Granted Patent
B2
US 12,258,470 · App. 16/969,655 · Granted Mar 25, 2025
Chromogenic materials, methods of making chromogenic materials, and methods of use
Inventors:
Peng Jiang (Gainesville, FL); Ruochen Liu (Bryan, TX); Rao Fei (Boulder, CO); Wei Zhang (Gainesville, FL); Sin-Yen Leo (Gainesville, FL); Calen Leverant (Gainesville, FL); Helena Jiang (Gainesville, FL); Curtis Taylor (Gainesville, FL); Yifan Zhang (Gainesville, FL)
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Abstract
The present disclosure provides for porous polymer materials that include an ordered array of voids separated by a polymer framework. The porous polymer material can have a recovery state where the voids are in an uncollapsed state and iridescent color, and a deformed state having voids in a collapsed state that is non-iridescent or substantially transparent. The materials can have regions of both states simultaneously. Also described are methods for fabricating a polymer material as above, as well as chromogenic sensors including the polymer material. The sensors can have hidden anti-counterfeiting patterns, hydrophobic/oleophobic properties, and chromogenic transformation can be triggered by various stimuli such as solid target compounds, light energy, and more.
Claims (38)
1. A porous polymer material comprising an ordered array of voids, wherein a distance between at least two pairs of adjacent voids is substantially the same, wherein a polymer framework separates the voids;
wherein the porous polymer material has a recovery state, wherein the voids are in an uncollapsed state and the porous polymer material has the characteristic of having an iridescent color;
wherein the porous polymer material has a deformed state, wherein the voids are in a collapsed state and the porous polymer material has the characteristic of being either non-iridescent or substantially transparent; and
wherein the deformed state occurs when a solvent is evaporated from the porous polymer material causing the voids to collapse, and wherein when the recovery state occurs when the porous polymer material in the deformed state is exposed to an external stimulus causing the collapsed voids renew their uncollapsed state, wherein the external stimulus is selected from: a target compound or a laser illumination;
wherein the external stimulus is a target compound; and
wherein the target compound is selected from the group consisting of: uncured PDMS oligomer, a drug, Vitamin E, and lidocaine.
2. The porous polymer material of claim 1 , wherein the porous polymer material comprises a first region and a second region, wherein the porous polymer material further comprises additive particles in the polymer framework.
3. The porous polymer material of claim 1 , wherein the polymer framework comprises: a co-polymer of ethoxylated trimethylolpropane triacrylate (ETPTA) and polyethylene glycol diacrylate (PEGDA), a blend of an aliphatic polyester/polyether-based trifunctional urethane acrylate oligomer and blended with tripropylene glycol diacrylate (25 wt %) with ratio of about 5% to 50%, or a combination thereof.
4. The porous polymer material of claim 1 , wherein the porous polymer material has a thickness of about 1 micrometer to 300 micrometers.
5. The porous polymer material of claim 1 , wherein the porous polymer material comprises a first region and a second region, wherein the porous polymer material further consists of a filler polymer in voids of the second region, wherein the filler polymer causes the voids of the second region to irreversibly remain in the uncollapsed state.
6. The porous polymer material of claim 5 , wherein the filler polymer comprises uncured oligomers and plasticizers, wherein the filler polymer swells the collapsed voids, leading to a chromogenic response of the porous polymer composite material.
7. The porous polymer material of claim 2 , wherein when the additive particles are present and the external stimulus is laser energy, the porous polymer material transforms from the deformed state to the recovered state, wherein in the recovered state the porous polymer material has a reflectance of the laser energy of about 80% or more after exposure to the laser energy.
8. The porous polymer material of claim 1 , wherein the material is capable of being returned to the deformed or recovered state about 10 or more times.
9. The porous polymer material of claim 1 , wherein the distance between 50% or more of the pairs of adjacent voids is substantially the same and each void has a volume that is about the same.
10. The porous polymer material of any of claim 1 , wherein about 10 to 1×10 12 unique pairs of adjacent voids are present is in a 1 cm×1 cm×10 μm sample.
11. The porous polymer material of claim 1 , wherein the diameter of each of the voids is about 100 nm to 1000 nm.
12. The porous polymer material of claim 2 , wherein the additive particles are selected from graphene, graphite, graphene oxide, graphite oxide, carbon black, or combinations thereof.
13. The porous polymer material of claim 12 , wherein the additive particles are graphene particles having a diameter of about 1 nm to 1000 μm.
