Distinguish between thermoplastic and thermosetting resins. ?
Distinguish between Thermoplastic and Thermosetting plastic.
|1.Formed by addition polymerization.||1. Formed by condensation polymerization.|
|2. Can be moulded and remoulded.||2.Remoulding is not possible.|
3. They softens on heating because the linear chains can slip over each other very easily.
|3. They do not become soft on heating,because cross links retain the strength on heating. But
prolonged heating causes charring.
|4. Soft, weak and less brittle.||4. Hard, strong and brittle.|
|5. Soluble in some organic solvents.||5.lnsoluble in almost all organic solvents.|
|6. Relatively low molecular weight.||6.Relatively high molecular weight.|
|7 Example: PVC, PE, Teflon.||7.Example: UF, PF, Nylon 6-6, etc.|
Concept: Thermoplastic Plastic
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