Solventless methods of coating a carbon nanotube network and carbon nanotube networks coated with a polymer
First Claim
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1. A method of making a layered carbon nanotube (CNT) composite, comprising:
- providing a CNT layer that is disposed on a substrate, andapplying a solventless polymer precursor directly onto the CNT layer to form a coating over the CNT layer having a thickness of at least 0.250 μ
m;
wherein the solventless polymer precursor consists essentially of polyols and isocyanates and comprising a step of curing to form a polyurethane polymer;
and wherein the step of applying results in a CNT layer that comprises 50 mass % or less of the polymer in the CNT layer;
wherein the underlying CNT layer has a sheet resistance of 120 Ω
/square or less.
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Abstract
A method of coating a carbon nanotube material with a solventless coating composition is described. The resulting coating has been shown to preserve the conductivity of the conductive layer and protect the conductive layer from the effects of subsequent coating compositions. Examples are shown in which the coating formulation comprises a polyol and an isocyanate. A layer material comprising a polyurethane coating on a carbon nanotube network layer is also described.
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Citations
19 Claims
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1. A method of making a layered carbon nanotube (CNT) composite, comprising:
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providing a CNT layer that is disposed on a substrate, and applying a solventless polymer precursor directly onto the CNT layer to form a coating over the CNT layer having a thickness of at least 0.250 μ
m;wherein the solventless polymer precursor consists essentially of polyols and isocyanates and comprising a step of curing to form a polyurethane polymer; and wherein the step of applying results in a CNT layer that comprises 50 mass % or less of the polymer in the CNT layer; wherein the underlying CNT layer has a sheet resistance of 120 Ω
/square or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of making a layered carbon nanotube (CNT) composite:
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providing a CNT layer having a thickness of at least 0.250 μ
m that is disposed on a substrate; andapplying a solventless polymer precursor directly onto the CNT layer to form a coating over the CNT layer having a thickness of at least 0.250 μ
m;wherein the step of applying results in a CNT layer that comprises 50 mass % or less of a coating polymer in the CNT layer after the CNT layer has been coated; and wherein the underlying CNT layer has a sheet resistance of 120 Ω
/square or less. - View Dependent Claims (17, 18)
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19. A method of making a layered carbon nanotube (CNT) composite, comprising:
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providing a CNT layer that is disposed on a substrate, and applying a solventless polymer precursor directly onto the CNT layer to form a coating over the CNT layer having a thickness of at least 0.250 μ
m;wherein the solventless polymer precursor consists essentially of polyols and isocyanates and comprising a step of curing to form a polyurethane polymer; wherein the polyols comprise a polyester polyol and the isocyanates comprise hexamethylene diisocyanate; wherein the step of applying results in a CNT layer that comprises 50 mass % or less of the polymer within the CNT layer; and wherein the underlying CNT layer has a sheet resistance of 120 Ω
/square or less.
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Specification