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Subject - Macromolecular Chemistry
Thermoplastics are solid substances that possess significant elasticity at room temperature but turn into a flowable state on heating. They consist of linear or branched polymers that in principle become flowable above glass transition temperature in the case of amorphous thermoplastics and in the case of partly or fully crystalline thermoplastics above the melting temperature. In the softened state, they can be worked into molds by pressing, extrusion, injection molding or other molding processes.
See also: elastomer