Write any two differences between addition and condensation polymerization.
Answer
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Hint: Polymerization is a procedure of reacting monomer atoms together in a chemical reaction to frame polymer chains or three-dimensional networks. For example - polyethylene, nylon, PVC.
Complete step-by-step answer:
Note: The possibility to make a mistake is that in addition polymers hetero-chain polymers are formed but in this homo-chain polymers are formed not hetero-chain polymers.
Complete step-by-step answer:
| ADDITION POLYMERIZATION | CONDENSATION POLYMERIZATION |
| 1) Addition polymerization is the procedure of repeated addition of monomers, having double or triple bonds to frame polymers. For example, polythene is formed by the addition polymerization of ethene.${{nCH_2=CH_2}\longrightarrow {-(CH_2-CH_2)}_n-}$ | 1) Condensation polymerization is the procedure of the formation of polymers by repeated condensation reactions between two distinctive bi-functional or tri-functional monomers. A small molecule such as hydrochloric acid or water is eliminated in each condensation reaction. For example, By condensation polymerization of hexamethylenediamine and adipic acid, ${ nylon 6,6 }$ will be formed. |
| 2) It involves mostly one monomer unit. | 2) It involves more than one monomer. |
| 3) Monomers are unsaturated. | 3) Monomers have two or more functional groups. |
| 4) They are chain-growth polymers. | 4) They are generally step-growth polymers. |
| 5) Loss of small molecules like ${ H }_{ 2 }{ O, NH }_{ 3 }$ and NaCl does not take place. | 5) Loss of small molecules ${ H }_{ 2 }{ O, NH }_{ 3 }$ and NaCl will take place. |
| 6) The molecular weight of the resulting polymer is an integral multiple of the monomer’s molecular weight. | 6) The molecular weight of the resulting polymer is an integral multiple of the monomer’s molecular weight. |
Note: The possibility to make a mistake is that in addition polymers hetero-chain polymers are formed but in this homo-chain polymers are formed not hetero-chain polymers.
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