Copolymer Structures

1
Copolymer Structures
Random
Alternating
Block
Graft
2
Crystallinity

• Thermoplastics
• Crystallinity improves strength and stiffness
• Degree of crystallinity
• Linear polymers crystallize more readily than
  x-linked, or branched.

3

• Complex polymers tend to be amorphous
• Crystallinity can be induced by controlling
  cooling rates during forming
• Slow cooling favours crystallinity
• Crystallinity can be induced by plastic
  deformation (cold work)
• Amorphous polymers are translucent
• Crystallinity increases opacity.

4
Polymer Crystal
PE crystal