sub.4, to the reaction mixture. Further organic dihalide is subsequently added to the reaction mixture for end-capping of the copolymer. The resulting copolymer has reduced chain branching and reduced melt viscosity at low shear rate compared to prior art copolymer of comparable molecular mass.

A polyaryl ether ether composition(C) and methods of uses thereof are herein disclosed. The composition comprises a polymer blend [blend (B)] consisting of: a first polyaryl ether ketone (PAEK-1)and a second polyaryl ether ketone (PAEK-2), wherein the (PAEK-1) is crystalline and exhibits a melting temperature T.sub.m of 330 C. or higher and the (PAEK-2) is either amorphous or crystalline and exhibits a melting temperature T.sub.m of 315 C. or lower and wherein the (PAEK-1) constitutes more than 0% wt of blend (B). Composition (C) can be used in particular for the manufacture of coated metal surfaces, in particular for the coating of wires or of (part of) electronic devices.