Which property distinguishes thermoplastics from thermosetting plastics?
They can be remelted and remoulded repeatedly
Thermoplastics consist of long polymer chains held together mainly by weak intermolecular forces, with little or no cross-linking. On heating, these weak forces are overcome, so thermoplastics soften and can be remelted and remoulded repeatedly without changing their chemical structure.
Thermosetting plastics, in contrast, form permanent, rigid cross-links between chains when first moulded and cured, so they cannot be remelted or reshaped once set; heating them further only chars or decomposes them rather than softening them.
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