A method of manufacturing a shape-memory article includes combining a polymer with a particulate water soluble salt to form a mixture; molding the mixture to form a molded article; heating the molded article in the presence of oxygen, forming a sintered article comprising a crosslinked polymer; exposing the sintered article to water to remove the particulate water soluble salt from the sintered article, forming the shape-memory article, which is a porous foam comprising the crosslinked polymer.

Compounds and compositions are provided which are useful in additive printing, particularly additive printing techniques such as stereolithography (SLA) wherein a macromer is photopolymerized to form a manufactured article. Representative compounds comprise a polyaxial central core (CC) and 2-4 arms of the formula (A)-(B) or (B)-(A) extending from the central core, where at least one of the arms comprise a light-reactive functional group (Q) and (A) is the free-radical polymerization product from monomers selected from trimethylene carbonate (T) and -caprolactone (C), while (B) is the free-radical polymerization product from monomers selected from glycolide, lactide and p-dioxanone.

Compounds and compositions are provided which are useful in additive printing, particularly additive printing techniques such as stereolithography (SLA) wherein a macromer is photopolymerized to form a manufactured article. Representative compounds comprise a polyaxial central core (CC) and 2-4 arms of the formula (A)-(B) or (B)-(A) extending from the central core, where at least one of the arms comprise a light-reactive functional group (Q) and (A) is the free-radical polymerization product from monomers selected from trimethylene carbonate (T) and -caprolactone (C), while (B) is the free-radical polymerization product from monomers selected from glycolide, lactide and p-dioxanone.

An example of a multi-functional agent for three-dimensional (3D) printing includes carboxylated carbon nanotubes present in an amount ranging from about 0.5 wt % active to about 5.0 wt % active based on a total weight of the multi-functional agent; poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) present in an amount ranging from about 0.1 wt % active to about 0.8 wt % active based on the total weight of the multi-functional agent; a co-solvent; and a balance of water.

A water dispersible sulfopolymer for use as a material in the layer-wise additive manufacture of a 3D part made of a non water dispersible polymer wherein the water dispersible polymer is a reaction product of a metal sulfo monomer, the water dispersible sulfo-polymer being dispersible in water resulting in separation of the water dispersible polymer from the 3D part made of the non water dispersible polymer.