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Polymerization. What are polymers?. Polymer : very long molecules made by linking together smaller molecules called monomers. Monomer. Polymer. What are polymers?. Polymer : very long molecules made by linking together smaller molecules called monomers

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Presentation Transcript
what are polymers
What are polymers?
  • Polymer: very long molecules made by linking together smaller molecules called monomers

Monomer

Polymer

what are polymers1
What are polymers?
  • Polymer: very long molecules made by linking together smaller molecules called monomers
    • Plastics and nylons are examples of polymers

Monomer

Short segment of polyethylene terephthalate polymer

Polymer

naming polymers
Naming polymers
  • Polymers are named as follows:
    • Write “poly” which means “many”
    • Follow this with the name of the monomer
    • We often use the common name instead of the IUPAC name
    • Example: Consider the monomer 1-chloroethene. The common name for this is “vinyl chloride”. What would the polymer name be?

?

addition polymerization reactions
Addition Polymerization Reactions
  • Synthetic polymers can be formed by Addition Polymerization, or Condensation Polymerization
  • Addition Polymerization
    • Monomers with double bonds join together through multiple addition reactions
    • Look for: alkenes in the monomer, single bonds in polymer

+

Ethene

Ethene

etc.

Polyethene

addition polymerization reactions1
Addition Polymerization Reactions

+

ethenylbenzene

(styrene)

Polystyrene “Styrofoam”

condensation polymerization reactions
Condensation Polymerization Reactions
  • Condensation reactions
    • Monomers are joined together by the formation of ester or amide bonds
    • Look for: reactions between a carboxylic acid and an alcohol (ester bonds), or reactions between a carboxylic acid and an amine (amide bond)
    • Look for: the release of water molecules during the reaction

1,6-diaminohexane

Adipic acid

1,6-diaminohexane

n

Amide bond

Amide bond

Nylon 66

practice recognizing polymerization reactions
Practice recognizing polymerization reactions
  • Homework
  • Pg 107 q 4-5
  • Pg 111 q 1-3
photodegradable plastics
Photodegradable Plastics

“Regular” plastic

Photodegradable plastic

Can degrade in a few years to a few months

Degrades if at surface of landfill

Still harmful to land and marine wildlife, but degrades sooner

  • All plastics are eventually degraded by sunlight, this can take 100s to 1000s of years
  • Dr. James Guillet, a Canadian scientist invented a group of plastics that adsorb light easily, which degrades them much faster
  • Some can take 1000 years to break down naturally
  • Barely degrades at all in landfills
  • Harmful to land and marine wildlife
biopolymers
Biopolymers

Cellulose

DNA

biopolymers1
Biopolymers

Proteins

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