POLYMERS.

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Presentation transcript:

POLYMERS

What is a polymer? (monomers) A polymer is a large molecule (a macromolecule) made up of many smaller repeating units. (monomers)

Polymer The word “poly” comes from the Greek word “many” and “mer” means “parts”. All polymers are made of small repeating molecules called monomers. What do you think “mono” means? mer? one part

Example: monomer + monomer + monomer + monomer + monomer + monomer = polymer Joining monomers to form polymers is done through a chemical reaction known as dehydration synthesis. To make In reality, the number of monomer units in a polymer commonly ranges from 1,000 to 10,000 or more.

Reversed Example: polymer = monomer + monomer + monomer + monomer + monomer + monomer Breaking down polymers into their individual monomers is done through a chemical reaction known as hydrolysis. To break down

Polymer Arrangements: Linear Polymers Branched Polymers Cross-linked Polymers

Examples of Polymers: Natural Polymers – nucleic acids, proteins, carbohydrates, lipids Manufactured Polymers - plastics, nylon, rubber, styrofoam, erasers Some examples of things that are not polymers are metal, water, glass.

Natural Polymers Monomer (repeating units) Nucleic Acid (DNA/RNA) nucleotide Proteins amino acid Carbohydrate (Polysaccharides) monosaccharide Lipid glycerol & fatty acids

Manufactured Polymers Examples Linear (sturdy & rigid) Teflon, soft-drink bottles, milk containers, garden hoses Branched (flexible) Plastic food wrap, sandwich bags, ketchup squeeze bottles Cross-linked (more cross-links=more rigid) Bottle caps, car tires, bowling balls,

Lets Sum It Up! Large molecules made up of many smaller molecules. What are polymers? Polymers are made from __________. How are polymers formed? Through a process called __________ _______. How are polymers broken apart? Through a process called _________. monomers dehydration synthesis hydrolysis

Separate the molecule to show two identical monomers.

Circle the repeating units of this polymer.

Newspaper Activity: Take a piece of newspaper and try tearing it. Rotate the piece of paper 90 degrees and tear it the other way. Did you notice a difference between the tears? Why?????

Lets Sum It Up! How are polymers formed? Through a process called __________ _______. How are polymers broken apart? Through a process called _________. dehydration synthesis hydrolysis