Which has the least adsorption coefficient among sponge and thermocole?
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Yes. Thermocool helps with both sound as well as heat. There are however more efficient sound protecting materials to prevent sound entering or leaving a room. 5cm thick Thermocool/polystyrene has a “Sound Absorption Coefficient” of about 0.3 (depending on thickness and how it is mounted). Polyurethane foam is probably better as that can get close to 1.0 - which is why it is what is usually used in recording studios - normally formed into an egg container/waffle form to help break up sound waves.
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Polystyrene is a synthetic aromatic hydrocarbon polymer made from the monomer known as styrene. Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and rather brittle. It is an inexpensive resin per unit weight.
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