intro to plastic no lp

7/28/2019 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/

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