14. The porous polymer material of claim 2 , wherein the weight percent of the additive particles is about 0.1 wt % to 5 wt % of the porous polymer material.
15. The porous polymer material of claim 1 , wherein a chromogenic sensor is formed from one or more layers of the porous polymer material, and wherein each layer is about 1 μm to 300 μm thick.
16. The porous polymer material of claim 1 , wherein the porous polymer material in the recovered state has a static water contact angle greater than about 150°, and, wherein the porous polymer material in the deformed state has a static water contact angle of about 90° to 150°.
17. The porous polymer material of claim 7 , wherein a chromogenic sensor is formed from one or more layers of the porous polymer material, and wherein each layer is about 1 μm to 300 μm thick;
wherein the additive particles are graphene particles having a diameter of about 1 nm to 1000 nm;
wherein the weight percent of the graphene particles is about 0.1 wt % to 5 wt % of the porous polymer material; and
wherein when the porous polymer composite material is in a deformed state, the chromogenic sensor has the characteristic of appearing black.
18. The porous polymer material of claim 5 , wherein the filler polymer is selected from the group consisting of: polydimethylsiloxane, polybutadiene rubber, styrene butadiene rubber, nitrile rubber, chloroprene, neoprene, polyacrylates, polystyrene, polyurethanes, epoxies, and a combination thereof.
19. A porous polymer material comprising an ordered array of voids, wherein a distance between at least two pairs of adjacent voids is substantially the same, wherein a polymer framework separates the voids;
wherein the porous polymer material has a recovery state, wherein the voids are in an uncollapsed state and the porous polymer material has the characteristic of having an iridescent color;
wherein the porous polymer material has a deformed state, wherein the voids are in a collapsed state and the porous polymer material has the characteristic of being either non- iridescent or substantially transparent;
wherein the deformed state occurs when a solvent is evaporated from the porous polymer material causing the voids to collapse, and wherein when the recovery state occurs when the porous polymer material in the deformed state is exposed to an external stimulus causing the collapsed voids renew their uncollapsed state, wherein the external stimulus is selected from: a target compound or a laser illumination; and
wherein the external stimulus is a target compound; and wherein the target compound is uncured PDMS oligomer.
20. The porous polymer material of claim 1 , wherein the external stimulus is a target compound; and wherein the target compound is a drug.
21. The porous polymer material of claim 1 , wherein the external stimulus is a target compound; and wherein the target compound is Vitamin E.
22. The porous polymer material of claim 1 , wherein the external stimulus is a target compound; and wherein the target compound is lidocaine.
23. The porous polymer material of claim 5 , wherein the filler polymer forms a hidden anti-counterfeiting pattern wherein the hidden anti-counterfeiting pattern is formed by the voids the second region being filled by a filler polymer, wherein the filler polymer causes the voids of the second region to irreversibly remain in an uncollapsed state with the characteristic of having an iridescent color, wherein the hidden anti-counterfeiting pattern is not visible when the first region is in a recovery state since both the first and second regions have the characteristic of having the same iridescent color; and
wherein if exposed to a solvent when the porous polymer material is in a recovery state, the exposing causes the first region of the porous polymer material to return to a deformed state having a transparent appearance, and wherein the hidden anti-counterfeiting pattern has the characteristic of having an iridescent color.
24. The porous polymer material of claim 5 , wherein the external stimulus is a target compound; and
wherein the target compound is selected from the group consisting of: uncured PDMS oligomer, a drug, Vitamin E, and lidocaine.
Assignments (3)
CONFIRMATORY LICENSE
Recorded May 16, 2023
From: UNIVERSITY OF FLORIDA
To: NATIONAL SCIENCE FOUNDATION
Reel/Frame 063652/0622 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Sep 2, 2021
From: JIANG, PENG; LIU, RUOCHEN; FEI, RAO; ZHANG, WEI; LEO, SIN-YEN; LEVERANT, CALEN; JIANG, HELENA; TAYLOR, CURTIS; ZHANG, YIFAN
To: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION , INC
Reel/Frame 057372/0739 →
CONFIRMATORY LICENSE
Recorded Jan 5, 2021
From: UNIVERSITY OF FLORIDA
To: NATIONAL SCIENCE FOUNDATION
Reel/Frame 054899/0298 →
Continuity (3)
Provisional Application
62775493
· Dec 5, 2018
Provisional Application
62629739
· Feb 13, 2018
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