Methods for processing three-dimensional printed objects using microwave radiation

A method comprising:

• depositing a printing composition in a layer-by-layer deposition process to form a three-dimensional printed object;
• wherein the printing composition comprises a solidifiable matrix and a plurality of carbon nanostructures dispersed in the solidifiable matrix, the carbon nanostructures comprising a plurality of carbon nanotubes that are branched, crosslinked, and share common walls with one another;
• placing a microwave transmission line in proximity to the printed object;
• establishing a standing wave in the microwave transmission line;
• and
• after depositing the printing composition to form the printed object, contacting the standing wave with the printed object at one more locations, thereby heating the carbon nanostructures at the one or more locations and promoting consolidation of the printing composition within the printed object.

A method comprising:

• providing a three-dimensional printed object, the printed object being formed from a printing composition comprising a solidifiable matrix and a microwave absorber dispersed in the solidifiable matrix;
• and
• applying a focused input of microwave radiation to the printed object at one or more locations, thereby heating the microwave absorber at the one or more locations;
• wherein heating of the microwave absorber continues until the solidifiable matrix decomposes at the one or more locations.