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Comparison of Plastics: Thermoplastics vs Thermosettings
- Formed by Polymerisation: Addition/Condensation
-Linear w/ No Cross Links/ 3D w/Number of Cross Links
-Monomers: bifunctional/poly functional
-Molecular Weight: Low/High
-Soft, Weak, Less Brittle/Hard, Strong, More Brittle
-Solubility in Organic Solvents: Yes/No
-Examples: PVC, PVA/Phenolformaldehyde, Nylon 6:6
On the basis of Polymerisation, Cross Links, Monomers, Molecular Weight, Physical Properties, Solubility, Examples.
Compounding of Plastics:
Binders (Resins) - Hold Constituents together
Fillers/Extenders - impart better tensile strength, hardness, finish, workability, opacity etc.
Pigments/Dyes
Catalysts/Accelerators
Plasticizers - increase the plasticity
Lubricants - Impart flawless ness, glossy finish
Stabilizers - improve thermal stability
Fabrication/Moulding of Plastics
Compression, Transfer - Thermosets
Injection, Extrusion - Thermoplasts
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