Partial-cure bonding of silicones through temporary inhibition
A polymer article is provided that includes a first silicone component formed from (i) a first siloxane polymer comprising a first plurality of hydride-functional groups and (ii) a second siloxane polymer comprising a first plurality of vinyl-functional groups. The polymer article also includes a second silicone component formed from (i) a third siloxane polymer comprising a second plurality of hydride-functional groups and (ii) a fourth siloxane polymer comprising a second plurality of vinyl-functional groups. Lastly, the polymer includes a contact interface, between the first and second silicone components, comprising chemical crosslinks between the first siloxane polymer and the fourth siloxane polymer. Notably, a tensile strength of the polymer article across the contact interface is substantially equal to a tensile strength of the first silicone component or the second silicone component alone.
1. A process of making a polymer article, the process comprising:
providing, obtaining, or receiving a flexible film comprising a gelled or partially cured resin mixture comprising a first polymer component comprising a plurality of —CH 2 —CH 2 —Si— groups, a second polymer component comprising a plurality of —CH═CH 2 groups, and a third polymer component comprising a plurality of Si-H groups, wherein the stoichiometric ratio of —CH 2 —CH 2 —Si—:—CH═CH 2 :Si—H=x 1 : y 1 : z 1 , wherein x 1 ranges from about 0.1 to about 0.9, x 1 +y 1 =1, and x 1 +z 1 ranges from 1 to about 1.5,
shaping the flexible film by vacuum bagging, vacuum forming, thermoforming, and/or compression molding, and
subjecting the shaped film comprising the gelled or partially cured resin mixture to a temperature higher than room temperature.
2. The process of claim 1 , wherein the temperature is lower than 100° C.
3. The process of claim 1 , wherein x 1 ranges from about 0.1 to about 0.25, from about 0.1 to about 0.5, or from about 0.1 to about 0.75.
4. The process of claim 1 , wherein x 1 is selected from about 0.1, about 0.2, about 0.3, about 0.4, about 0.5, about 0.6, about 0.7, about 0.8, and about 0.9.
5. The process of claim 1 , wherein x 1 +z 1 ranges from 1 to about 1.1, from 1 to about 1.15, from 1 to about 1.15, from 1 to about 1.2, or from 1 to about 1.25.
6. The process of claim 1 , wherein the gelled or partially cured resin mixture, further comprises a metal catalyst.
7. The process of claim 6 , wherein the metal catalyst is platinum.
8. The process of claim 1 , wherein the gelled or partially cured resin mixture, further comprises an inhibitor.
9. The process of claim 8 , wherein the concentration of the inhibitor is between 0.0001% and 0.1% by weight.
10. The process of claim 8 , wherein the inhibitor is a hydroperoxide compound.
11. The process of claim 1 , wherein the shaping of the flexible film is by thermoforming.
12. The process of claim 1 , wherein the flexible film comprising the gelled or partially cured resin mixture is topographically conformed to a 3D surface, and/or wherein the flexible film comprising the gelled or partially cured resin mixture is stretched.
13. The process of claim 1 , wherein the shaping of the flexible film is by vacuum bagging.
14. The process of claim 1 , wherein the shaping of the flexible film is by vacuum forming.
15. The process of claim 1 , wherein the shaping of the flexible film is by compression molding.