Hexahydrotriazine hybrid coatings for sulfur capture
Methods and compositions related to chemically active hexahydrotriazine inorganic-organic hybrid coatings are described. The coatings have affinity for sulfur compounds, and thus may bind or capture sulfur containing contaminants and gases. The coatings have organosilicon containing functional groups and segments, and may also contain silica particles, which cumulatively enhances adhesion, abrasion resistance and further provides steric barriers to gaseous diffusion. The coatings have utility as protective barrier coatings in the field of electronics.
1. An electronic article, comprising:
a substrate comprising electronic components; and
a coating disposed over and upon the substrate, wherein the coating contains polyhexahydrotriazine bonded to silicon containing groups or hexahydrotriazine bonded to silicon containing groups, wherein the silicon containing groups are selected from the group consisting of organosilicon groups, silane groups, alkoxy silane groups, and polysiloxane groups.
2. The electronic article of claim 1 , wherein the coating has a sulfur-reactive surface.
3. The electronic article of claim 2 , wherein the coating reacts with a sulfur compound to form a sulfur-adduct surface on the coating.
4. The electronic article of claim 3 , wherein the sulfur compound is selected from the group consisting of: elemental sulfur, inorganic sulfur compounds, hydrogen sulfides, sulfur oxides, organic sulfur compounds, thiols, and alkane thiols.
5. The electronic article of claim 3 , wherein a sulfur-adduct of the sulfur-adduct surface is selected from the group consisting of monothiazines, dithiazines, thioaminals, and polythioaminals.
6. The electronic article of claim 3 , wherein the sulfur-adduct surface has a thickness from 1 nm to 10 microns.
7. The electronic article of claim 1 , wherein the polysiloxane groups comprise polydimethylsiloxane.
8. The electronic article of claim 1 , wherein the coating comprises particles.
9. The electronic article of claim 8 , wherein the coating comprises particles selected from the group consisting of: metal oxides, metals, intermetallics, ceramics, carbides, nitrides, and borides.
10. The electronic article of claim 9 , wherein an average diameter of the particles is 10 nm to 10 microns.
11. The electronic article of claim 9 , wherein the particles are silica particles.
12. The electronic article of claim 11 , wherein a weight percent of the silica particles is from 0.1% to 30% by weight percent of coating.
13. The electronic article of claim 11 , wherein the silica particles are foci for coating crosslinks.
14. The electronic article of claim 1 , wherein the coating is chemically bonded to the substrate.
15. The electronic article of claim 14 , wherein the coating is chemically bonded to the substrate by at least one molecular segment comprising a surface-O—Si—R segment, wherein R is an organic group that is a polymer group, and wherein the polymer group has a polymer repeat unit comprising at least 5 repeat units and at least one hexahydrotriazine.
16. The electronic article of claim 14 , wherein the coating is chemically bonded to the substrate by at least one of the silicon containing groups.