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1. |
b) Distinguish between thermoplastic and thermosetting resins. |
Answer» <p>Thermo plastics</p><p>It can be melted and recycled.2 Dimensional with no crosslinks.Prepared mostly by additional polymerisation.Mostly processed by conventional methods such as injection molding, extrusion and blow molding.Examples include polyethylene (PE), polyethylene terphthalate (PET).Thermosetting plastics</p><p>It cannot be melted and recycled.3 Dimensional with multiple crosslinks.Prepared mostly by condensation polymerisation.Mostly processed by special methods such as compression, transfer and casting.Examples include Phenol formaldehyde, melamine formaldehyde.</p> | |