Why isn't rubber a better thermal insulator than styrofoam?

In summary: In the street vernacular, "elastic" is often used to describe something that bounces back after you stretch it. However, in physics, "elastic" means that the energy in the system is conserved after the collision. This is different from "plastic," which means that the energy in the system is not conserved.In summary, Rubber is an insulator because it does not absorb or reflect energy well.
  • #1
OmegaKV
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I haven't studied materials in depth, but I would assume that something like rubber would make a good insulator because of its bounciness. The molecules of a substance contained in a rubber container would collide with the walls of the container in a very elastic collision, and the kinetic energy of the substance would be conserved.
 
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You might not be comparing materials of similar structure. You said nothing of the structure of the rubber, nor which chemical type of rubber you are comparing. Styrofoam(foamed polystyrene) has a low thermal conductivity because it is a foam. Foamed rubbers can also have low thermal conductivity. Foamed neoprene is used in wetsuits for this reason. Its thermal conductivity is almost as low as foamed polystyrene, but it is much more flexible. Foamed neoprene is also used in those bottle/can koozies which are used to keep cold drinks cold for a bit longer.
 
  • #3
The Bill said:
Styrofoam(foamed polystyrene) has a low thermal conductivity because it is a foam.

because its structure is predominantly air and air is a poor thermal conductor
 
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  • #4
OmegaKV said:
I haven't studied materials in depth, but I would assume that something like rubber would make a good insulator because of its bounciness. The molecules of a substance contained in a rubber container would collide with the walls of the container in a very elastic collision, and the kinetic energy of the substance would be conserved.
Rubber is not a very elastic material, and an impact that briefly stretches it loses energy. A substance that is good for demonstrating low-loss elastic collisions is quartz glass. If you drop a marble onto a slab of rubber, then onto a slab of quartz, the rebound is higher from the quartz because quartz is a very elastic material.

The term "elastic" has a precise meaning in physics. (You can see how it differs from the street vernacular where the word "elastic" just means stretchy.)
 

1. Why is styrofoam a better thermal insulator than rubber?

Styrofoam is a better thermal insulator than rubber because it has a lower thermal conductivity, which means it is better at preventing the transfer of heat. This is due to the structure of styrofoam, which is made up of tiny pockets of air that trap heat and prevent it from passing through. Rubber, on the other hand, is a denser material, with a higher thermal conductivity, allowing heat to pass through more easily.

2. Can rubber be used as a thermal insulator at all?

Yes, rubber can be used as a thermal insulator, but it is not as effective as styrofoam or other materials with lower thermal conductivity. This is because rubber has a higher thermal conductivity, meaning it is not as good at preventing heat transfer.

3. Is the composition of rubber the reason for its lower thermal insulating properties?

Yes, the composition of rubber is one of the main reasons for its lower thermal insulating properties. Rubber is made up of long polymer chains, which are tightly packed together, allowing heat to pass through more easily. This is different from the structure of styrofoam, which is made up of many tiny pockets of air, creating a barrier for heat transfer.

4. Can the thickness of rubber affect its thermal insulating properties?

Yes, the thickness of rubber can affect its thermal insulating properties. Thicker rubber will have a higher thermal conductivity, meaning it is less effective at preventing heat transfer. This is because thicker rubber will have more densely packed polymer chains, allowing heat to pass through more easily.

5. Are there any other factors that contribute to rubber's lower thermal insulating properties?

Yes, apart from its composition and thickness, there are other factors that contribute to rubber's lower thermal insulating properties. These include its density, moisture content, and temperature. A higher density of rubber will result in a higher thermal conductivity, and moisture content can also affect its insulating abilities. Additionally, rubber becomes less effective as a thermal insulator at higher temperatures, as the increased thermal energy causes the polymer chains to vibrate and allow heat to pass through more easily.

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