Munguia

Question 1

Definition - Polymer

Answer 1

A chemical substance consisting of large molecules made from many smaller and simpler molecules

Question 2

Definition - Thermoplastic (semi-crystalline)

Answer 2

A polymer with a mixture of both crystalline and amorphous structures

Question 3

Definition - Thermoplastic - amorphous

Answer 3

A polymer with no crystalline structures

Question 4

Definition - Thermoset

Answer 4

A polymer that irreversibly becomes rigid when heated (crystalline)

Question 5

Properties - Thermoplastic (semi-crystalline) MP

Answer 5

Do not soften as temperature rises, have defined and narrow melting point

Question 6

Properties - Thermoplastics (amorphous) MP

Answer 6

Gradually deform as the temperature rises, no set melting point

Question 7

Definition - Elastomer (Thermoplastic)

Answer 7

A natural or synthetic material which is capable of recovering their original shape after being deformed to great extents.

Question 8

Definition - Elastomer (Thermoset)

Answer 8

Rubber materials (natural or synthetic) polymer macromolecules, can be polymerised.

Question 9

Name 3 semi-crystalline Thermoplastics

Answer 9

HDPE
PE
PEEK
PEK
PET
POM
PP

Question 10

Name 3 amorphous Thermoplastics

Answer 10

ABS
COP
PC
PS
SAN
PCL

Question 11

Name 3 Thermosets (plastics)

Answer 11

Polyester
Polyurethane 
PF
Melamine
Epoxy

Question 12

Name 3 Elastomers

Answer 12

Thermoplastic -
TPU
TPS
TPO

Thermoset - 
BR
Neoprene
Styrene
Nitrile rubber

Question 13

Name a difference between SC and A Thermoplastics

Answer 13

Semi- crystalline:

• Remain solid until a given quantity of heat is absorbed, then change into low viscosity liquid
• excellent chemical resistance
• Highly ordered Molecular structure

Amorphous:

• Don’t have a sharp melt point, softens gradually as temp rises
• change in viscosity when heated
• Randomly ordered Molecular structure

Question 14

ABS - Properties and uses

Answer 14

High impact strength
Good toughness
Scratch resistant
Lightweight 
Durable
Food grade

Pipes
PC monitor cases
Keyboard keys
Power tool housing
Refrigerator linings
Food processors
Toys

Question 15

Nylon - Properties and uses

Answer 15

Hard
Tough
Resistant to wear
Low coefficient of friction

Bearings
Gears
Clothing

Question 16

PMMA(acrylic) - Properties and uses

Answer 16

Food safe
Tough
Hard
Durable
Easily machined

Light units
Lenses for car lights
Tupperwares

Question 17

PP - Properties and uses

Answer 17

Lightweight
Food grade
Good impact resistance
Good chemical resistance

Kitchen products 
Medical equipment
String and rope
Bottles
Jars 
Pallets
Food packaging

Question 18

SLS process

Answer 18

Selective Laser Sintering - 
Laser fuses polymer powder
Low cost per part
High productivity
No support structures
Excellent mechanical properties

Best for:
Functional prototyping
End use production

Question 19

SLA process

Answer 19

Stereolithography
Laser cures photopolymer resin
Highly versatile material selection
Highest resolution and accuracy, fine details

Best for:
Functional prototyping
Patterns
Molds
Tooling

Question 20

FDM modelling

Answer 20

Melts and extrudes Thermoplastic filament
Lowest price of entry and materials
Lowest resolution and accuracy

Best for:
Basic proof of concept models
Simple prototyping