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Differentiate the following pairs of polymers based on the property mentioned aganist each. (i) Novolac and bakeline (structure). (ii) Buna- S and terylene (intermolecualr forces of attraction). |
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Answer» SOLUTION :(i) Novolac is a linear but bakelite is a cross -linked polymer of phenol and formaldehyde. (ii) Terylene contains ester functional groups which are polar in, therefore , the intermoleuclar forces of attraction involved in terylene are strong dipoe-dipole interactions as shown below:  Buna-S , on the other hand, does not have polar functional groups. It has only non - polar hydrocarbon CHAINS and HENCE has only weak van DER WAALS forces of attraction as shown below : 
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