Learning Goals: Explain the difference between an addition reaction and a condensation polymerization reaction Draw polymer structural diagram, given.

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Learning Goals: Explain the difference between an addition reaction and a condensation polymerization reaction Draw polymer structural diagram, given the.

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Learning Goals: Explain the difference between an addition reaction and a condensation polymerization reaction Draw polymer structural diagram, given the monomer. Draw monomer structure(s), given the polymer. Propose a personal course of action to reduce the use of compounds that are harmful to human health and the environment.

Polymers Poly-mer= “Many parts” Large molecules that are made by linking together smaller molecules “monomers Properties of polymer resemble properties of monomers Natural Polymers: carbohydrates (sugars), proteins (amino acids), DNA (genetic material) Synthetic Polymers: Plastics are considered polymers Strength, flexibility, transparency, stability Cellulose and starch are polymers of glucose

Polymerization: Addition Polymers result from the addition of small subunits “monomers” with double bonds Polymers are generally unreactive (why?)= good containers Plastics are flexible and can be molded by heat (disrupts IMF) What is the effect of adding electronegative groups to monomers? (Polyethene vs. PVC ) Flexible because long chain monomers held together by intermolecular forces- big molecules have greater dispersion forces What is the effect of adding EN groups (F)= Teflon= tetrafluoroethene cf=cf, stronger forces, less likely to react branched polymers (ex. LDPE- brances due to addition of butadiene) prevent molecules from packing as tightly together as unbranched HDPE.

Interactions between Polymers London-Dispersion Dipole-Dipole H-Bonding 3. Crosslinking: Strong covalent bonds between adjacent polymer chains Stronger plastics= Dienes or Trienes

Polymerization: Condensation Polymers Very strong fibers…why? Ex. Kevlar is used in aircrafts, firefighters, bullet proof vests AND is stronger than steel Condensation Polymer: a polymer formed by the release of H2O Polyesters Polyamides

HW: Read p. 78 Identify 10 substances that are made of polymers. What is the major source of most plastics? Why is this problematic? How is the stability of plastics helpful to society? harmful to the environment? What actions can be taken on a personal level to reduce your use of plastic? Name 5 natural polymers. Name 5 synthetic polymers.

HW: p. 87 #1-3 p. 93 #1,2 p. 98 #1 p. 99 #3-6

Fun with Polymers Dissect a Diaper Oobleck Slime