CHAPTER 15

Question 1

What are the types of behaviours of each type of polymers?

Answer 1

-Aligned/Crosslinked/Network polymers: Brittle behavior
-Semicrystalline polymers: Plastic behavior
-Elastomer polymers: Elastic behavior

Question 2

What factors affect Tm and Tg?

Answer 2

-Tm and Tg increase with increasing chain stiffness
-Tm affected by regularity of repeat unit arrangements

Question 3

How is chain stiffness increased?

Answer 3

With the presence of:
1) Bulky side groups
2) Polar groups or side groups
3) Chain double bonds and aromatic chain groups

Question 4

What do fillers do polymers?

Answer 4

Improve tensile strength and abrasion resistance, toughness

Question 5

What do plasticizers do to polymers?

Answer 5

Reduce the glass transition
Transforms brittle polymer to a ductile one

Question 6

What do stabilizers do to polymers?

Answer 6

Antioxidants
UV protectants

Question 7

What do lubricants do to polymers?

Answer 7

Allow easier processing
Polymer slides through dies easier