Mixed solvent process for preparing structured organic films
View Patent ↗A mixed solvent process for preparing structured organic film comprising a plurality of segments and a plurality of linkers arranged as a covalent organic framework, wherein the structured organic film may be a multi-segment thick structured organic film.
1. A process for preparing a structured organic film (SOF) comprising:
(a) preparing a liquid-containing reaction mixture comprising:
a first solvent,
a second solvent, and
a plurality of molecular building blocks each comprising a segment and functional groups;
(b) depositing the reaction mixture as a wet film; and
(c) promoting a change of the wet film and forming a dry SOF.
2. The process of claim 1 , wherein the dry SOF comprises a plurality of segments and a plurality of linkers arranged as a covalent organic framework (COF), and the dry SOF is a substantially defect-free film.
3. The process of claim 1 , wherein the second solvent has a lower boiling point than said first solvent.
4. The process of claim 3 , wherein the second solvent has a boiling point of less than about 100° C.
5. The process of claim 4 , wherein the boiling point of the first solvent exceeds the boiling point of the second solvent by about 1° C. to about 100° C.
6. The process of claim 1 , wherein the boiling point difference between the first and the second solvent is from about 0° C. to about 150° C.
7. The process of claim 1 , wherein the ratio of the first solvent to the second solvent ranges from about 1:20 to about 20:1 by volume.
8. The process of claim 1 , wherein promoting the change of the wet film and forming the dry SOF comprises:
heating the wet film above the boiling point of the reaction mixture to form the dry SOF film.
9. The process of claim 1 , wherein promoting the change of the wet film and forming the dry SOF comprises:
heating the wet film above the boiling point of the second solvent while substantially leaving the first solvent and, after removing the second solvent, removing the first solvent to form the dry SOF film.
10. The process of claim 2 , wherein the plurality of segments consists of segments having an identical structure and the plurality of linkers consists of linkers having an identical structure, wherein the segments that are not at the edges of the dry SOF are connected by linkers to at least three other segments.
11. The process of claim 2 , wherein the plurality of segments comprises at least a first and a second segment that are different in structure, and
the first segment is connected by linkers to at least three other segments when it is not at the edge of the dry SOF.
12. The process of claim 1 , wherein the dry SOF has less than 10 pinholes, pores or gaps greater than about 250 nanometers in diameter per cm 2 .
13. The process of claim 1 , further comprising promoting a reaction of the functional groups, wherein no byproduct is formed as a result of the reaction of the functional groups.
14. The process of claim 1 , wherein the dry SOF is formed after the wet film is exposed to oven drying or infrared radiation (IR) drying or oven drying and IR drying.
15. The process of claim 1 , wherein the reaction mixture is deposited as a wet film on a substrate selected from the group consisting of a polymer, a paper, a metal, a metal alloy, a metal oxide, a metal chalcogenide, and an SOF.
16. The process of claim 15 , further comprising removing the dry SOF from the substrate to obtain a free-standing SOF.
17. The process of claim 1 , wherein the liquid-containing reaction mixture further comprises a secondary component.
18. The process of claim 1 , further comprising promoting a reaction of the functional groups, wherein a volatile byproduct is formed as a result of the reaction of the functional groups.
19. The process of claim 1 , wherein the dry SOF comprises a plurality of segments including at least a first segment type, a plurality of linkers including at least a first linker type arranged as a covalent organic framework (COF), wherein the first segment type and/or the first linker type comprises at least one atom that is not carbon.
20. A process for preparing a composite structured organic film comprising:
(a) preparing a liquid-containing reaction mixture comprising:
a first solvent,
a second solvent,
a secondary component, and
a plurality of molecular building blocks;
(b) depositing the reaction mixture as a wet film on a substrate; and
(c) promoting a change of the wet film and forming a dry SOF; wherein the secondary component is not covalently bound to the dry SOF.
21. The process of claim 20 , wherein the dry SOF comprises a plurality of segments including at least a first segment type, a plurality of linkers including at least a first linker type arranged as a covalent organic framework (COF), wherein the first segment type and/or the first linker type comprises at least one atom that is not carbon.
22. A process for preparing a structured organic film including an added functionality comprising:
(a) preparing a liquid-containing reaction mixture comprising:
a first solvent,
a second solvent, and
a plurality of molecular building blocks each comprising a segment and functional groups, wherein the molecular building blocks are selected to provide the added functionality in the SOF;
(b) depositing the reaction mixture as a wet film on a substrate; and
(c) promoting a change of the wet film and forming a dry SOF possessing an added functionality.
23. The process of claim 22 , wherein the dry SOF comprises a plurality of segments including at least a first segment type, a plurality of linkers including at least a first linker type arranged as a covalent organic framework (COF), wherein the first segment type and/or the first linker type comprises at least one atom that is not carbon.