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Intro to Plastic NO LP
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Transcript of Intro to Plastic NO LP
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Its Only Plastic
Introduction to Plastics
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Outline
What is plastic?
Where do they come from? Types of plastic
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What is Plastic?
a group of synthetic or natural organic
materials that may be shaped when soft and
then hardenedused in place of other
materials, as glass, wood, and metalswww.dictionary.com
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What is Plastic?
Plastic is a polymer
PolyGreek for many
MerosGreek for part
Polymer = many parts
Made of monomers
Greek = one part
Linear chain of molecules
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What is Plastic?
Homopolymer
Made up of one type of monomer
(polycarbonate for example)
Copolymer
Made up of more than one type of monomer
(ABS for example)
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Where Does Plastic Come From?
Starting material is reacted to form monomer
Monomer is reacted to form polymer (plastic)
Addition polymerization
The monomer comes from one molecule(polyethylene, polypropylene, polystyrene)
Condensation polymerization
Monomer is made from more than one moleculeand a by-product is given off
(polyester, polycarbonate)
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Making Plastic
Addition Type
Ethylene Polyethylene
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Making Plastic
Condensation Type
Terephthalic Acid Ethylene Glycol PET
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Types of Plastic
Thermoplastics
Material can be softened by heat and then formed
into an article. The material can be repeatedly
softened and formed.
Thermoset plastics
Material is hardened with heat, pressure, or
chemical reaction. The material can not be re-softened.
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Types of Plastic
Advantages
Low Temperature Impact
Chemical Resistant
Disadvantages Stress Cracking
High Mold Shrinkage
Polyethylene
Features
Different densities
Processed different ways
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Types of Plastic
Polypropylene
Features
Easy to process Easy to customize
Advantages
Light Weight
Chemical Resistant
Heat Resistant Disadvantages
Low Temperature Impact
Bonding
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Types of Plastic
Advantages
Rigid
Low Cost
Disadvantages Processing
PVC
Polyvinyl Chloride
Features
Easily modified
Rigid is flame retardant
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Types of Plastic
Advantages
Rigid
Paintable
Disadvantages Weathering
Chemical Resistance
Brittleness (GPPS)
Polystyrene
Features
Can increase impact (HIPS)
Transparent (GPPS)
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Types of Plastic
Styrene Acrylonitrile (SAN)
Features
Improved properties vs. GPPS
Transparent
Advantages
Chemical Resistance Weathering
Disadvantages
Heat Resistance
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Types of Plastic
Acrylonitrile Butadiene Styrene (ABS)
Features
Different gloss levels
Alloys
Advantages
Dimensional Stability
Toughness
Disadvantages
Weathering
Solvent Resistance
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Types of Plastic
Nylon 6
Features
Abrasion resistant
Creep resistant
Advantages
Strength, Stiffness
Chemical resistant
Disadvantages Water absorption
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Types of Plastic
Nylon 66
Features
Abrasion resistant
Versatile
Advantages
Strength, Stiffness
Chemical resistant
Heat resistant
Disadvantages
Water absorption
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Types of Plastic
Polybutylene Terephthalate (PBT)
Features
Dimensional Stability
Processing
Advantages
Water absorption
High Strength
Disadvantages
Boiling Water
Chemical Resistance
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Types of Plastic
Polyethylene Terephthalate (PET)
Features
Can be transparent
Tricky to injection mold
Advantages
Heat Resistance
Close Mold Tolerances
Disadvantages
Warpage
Must be Dried
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Types of Plastic
Advantages
Dimensional stability
Toughness
Disadvantages Chemical resistance
Fatigue resistance
Polycarbonate
Features
Transparent
Creep resistant
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Resources
www.omnexus.com
www.rtpcompany.com
www.pslc.ws/macrog/
http://www.omnexus.com/http://www.rtpcompany.com/http://www.pslc.ws/macrog/http://www.pslc.ws/macrog/http://www.rtpcompany.com/http://www.omnexus.com/