Distinguish between thermoplastic and thermosetting polymer.
|1. These are formed by addition polymerisation .||These are formed by condensation polymerisation .|
|2. They have low molecular weight .||They have high molecular weight.|
|3.They are usually soft ,weak and less brittle .||hey are usually hard ,strong and more brittle|
|4. They are long chain linear polymer with negligible cross links||They have three-dimensional network structure with number of crosslinks .|
|5. They are usually soluble in some organic solvents .||Due to strong bonds and crosslinks ,they are insoluble in almost all organic solvents .|
|6. They get softened on reheating readily because secondary forces between the individual chain can break easily by heat or pressure .||They donot soften on reheating because the crosslinks and bonds retain their strength on heating .|
|7.Example : Polyethylene ,Polystyrene ,PVC ,PVA .||Example : Phenolformaldehyde,ureaformaldehyde , Nylon 6,6 .|
Concept: Thermosetting plastic
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