TENSILE STRENGTH TEST

1
TENSILE STRENGTH TEST
2

• Polymers are expected to perform in a variety of
  applications. Fabricators of polymer products
  must know what to expect from the plastics they
  put into their products. A number of physical and
  chemical tests can provide needed information
  about how polymers might behave in use. Tensile
  strength measurements yield information about a
  plastics resistance to elongation or breaking
  when a pulling force is applied

3
(No Transcript)
4
Procedure

• Cut standard size strips from different types of
  plastics to be used by the test machine.
• Size of the machine is not critical as long as it
  is the same
• Fasten the sample and crank until it snaps. Note
  the force needed to snap
• Repeat with other samples to see which has the
  highest tensile strength

5
THE SAMPLE
6
POLYMERS RELATED TO POLYETHYLENE(PROPERTIES AND
USES)
Name Polymer Properties and uses Polyethylene
Unreactive, flexible, impermeable to water
vapor. Packing film, toys, containers,
housewares Polyisobutylene Elastomer, Inner
tubes, truck and bicycle tires Polyacrylonit
rile Carpets and knitwear (Orlon)
Polyvinyl Adhesives, paint, (Acetate)
Chewing gum, safety glass
7
Name Polymer Properties and
uses Polypropylene Lowest density of any
plastic. Indoor/outdoor carpeting,
pipes, bottles Poly Self-extinguishing to
fire. (vinyl chloride) Pipe,
siding, floor tile, imitation leather,
garden hoses Polytetrafluoro- Very
unreactive, nonstick ethylene (teflon) liners
to pots, heart valves, fabrics Polystyrene
Housings for large household appliances,
clear cups, food containers
8
Name Polymer Properties and
usesPoly(methyl- Substitute for
methacrylate glass,paint,fiber optics,
(Lucite, Plexiglas) paint, contact lens
9
Perform Activity.
10
Discussion
The final test of a polymer is how well the
product survives under actual use. Many tests are
designed and applied by manufactures to predict
this behavior. A common test is for tensile
strength. Tensile strength is a measure of a
polymers resistance to being pulled apart.
Different tensile strengths can be build into a
polymer by varying its molecular architecture.
For example, cross linking the polymers
molecules can greatly improve its tensile
strength.