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- author "me"
- fileName "Material Science"
- tags "Final, exam, study, guide, south, mcwright"
- description "Key topics and vocabualry words to study for the Material Science Final Exam"
- List the 7 different types of polymer processes:
- Film Blowing
- Injection Molding
- Compression Molding
- Transfer Molding
- Blow Molding
A continous process best suited for pairs of constant cross section like pipes, rods, plastic bags and films
This process is an extension of film extrusion
This process continously extrudes vertically a ring of semi-molten polymer in an upward direction
- A common process for forming plastics
- Rapid processing
- Little waste
- Easy automation
One of the 1st methods used to form plastics
A modified form of compression molding, used primarily to produce thermosetting plastics
Molds are expensive
A rapid but inexpensive process
What is the most commonly used polymer process?
Recycling Code 1
PET/PETE - Polyethylene Terephthalate
Recycling Code 2
HDPE - High Density Polyethylene
- Laundry degergent containers
Recyling Code 3
PVC - Poly(vinyl) Chloride
- Shower curtains
Recycling Code 4
LDPE - Low Density Polythylene
- Grocery bagsm
- Wrapping films
Recycling Code 7
PC - Polycarbonate
- Comapct disks
Can be seen through and light can pass through it
Light can pass through it, but can not be seen through
Light cannot pass through and is not see through
Why are composites used?
"The whole is greater than the sum of parts"
They are lighter, stiffer, stronger and more heat tolerant than individual materials
Examples of composites:
- Starched shirts
- Tennis shoes
Fibers added to a material to increase strength
Can be continous or discontionous
They run the entire length of the compsite; often used because they are easier to allign
List Types of Forces/Stresses:
- Compression(pushing together/squeezing)
- Shear(opposite forces not lined up)
Dont run the entire length of the composite
List 3 Identification Tests to Identify Polymer Resin:
- Heat Test
- Water Test
- Copper Wire Test
- Oil Test
What year was the recycle codes created?
Polymers are usually made of...
What type of simple organic compounds come from natural gas, oil and coat?
Composed exclusively of atoms of carbon and hydrogen
What are two major groups of polymers? Give an example of each.
Natural Polymers-Natural Rubber
Characteristics of Polymers:
- Low Density
- Good corrosion resistance
- Low coefficient of friction
- Good mouldaiblity
- Poor temperture resistance
- Can be produced transparent or in different colors
3 Anyalytical Identification Tests:
- Mass spectrometry analysis
- Chemical testing
The act or process of forming polymers
To treat rubber with sulfur and heat, thereby enhancing strength, greater elasticity and durability
Made of long chain polymers that cross link with each other after they've been heated
Relating to a compund that softens when initially heated, but hardens permanently once cooled.
Of or relating to a compund that can be repeatedly made soft and hard through heating and cooling
Relating to chemical compunds containing carbon, especially hydrocarbons
Produced artificially, especially in a laboratory or other man made enviornment
Any of numerous organi compounds that contain only carbon and hydrogen
A substance that initiates a chemical reaction
Any of carious chemical compounds made of smaller, identical molecules(monomers) linked together
Any material that is able to resume its original shape when a deforming force is removed
Made up of disparte or seperate parts or elements
The science and technology of deivces and materials constructed on extremely small scales(as small as individual atoms or molecules)
The resisitance of a subtance to flow
Force causing a deformation or distortion
Change caused by stress
Having a tendency to break when subject to high stress
The quality or condition of being hard
The ability to return to original shape or foorm after being subject to strain
Retains new shape after being deformed by stress
Ability to absorb energy
Resistance to distortion by stress or force
The mass of a substance per unit volume, varies with chane in temperture of a substance
Polymers formed by many monomers bonding together without loss of any atom or molecule
A process by which 2 molecules join together, resulting with the loss of a small molecule(usally water)
Material Safety Data Sheet(MSDS)
A form with data regarding the properties of a particular substance. Includes instructions for safety and potential hazards
Contains only single bonds betwenn carbon atoms
Contain at least 1 double bond
Contain at least 1 triple bond
Name the protein extraced from milk to make glue:
Atoms or molecules are only arranged in a regular or repetitive pattern or lattice
Atoms or molecules are in a random order
What are three ways to classify polymers?
Thermosets, Thermoplastics and Elastomers
What types of materials are bicycles made out of today?
Steel/Titanium, Aluminum and Carbon Fiber