05-05-2014, 12:21 PM
Polymers in Automobiles
Polymers in Automobiles.ppt (Size: 558 KB / Downloads: 252)
Why use plastics?
Oil Embargo (1970’s) and Japanese Competition
Compete with other materials based on:
Weight savings
Design flexibility
Parts consolidation
Ease of fabrication
Engine
ULTEM polyetherimide (PEI) resin to replace aluminum under the hood for 1st time
High-performance amorphous resin from GE
Complete air management modules can be made of thermoplastic
Choosing a material:
1. Cost
2. Flexural Modulus
3. Coefficient of Thermal Expansion
4. Chemical Resistance
5. Impact Resistance
6. Heat Deflection Temperature (HDT)
Applications of SMC
Growth of applications
- Body panels on GM’s Lumina, TransPort, and
Silhouette
- Structural components - valve covers, grille-
opening reinforcements, fascia supports, etc.
Polyisoprene Rubber (IR)
Same cis structure as NR, but also contains low levels of 3,4 and trans 1,4 polyisoprene.
Above structures prevent stress crystallization and thus has lower tensile and tear properties.
300,000 to 500,000 MW.
Other properties similar to NR .