LASER-INDUCED GRAPHENE FORMATION IN POLYMER COMPOSITIONS
A method for forming a polymer/graphene nanocomposite includes providing a polymer matrix comprising a clear polymer and an additive effective to induce graphitization of the polymer at a wavelength in a range of 8.3 to 11 μm, and irradiating the polymer matrix with radiation comprising a wavelength in a range of 8.3 to 11 μm to provide the polymer/graphene nanocomposite.
1 . A method for forming a polymer/graphene nanocomposite, the method comprising:
providing a polymer matrix comprising a clear polymer and an additive effective to induce graphitization of the polymer at a wavelength in a range of 8.3 to 11 μm; and
irradiating the polymer matrix with radiation comprising a wavelength in a range of 8.3 to 11 μm to provide the polymer/graphene nanocomposite.
2 . The method according to claim 1 , wherein the clear polymer comprises a cyclic olefin polymer, fluoropolymer, polyacetal, poly(C1-6 alkyl)acrylate, polyacrylamide, polyacrylonitrile, polyamide, polyamideimide, polyanhydride, polyarylene ether, polyarylene ether ketone, polyarylene ketone, polyarylene sulfide, polyarylene sulfone, polybenzothiazole, polybenzoxazole, polybenzimidazole, polycarbonate, polyester, polyetherimide, polyimide, poly(C1-6 alkyl)methacrylate, polymethacrylamide, polyolefin, polyoxadiazole, polyoxymethylene, polyphthalide, polysilazane, polysiloxane, polystyrene, polysulfide, polysulfonamide, polysulfonate, polythioester, polytriazine, polyurea, polyurethane, vinyl polymer, a thermosetting alkyd, bismaleimide polymer, bismaleimide triazine polymer, cyanate ester polymer, benzocyclobutene polymer, diallyl phthalate polymer, epoxy, hydroxymethylfuran polymer, melamine-formaldehyde polymer, phenolic polymer, benzoxazine, polydiene, polyisocyanate, polyurea, polyurethane, silicone, triallyl cyanurate polymer, triallyl isocyanurate polymer, or a combination thereof.
3 . The method according to claim 1 , wherein the clear polymer comprises a polyamide, polycarbonate, polyester, polyetherimide, poly(C1-6 alkyl)(meth)acrylate, poly(methyl adamantine methacrylate), polypropylene, poly(methyl methacrylate), polystyrene, melamine-formaldehyde polymer, poly(arylene ether), poly(p-phenylene oxide), polyurethane, or a combination thereof.
4 . The method according to claim 1 , wherein the clear polymer comprises a polycarbonate, polyetherimide, or a combination thereof.
5 . The method according to claim 1 , wherein the clear polymer comprises at least one polycarbonate, wherein the polycarbonate is a polycarbonate homopolymer, copolycarbonate, poly(carbonate-ester), poly(carbonate-siloxane), poly(carbonate-ester-siloxane), or a combination thereof.
6 . The method according to claim 1 , wherein the clear polymer comprises a poly(carbonate-ester).
7 . The method according to claim 5 , wherein the clear polymer further comprises a polyetherimide.
8 . The method according to claim 5 , wherein the clear polymer comprises the polycarbonate in an amount of 10 to 90 volume percent and the polyetherimide in an amount of 90 to 10 volume percent, each based on a total volume of the clear polymer.
9 . The method according to claim 6 , wherein the clear polymer comprises the poly(carbonate-ester) in an amount of 10 to 90 volume percent and the polyetherimide in an amount of 90 to 10 volume percent, each based on a total volume of the clear polymer.
10 . The method according to claim 1 , wherein the additive has an absorbance of greater than 2 in a range of 9 to 11 μm.
11 . The method according to claim 1 , wherein the additive comprises mica, a phenol resin, a pigment, a dye, a biopolymer, a cellulose, a lignin, or a combination thereof.
12 . The method according to claim 1 , wherein the additive is present in an amount of 0.05 to 15 volume percent, based on a total volume of the polymer matrix.
13 . The method according to claim 1 , wherein the unfilled polymer matrix has an absorbance of less than 1 in a range of 9 to 11 μm.
14 . The method according to claim 1 , comprising irradiating the polymer matrix using a laser, wherein the operating conditions of the laser comprise:
a power in a range of 0.1 to 0.6 W,
a laser speed in a range of 1.7 to 2.5 cm s −1 ,
a pulse duration in a range of 10 to 30 μs, and
a resolution in a range of 500 to 1,000 ppi.
15 . The method according to claim 14 , further comprising adjusting one or more of the operating conditions of the laser to adjust a property of the polymer/graphene nanocomposite.
16 . The method according to claim 1 , wherein the polymer/graphene nanocomposite has at least one of:
an electrical conductivity of 1 to 2,000 S/m, measured according to ASTM 257-75, or
a degree of graphitization of 0.5 to 2.0, measured according to ISO TC 201 (Surface Chemical Analysis) and further according to the Versailles Project on Advanced Materials and Standards by VAMAS TWA41—Graphene and VAMAS TWA42—Raman.
17 . The method according to claim 1 , wherein the polymer/graphene nanocomposite has a greater degree of adhesion compared to a second polymer matrix comprising the same clear polymer without the additive, the second polymer matrix having been irradiated with radiation comprising a wavelength in a range of 8.3 to 11 μm.
18 . A polymer/graphene nanocomposite formed by the method of claim 1 .
19 . A graphitized polymer composition comprising:
a clear polymer;
an additive effective to induce graphitization of the polymer at a wavelength in a range of 8.3 to 11 μm; and
polymer-derived graphene.
20 . An article comprising the polymer/graphene nanocomposite of claim 19 .