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Transcript of Polymers
Viscoelasticity is a property that materials that have both elastic and viscous characteristics have.
What is Viscoelastic Behavior?
What are some Viscoelastic substances?
Monomers: Amino Acids
Glucose, Galactose, Fructose
DNA & RNA: Nucleotides
What are Polymers?
A molecule formed by smaller molecules (monomers) that are chiefly similar to one another
Covalent or Ionic bonds that bring monomers together!
"The linking of polymer chains"
General Rule of Thumb for Cross-links
The more cross-links, the stronger the polymer gets (and less flexible it gets) and the more elastic it gets.
Viscoeleastic substances, such as polymers deal with stresses by rearranging their parts
The rearrangement, also deformation is called Creep
Polymers return back to original form by creating a backs stress to counteract the original stress
Silly Putty Demo
Accelerants and catalysts used to speed up chemical reactions.
Cross-links formed by chemical reactions initiated by heat, pressure, change in pH, or radiation
Lego pieces are the monomers
Truck is the polymer substance
Chemical formula: NaC3H3O2
Covalent bonds between carbon atoms are the cross-links between monomers
Also contains ionic bond with Na
Sodium Polyacrylate Demo
Why does it happen?
Elastomers are any rubbery material composed of long polymers that are capable of recovering their original shape after being stretched to great extents—hence the name elastomer, from “elastic polymer.”
Under normal conditions, the long molecules making up an elastomeric material are irregularly coiled. With the application of force, the molecules straighten out in the direction in which they are being pulled.
Upon release, the molecules spontaneously return to their normal compact arrangement.
Latex monomer formula: C5H7Latex monomer formula: C5H7
Carbon Structures or
Diamond- Carbon bonded to four other carbon atoms in a tetrahedral pattern
Fullerenes- Globeshaped, cagelike arrangements of carbon atoms.
Amorphous- Amorphous Carbon have no predictable arrangement.
Why do slime and silly putty behave the
way they do?
Their viscous element resist flow and change, like honey.
Their elastic element allows them to return to their previous state if a stress is applied and then removed.
Gautam, Andrew, Niko, Aditya, Chaitanya
Graphite- Carbon atoms are arranged in
sheets or layers.
Polymers: Disaccharidase, Sucrose, Starch Glycogen