3D printed silicone double networks

1. A polymer composition comprising:

a blended resin having a viscosity below 10 pascal-seconds before exposure to actinic radiation, the blended resin including:

a first base component that is photocurable, wherein the first base component comprises (i) a first siloxane polymer comprising a plurality of thiol groups and (ii) a second siloxane polymer comprising a plurality of functional groups with unsaturated carbon-carbon bonds;

a photoinitiator;

a second base component that is condensation curable; and

a catalyst,

wherein the first base component is between 10% to 60% by weight of the blended resin, and

wherein the second base component includes a third siloxane polymer comprising a plurality of silanol groups.

2. The composition of claim 1 , wherein the second base component includes a plurality of crosslinkable groups distinct from the plurality of thiol groups and the plurality of functional groups with unsaturated carbon-carbon bonds of the first base component.

3. The composition of claim 2 , wherein:

during polymerization of the first base component, the plurality of thiol groups and the plurality of functional groups with unsaturated carbon-carbon bonds do not compete with the plurality of crosslinkable groups to form chemical crosslinks.

4. The composition of claim 2 , wherein exposing the blended resin to actinic radiation causes the plurality of thiol groups and the plurality of functional groups with unsaturated carbon-carbon bonds to form a cross-linked primary polymer network.

5. The composition of claim 4 , wherein the catalyst causes the plurality of crosslinkable groups of the second base component to form a cross-linked secondary polymer network, distinct from the cross-linked primary polymer network.

6. The composition of claim 1 , wherein:

the blended resin is configured to be deposited by a print head; and

the first base component of a deposited layer is configured to at least partially polymerize into a primary polymer network by exposing the deposited layer to actinic radiation.

7. The composition of claim 1 , wherein the second siloxane polymer comprises a plurality of vinyl groups.

8. The composition of claim 1 , wherein the first base component further includes a plurality of first siloxane polymer components and/or a plurality of different second siloxane polymer components.

9. The composition of claim 8 , wherein the second base component has less than 1% by weight of vinyl groups and/or thiol groups to minimize inter-network crosslinking with the first base component during polymerization.

10. The composition of claim 1 , wherein the first siloxane polymer and/or the second siloxane polymer has a molecular weight below 500,000 daltons.

11. The composition of claim 1 , wherein the first siloxane polymer has a mole percent of thiol groups between 2% and 5%.

12. The composition of claim 1 , wherein:

the blended resin further comprises one or more non-reactive diluents, and

the one or more non-reactive diluents are up to 80% by weight of the blended resin.

13. The composition of claim 1 , wherein:

the blended resin further comprises one or more solid particles, and

the one or more solid particulates are up to 50% by weight of the blended resin.