A method of manufacturing a semi-crystalline article from at least one pseudo-amorphous polymer including a poly aryl ether ketone, such as PEKK, including a softening step, wherein the at least one pseudo-amorphous polymer is heated to a temperature above its glass transition temperature to soften the polymer, and a crystallization step, wherein the at least one pseudo-amorphous polymer is heated to a temperature between its glass transition temperature and melting temperature, the pseudo-amorphous polymer being placed on a mold during either the softening step or the crystallization step before at least some crystallization takes place. The method results in articles demonstrating increased opacity, increased crystallinity, increased thermal resistance, improved chemical resistance, and improved mechanical properties over articles formed by traditional thermoforming processes.

A semicrystalline polyarylethersulfone (PAES) useful for additive manufacturing may be made by a method comprising: dissolving an amorphous polyarylethersulfone in a polar aprotic halogenated hydrocarbon solvent at a temperature adequate to effectively form a solution, and subsequently and spontaneously bring about reprecipitation of a semicrystalline polyarylethersulfone from the solution. The semicrystalline polyarylethersulfone may have a crystallinity of at least 30% by weight. The semicrystalline PAES, upon being heated, melting and uniting together in layers during additive manufacturing cools without substantially recrystallizing, allows for deformation-free articles to be formed having low residual stress.

A cleaned biobased polyoxyalkylene glycol polyol, wherein the cleaned biobased polyoxyalkylene glycol polyol is completely primary hydroxyl-tipped or end-grouped, further wherein the cleaned biobased polyoxyalkylene glycol polyol comprises less than 15 ppm sodium and potassium metals, and further wherein the cleaned biobased polyoxyalkylene glycol polyol comprises less than 0.5% water by weight.

A cleaned biobased polyoxyalkylene glycol polyol, wherein the cleaned biobased polyoxyalkylene glycol polyol is completely primary hydroxyl-tipped or end-grouped, further wherein the cleaned biobased polyoxyalkylene glycol polyol comprises less than 15 ppm sodium and potassium metals, and further wherein the cleaned biobased polyoxyalkylene glycol polyol comprises less than 0.5% water by weight.

A process for recovering monomers and solvent present in a waste stream including the steps of: (a) providing a waste feed stream containing monomers, solvent and impurities; (b) subjecting the waste feed stream of step (a) to a separation process under conditions for separating the monomers and solvent from the impurities of the waste stream; (c) recovering the monomers and solvent in one or more streams; and (d) passing the one or more of the monomer and solvent streams from step (c) to further processing.

The present disclosure relates to process of obtaining a powder of poly(ether ketone ketone) (PEKK) polymer, comprising grinding a PEKK polymer at a temperature comprised between 60° C. and 85° C., wherein the powder has a d.sub.50-value comprised 0 between 40 pm and 60 pm (as measured by laser scattering in isopropanol). The present invention also relates to a PEKK powder presenting such particle size distribution (PSD), obtained by the grinding method of the present invention.

The present disclosure relates to process of obtaining a powder of poly(ether ketone ketone) (PEKK) polymer, comprising grinding a PEKK polymer at a temperature comprised between 60° C. and 85° C., wherein the powder has a d.sub.50-value comprised 0 between 40 pm and 60 pm (as measured by laser scattering in isopropanol). The present invention also relates to a PEKK powder presenting such particle size distribution (PSD), obtained by the grinding method of the present invention.

A process for preparing a copolymer polyol containing a reduced content of residual monomers and volatiles including the steps of: (a) providing at least one copolymer polyol containing a first initial content of residual monomers and volatiles; (b) providing at least one molecular sieve adsorbent; (c) contacting the at least one copolymer polyol with the at least one molecular sieve adsorbent for a period of time and at a temperature sufficient for the at least one molecular sieve adsorbent to adsorb at least a portion of the first initial content of residual monomers and volatiles present in the at least one copolymer polyol to reduce the first initial content of residual monomers and volatiles of the at least one copolymer polyol to form at least one copolymer polyol containing a second reduced content of residual monomers and volatiles; and (d) separating the at least one molecular sieve adsorbent containing a portion of the first initial content residual monomers and volatiles from the at least one copolymer polyol to form at least one copolymer polyol containing a second reduced content of residual monomers and volatiles.

The disclosure describes a pressure containment component of a pressurized system of an aircraft. The pressure containment component includes a dimensionally complex monolithic body defining an inlet and an outlet. The monolithic body includes a polyether ether ketone (PEEK) matrix and carbon fibers distributed throughout the PEEK matrix. The monolithic body is configured to contain a pressure greater than or equal to about 20 kPa from the pressurized system. The disclosure also describes a method of forming a pressure containment component of a pressurized system of an aircraft. The method includes injecting a thermoplastic mixture into a mold for a monolithic body of the component. The thermoplastic mixture includes a molten PEEK and carbon fibers distributed throughout the molten PEEK. The method includes cooling the thermoplastic mixture to form the monolithic body.

A cleaned biobased polyoxyalkylene glycol polyol with an oxyethylene content of at least 40 mole percent, constituting 31.80 to 67.95 percent biogenic carbon content by weight, having less than 15 ppm combined sodium and potassium metals, and having less than 0.5 percent water by weight.