Manufacturing method for increasing thermal and electrical conductivities of polymers
A method of manufacturing to increase the thermal and electrical conductivity of polymers includes layering a filled polymer with an unfilled polymer to produce a multi-layered system of alternating filled and unfilled polymer layers. The filler material comprises thermally and/or electrically conductive material. A preferred polymer is a shape memory polymer. A method of manufacturing magnetic multi-layered polymer systems is described. Articles formed from such multi-layered systems are also disclosed.
1. A method of producing a multi-layered shape memory polymer system, comprising:
layering a first shape memory polymer with a second shape memory polymer in alternating layers, wherein the alternating layers are not corrugated; and
wherein the first shape memory polymer and/or the second shape memory polymer comprises an electrically and/or thermally conductive filler in an amount effective to increase the thermal and/or electrical conductivity of the first and/or second shape memory polymers.
2. The method of claim 1 , wherein the multi-layered system comprises micro-layers.
3. The method of claim 1 , wherein the first shape memory polymer and the second memory polymer comprise the same shape memory polymer.
4. The method of claim 1 , wherein the first and second shape memory polymers have a soft segment transition temperature of about −63° C. to about 120° C.
5. The method of claim 1 , wherein the filler is a metal, metal oxide, metal alloy, carbon, or mixtures comprising at least one of the foregoing fillers.
6. The method of claim 1 , wherein the filler is a powder comprising carbon, iron, iron oxides, iron alloys, aluminum, copper, magnesium, chromium, tin, nickel, silver, titanium, stainless steel, and mixtures comprising at least one of the foregoing fillers.
7. The method of claim 1 , wherein the filler is a fiber fabricated from copper, copper alloys, silver, aluminum, nickel, nickel alloys, carbon, graphite, magnesium, chromium, tin, iron, iron alloys, titanium, and mixtures comprising at least one of the foregoing fillers.
8. The method of claim 1 , wherein the filler is a fiber comprising a metal-coated fiber core material, wherein the core material is glass, silicates of aluminum, silicates of magnesium, silicates of calcium, graphite, carbon fibers, or mica.
9. The method of claim 1 , wherein the first memory polymer comprises two electrically and/or thermally conductive fillers.
10. The method of claim 1 , wherein the multi-layered system has a thermal conductivity of about 1 to 20 W/mK and an electrical conductivity of about 0.01 to 1.0 ohm-cm.