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Polymers 3.12 - Coggle Diagram
Polymers 3.12
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Kevlar
Uses; Bullet proof vests, Flameproof clothing
Kevlar chains are flat and can pack closely meaning hydrogen bonds between neighbouring chains are stronger than in other polymers
Strongest IMF is hydrogen bonding which forms between - Nitrogen of one amide link and Hydrogen of other amide link
Physical Properties
Condensation polymers are generally stronger and more rigid - Contain polar bonds - Polyesters (dipole-dipole) - Polyamides ( Hydrogen bonds)
Addition - chemically inert (backbone non polar) - carbon skeleton consists of C-C single bonds and cannot be hydrolysed
Disposal of Polymers
Addition Polymers - Chemically inert - bonds between repeat units are strong and non polar - not susceptible to attack by nucleophiles - build up in waste tips
Condensation Polymers - Polyesters and Polyamides can be broken down by hydrolysis - bonds between repeating units are polar so susceptible to attack by nucleophiles (water) - these polymers are biodegradable and will eventually break down
Polyamides can be formed from a single monomer that has an amine and a carboxylic acid functional groups e.g. Nylon 6 is formed from 6-aminohexaoic acid