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How are polymers classified on the basis of mode of polymerisation ? Explain with examples. |
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Answer» Solution :Addition polymers : Are formed by REPEATED addition of a large number of same or different monomers possessing DOUBLE or triple bonds. E.g., Polythene. `underset("Ethene")(nH_2C = CH_2) to underset("Polythene")((-H_2C - CH_2-)_n)` Condensation polymers : Are formed by repeated condensation reaction between TWO bifunctional or trifunctional monomer units usually with the elimination of small molecules like WATER, alcohol, ammonia, etc. E.g., Nylon-6, 6. `nHOOC(CH_2)_4COOH + nH_2N (CH_2)_6NH_2 to (underset("Nylon 6,6")(-overset(O)overset(||)C-(CH_2)_4overset(O)overset(||)C-overset(H)overset(|)N-(CH_2)_6overset(H)overset(|)N-))_n+(2n-1)H_2O` |
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