Basic Dynamic Viscoelastic Properties Review – (Approximately 1 Hour)
1. Elastomer Viscoelastic Characteristics
a. Hooke’s Law – Elastic Behavior
b. Newton’s Dashpot Model – Viscous Behavior
c. Elastomer Phases With Temperature Change
d. Viscoelastic Curve
e. Time-Temperature Superposition Theory
2. Viscoelastic Properties Definitions
a. Elastic or Storage Modulus
b. Viscous or Loss Modulus
c. Tan Delta
d. Complex Modulus
e. Loss Compliance
3. Measuring Viscoelastic Properties
a. Forced Vibration Instruments
b. Free Vibration Instruments
4. Laboratory Viscoelastic Properties Versus Tire Performance
a. Wet Traction and Wet Handling
b. Dry Traction
c. Dry Handling
d. Rolling Resistance
e. Winter Snow Traction
f. Ice Traction
g. Tread-life
h. Irregular Wear
i. Mullins Effect
j. Payne Effect
5. How Compound Materials Affect Viscoelastic Properties
a. Polymer Structure
i. Backbone Flexibility
ii. Bulkiness of Side Groups
iii. Steric Hindrance
iv. Flexibility of Side Groups
v. Symmetry of Side Groups
vi. Homogeneous versus Heterogeneous
vii. Molecular Weight
viii. Branching
ix. Chemical Modification
b. Fillers
i. Rubber Reinforcement
ii. Types of Fillers
iii. Carbon Black
iv. Silica
v. Silica – Carbon Black Comparisons
vi. Titanium Dioxide
vii. Clay
viii. Resins
ix. Plasticizers, Oils, Process Aids
x. Vulcanization System
6. Compounding Trade-offs
