Conductive polymer foams, method of manufacture, and articles thereof
A polymer and foam technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve problems such as difficulty in obtaining conductive foams
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Embodiment 1-3
[0127] In embodiment 1-3, use the following test to determine conductivity, wherein the volume resistivity is greater than 10 3 Ohm-cm foams are used for comparison. As is known, specific values for volume resistivity and electrostatic shielding will depend on specific test methods and conditions. For example, volume resistivity and shielding efficiency are known to vary with the pressure placed on the sample during testing. Electrical equipment and test fixtures that can be used to measure volume resistivity in the following samples are as follows. Fixtures were conventionally fabricated 2.5 cm x 2.5 cm (1 inch x 1 inch) square gold plated presses with electrical contacts. The fixture is equipped with a digital force gauge that allows the operator to control and adjust the force applied to the sample surface. The power supply is capable of delivering 0 to 2 amps to the sample surface. The voltage drop and resistance across the samples were measured with a HP 34420A Nano...
Embodiment 1
[0131]Nickel microspheres and nickel-coated ceramic microspheres were evaluated as conductive fillers in polysiloxane foams. Polysiloxane (Dow Corning Silicone 8137), filler microspheres, and polysiloxane cure inhibitor (1-octyn-3-ol from Aldrich Chemical Co.) were mixed in a Flaktek rapid mixer with controlled Thickness of 1000 Å was cast on PET film and placed in an oven exposed to an adjustable magnetic field. Typically, the chemically foamed and cured foam has a thickness of 70 to 80 mils (1778 to 2032 microns).
[0132] The results in Table 1 show that no electrical conductivity was observed in thick cured foam layers even under strong magnetic fields up to 1200 Gauss.
[0133] Table 1
[0134] Test serial number
1
2
3
4
5
6
7
magnetic field, gauss
250
250
1000
1000
1200
1200
1200
Cast Thickness, Mils
10
20
20
20
20
20
20
Oven temperatur...
Embodiment 2
[0139] Table 2 shows the results of additional tests performed with 100% nickel microspheres. Formulations were cast to a thickness of 18 to 40 mils (457 to 1016 microns) to prepare foam samples.
[0140] Table 2
[0141] Test serial number
1
2
3
4
5
6
7
8
9
10
11
12
13
magnetic field, gauss
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
1000
Cast Thickness, Mils
20
20
40
40
40
27
18
18
18
18
18
18
27
Oven temperature, ℃
60
60
60
60
60
60
60
60
60
60
60
60
60
Oven residence time, minutes
10
10
5
5
5
5
5
5
5
5
5
5
5
top carrier
none
none
none
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Abstract
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