Thermoplastic Materials Engineering Plastics Notes | EduRev

: Thermoplastic Materials Engineering Plastics Notes | EduRev

 Page 1


Thermoplastic Materials 
Engineering Plastics 
MFG 355 
Page 2


Thermoplastic Materials 
Engineering Plastics 
MFG 355 
Engineering Thermoplastics 
• Replace metallic parts 
– Strength and stiffness 
– Retention of properties over range of temperatures 
– Toughness to withstand incidental damage 
– Dimensional stability 
• Low creep 
• Low CTE 
– Withstand environmental factors (UV, O
2
, chemicals) 
– Shaped easily 
Page 3


Thermoplastic Materials 
Engineering Plastics 
MFG 355 
Engineering Thermoplastics 
• Replace metallic parts 
– Strength and stiffness 
– Retention of properties over range of temperatures 
– Toughness to withstand incidental damage 
– Dimensional stability 
• Low creep 
• Low CTE 
– Withstand environmental factors (UV, O
2
, chemicals) 
– Shaped easily 
Engineering Thermoplastics 
• Compared to commodity plastics 
– More expensive 
– The commodity resins are all lacking some 
critical property 
– Some Engineering Thermoplastics are formed 
through the condensation polymerization 
process 
Page 4


Thermoplastic Materials 
Engineering Plastics 
MFG 355 
Engineering Thermoplastics 
• Replace metallic parts 
– Strength and stiffness 
– Retention of properties over range of temperatures 
– Toughness to withstand incidental damage 
– Dimensional stability 
• Low creep 
• Low CTE 
– Withstand environmental factors (UV, O
2
, chemicals) 
– Shaped easily 
Engineering Thermoplastics 
• Compared to commodity plastics 
– More expensive 
– The commodity resins are all lacking some 
critical property 
– Some Engineering Thermoplastics are formed 
through the condensation polymerization 
process 
Polyamides or Nylons (PA) 
Page 5


Thermoplastic Materials 
Engineering Plastics 
MFG 355 
Engineering Thermoplastics 
• Replace metallic parts 
– Strength and stiffness 
– Retention of properties over range of temperatures 
– Toughness to withstand incidental damage 
– Dimensional stability 
• Low creep 
• Low CTE 
– Withstand environmental factors (UV, O
2
, chemicals) 
– Shaped easily 
Engineering Thermoplastics 
• Compared to commodity plastics 
– More expensive 
– The commodity resins are all lacking some 
critical property 
– Some Engineering Thermoplastics are formed 
through the condensation polymerization 
process 
Polyamides or Nylons (PA) 
(                                               )
n C N N C C C
O O H H H
H
H
H
[      ]
a 
[     ]
b 
Polyamides or Nylons (PA) 
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