Liquid-free, polymeric reinforcement of nanoscale assemblies
Provided herein is a nanoscale material assembly made up of a plurality of nanoscale structures with a crosslinked polymer thermally deposited on the structures. Also disclosed are methods for preparing the nanoscale material assembly with a deposited crosslinked polymer. Further disclosed are various conditions and materials that when used in the preparation of the nanoscale material assemblies further enhance their mechanical properties. In some embodiments, the nanoscale material assemblies can be either nanoscale yarn assemblies or nanoscale sheet assemblies.
1. A nanoscale material assembly comprising:
at least one nanoscale substrate comprising a plurality of carbon nanotubes having a plurality of inter-nanotube entanglement points, the plurality of carbon nanotubes arranged as yarns or free-standing sheets with at least one crosslinked polymer deposited on the nanoscale substrate, wherein said crosslinked polymer is obtained by crosslinking a thermally self-crosslinkable polymer comprising poly-glycidyl methacrylate (PGMA) after vapor-phase deposition thereof on the nanoscale substrate at a temperature greater than 100 degrees Celsius, the PGMA having an amount equivalent to a thin film of less than 200 nm on a flat substrate and forming at least a threshold amount of mechanical reinforcing of the plurality of inter-nanotube entanglement points such that the at least one nanoscale substrate has a Young's modulus of elasticity of at least 20 GPa.
2. The nanoscale material assembly of claim 1 , wherein the thermally self-crosslinkable polymer is deposited by in situ production thereof on the structures through initiated chemical vapor deposition.
3. The nanoscale material assembly of claim 1 , wherein a thermalizing source for crosslinking the thermally self-crosslinkable polymer is a furnace or ultraviolet light.
4. The nanoscale material assembly of claim 1 , wherein the assembly comprises a metal mesh or another material that can be placed into a reactor and is stable at initiated chemical vapor deposition conditions used to deposit the polymer.
5. The nanoscale material assembly of claim 1 , wherein the thermally self-crosslinkable polymer is poly-glycidyl methacrylate.
6. The nanoscale material assembly of claim 1 , wherein the thermally self-crosslinkable polymer is any one or a combination of acrylates or methacrylate based polymers capable of being coated onto a nanoscale structure via initiated chemical vapor deposition.
7. The nanoscale material assembly of claim 1 , wherein the deposition conditions are between 100° to 350° C. for the filament, 10° and 40° Celsius for the assembly and between 0.001 torr and 100 torr for the reactor.