Volumetric additive manufacturing using cycloolefin resins

A method of making a composition of cycloolefin resin including dicyclopentadiene (DCPD), comprising:

• mixing dicyclopentadiene (DCPD) and ethylidene norbornene (ENB) to provide a mixture of DCPD:
• ENB;
• preparing a catalyst solution by mixing (1,3-dimesitylimidazolidin-2-ylidene)dichloro(2-((2-ethoxy-2-oxoethylidene)amino)benzylidene)ruthenium(II) (HeatMet), benzil, and ethyl 4-(dimethylamino)benzoate to provide a catalyst mixture, and adding tetrahydrofuran (THF) to form the catalyst solution;
• and
• adding a measured quantity of the catalyst solution to a measured quantity of the DCPD:ENB mixture to provide the composition of cycloolefin resin including DCPD.

A method of recycling a cured material including dicyclopentadiene (DCPD), comprising:

• placing the cured material on a flask with a stir bar;
• adding a quantity of toluene containing a catalyst to obtain a solution;
• sparging the solution with nitrogen gas;
• heating the flask to 90° C. for about 12 hours;
• adding ethyl vinyl ether to the flask to quench the catalyst;
• adding 100 mg Quadrapure TU macroporous particle to the flask to further remove the catalyst and color to obtain a mixture;
• filtering the mixture from cold methanol to afford a white solid as the recyclate;
• and
• drying the recyclate by using vacuum filtration to recover dry recyclate.