Polymers

Question 1

Chain motion during deformation

Answer 1

1. Chain deformation
2. Chain uncoiling
3. Viscous flow

Question 2

Creep test definition

Answer 2

Trying to deform past where it can recover

Question 3

3 important uses for thermal properties

Answer 3

Processing
Fabrication
Practical use of implants

Question 4

4 ways to process polymers

Answer 4

Molding
Extrusion
Spinning
Melt blowing

Question 5

3 different types of spinning (polymer processing)

Answer 5

Melt spinning- polymer heated above melt temp and forced through spinneret
Wet spinning- polymer solution forced through a spinneret and coagulated in nonsolvent bath
Electrospinning- polymer solution exposed to electrostatic field which overcomes surface tension

Question 6

What can degrade polymers

Answer 6

Light
Water
Temperature

Question 7

Degradation mechanisms
(3)

Answer 7

1. Cleavage of degradable cross links between water soluble polymer chains
2. Chemical transformation of polymer side chains resulting in formation of polar groups
3. Cleavage of unstable linkages in polymer backbone followed by solubilization of low molecular weight fragments

Question 8

Molecular and structural factors affecting hydrolysis

Answer 8

Bond stability
Hydrophobicity
Molecular weight
Morphology
Tg

Question 9

Changes in physical properties

Answer 9

Molecular weight
Tensile strength 
Weight loss of sample
Morphological changes
Molecular weight distribution
Solution viscosity

Question 10

What family polymers are in

Answer 10

Macromolecules

Question 11

5 ways to classify polymers

Answer 11

Origins
Processing
Molecular chain structure
Mechanical properties
Biostability

Question 12

Basic make up of polymers

Answer 12

C and H

Question 13

3 ways to synthesize polymers

Answer 13

Chain growth
Step growth
Free radical polymerization

Question 14

Chain growth definition

Answer 14

Repeating units having identical molecular formula to the monomer

Molecules increased size at rapid rate

Question 15

Step growth definition

Answer 15

Repeating units having fewer atoms than the monomer

Small molecules eliminated

Water usually a product