The present disclosure relates to a composition that includes

##STR00001##

where R.sub.1 and R.sub.2 include at least one of a hydrogen, a hydroxyl group, and/or an alkyl group, R.sub.3 and R.sub.4 include at least one of hydrogen, a hydroxyl group, an alkyl group, and/or a ketone, and 1n2000.

The present disclosure relates to a composition that includes

##STR00001##

where R.sub.1 and R.sub.2 include at least one of a hydrogen, a hydroxyl group, and/or an alkyl group, R.sub.3 and R.sub.4 include at least one of hydrogen, a hydroxyl group, an alkyl group, and/or a ketone, and 1n2000.

The present invention is directed to material extrusion additive manufacturing processes, including fused filament fabrication, used to manufacture improved parts, devices, and prototypes using polyetherketoneketones (PEKK) and polyetheretherketones (PEEK). Using the improved processes of the invention, PEKK or PEEK polymer readily is 3D printed by FFF such that it crystallizes slowly enough during deposition for the resulting part to remain mostly or substantially amorphous during printing and thus have low percentage and/or more uniform shrinkage per layer and little to no warping from the base during print, and yet fast enough so that the resulting part crystallizes in post-print processing without substantial or any loss of its printed structure.

The invention relates to polyaryl ether ketones with low contents of residual materials, whether they are residual monomers or solvents of the synthetic process.

The invention relates to polyaryl ether ketones with low contents of residual materials, whether they are residual monomers or solvents of the synthetic process.

Methods for producing spatial objects are disclosed. The methods generally include printing a spatial object, in an amorphous phase, using a three-dimensional (3D) printer and a printing material that consists essentially of polyaryletherketones. The methods further entail placing the spatial object in a container and submerging the spatial object in a suitable charging material. Next, vibrations are applied to the container that includes the spatial object and charging material. The container, charging material, and spatial object are then heated until the spatial object transitions into a semi-crystalline phase (at which point the spatial object can be removed from the container and charging material).

The invention relates to heat treatment of polymorphic semicrystalline or crystallizable polymers to increase the content of the highest melting crystalline form. Such heat treatment results in a polymer powder that has a consistent, uniform melting range, improved flow and improved durability of the powder particle size for applications that require powder flow at elevated temperatures. In addition to improved powder properties, the articles produced from the powders also exhibit better physical properties in both appearance and in mechanical properties. Thus the invention also includes polymer powders and articles produced by the described processes.

The invention relates to heat treatment of polymorphic semicrystalline or crystallizable polymers to increase the content of the highest melting crystalline form. Such heat treatment results in a polymer powder that has a consistent, uniform melting range, improved flow and improved durability of the powder particle size for applications that require powder flow at elevated temperatures. In addition to improved powder properties, the articles produced from the powders also exhibit better physical properties in both appearance and in mechanical properties. Thus the invention also includes polymer powders and articles produced by the described processes.

The present invention disclosed a novel squaraine linked metalloporphyrin based 2D-sheet polymer catalyst of formula (I), process for preparation thereof and use of said catalyst for efficient photo- and electro-catalytic splitting of water.

A method for purifying a material, the method comprising: a step of preparing a solution comprising a solvent and at least one material selected from the group consisting of a compound represented by the following formula (1A) and a resin having a structure represented by the following formula (2A); and a step of purification in which the solution is passed through a filter:

##STR00001## wherein, X represents an oxygen atom, a sulfur atom, a single bond, or non-crosslinked state; R.sup.a represents a 2n-valent group having 1 to 40 carbon atoms or a single bond; each R.sup.b independently represents one of various functional groups; each m is independently an integer of 0 to 9; n is an integer of 1 to 4; and each p is independently an integer of 0 to 2; provided that at least one R.sup.b represents a group comprising one selected from a hydroxyl group and a thiol group, and all m cannot be 0 at the same time;

##STR00002## wherein, X, R.sup.a, R.sup.b, n and p are the same as defined in the formula (1A); R.sup.c represents a single bond or an alkylene group having 1 to 40 carbon atoms; each m.sup.2 is independently an integer of 0 to 8; provided that at least one R.sup.b represents a group comprising one or more selected from a hydroxyl group and a thiol group, and all m.sup.2 cannot be 0 at the same time.