3.12 - Polymers Flashcards
____ Polymers are generally Stronger & More Rigid than ____ Polymers?
Condensation
Addition
Advantages of Burying Polymers?
Cheap & Easy
When forming Polyamides, the OH group is ____ from the COOH group
Removed
Addition Polymers are ____ (non-polar) because ____ ?
Chemically Inert
Carbon Skeleton consists of C-C single bonds
Uses of Kevlar?
Bulletproof Vests, Fire Retardant Clothing,
Crash Helmets, Tennis Rackets
Disadvantages of Combusting Chlorinated Polymers?
Acidic HCl Gas
Why are Addition Polymers Non-Biodegradable?
Chemically Inert (Non-Polar) Not Susceptible to attack by Nucleophiles
Strongest IMF present in Kevlar is ____ which forms between ____ ?
Hydrogen Bonding
Lone Pair on N of one Amide Link & a H of another
Catalysts: Hydrolysis of Polyamides
Aqueous Strong Acid (HCl)
or
Aqueous Strong Base (NaOH)
When forming Polyamides, a H atom is ____ from the ____ of the amine
Removed
NH₂
Three Reasons Kevlar is Strong due to its Structure
|> Chains are Planar - can pack closely together
|> IMFs between neighbouring chains are stronger than in other polymers
|> Strongest IMF is hydrogen bonding between Lone pair on N of amide link & a H on another
Define: Hydrolysis
Breaking of a Bond using Water
Advantages of Combusting Polyalkenes?
Produces Heat Energy
Kevlar chains are ____, they can pack ____ ?
Planar
Close together
Advantages of Recycling Polyesters?
|> Saves on Expensive Crude Oil
|> Saves Energy from Refining Crude Oil
|> Reduces waste going to Landfill
|> Produces less CO₂ than Combustion
In Polyesters, what is the largest IMF present?
Permanent Dipole-Dipole
When forming Polyesters, OH groups are ____ from COOH group
Removed
What are Polyamide Monomers held together by?
Amide Links
Why is a catalyst added to the Hydrolysis of Polyesters/Polyamides?
Reaction is v. Slow
Why are Condensation Polymers generally Stronger than Addition Polymers?
Condensation Polymers contain Polar bonds