A composition and a method for preparing a polymer composite article. The composition comprises (A) a filler in an amount of from 10 to 90 wt. The composition also comprises (B) a polymer in an amount of from 10 to 90 wt. %, wherein the (B) polymer is selected from polyolefins, polyamides, polyesters, or combinations thereof. Further, the composition comprises (C) an organopolysiloxane in an amount of from greater than 0 to 10 wt. %; the (C) organopolysiloxane having at least one silicon-bonded hydroxyl group and a viscosity of from 1,000 to 60,000 mPa.Math.s at 25 C. The ranges for components (A)-(C) arc based on the total weight of components (A), (B) and (C) in the composition.

A bioink is described. The bioink comprises coral particles and biocompatible polymer, wherein the concentration of coral particles in the bioink is 25 to 85 weight % of the total weight of the bioink.

The disclosure is directed at an extrusion printable cellulose-based nanocomposite and method of making same. In some embodiments, the disclosure is directed at a cellulose-based ink or nanocomposite that can be used by a three-dimensional (3D) extrusion-type printer to fabricate or print a 3D object. In some embodiments, the disclosure includes cellulose acetate (CA) that is dissolved in a solvent or solvent mixture to produce a CA solution to which cellulose nanocrystals (CNCs) are then added to prepare the ink or nanocomposite of the disclosure.