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Kevlar and its Applications. Linda Dada & Emily Dreyer Santa Rosa Junior College SRJC, Engr 45, Fall 2010. Development. 1964- Stephanie Kwolek and her colleagues at DuPont began searching for a new lightweight strong fiber for light, strong tires

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kevlar and its applications
Kevlar and its Applications
  • Linda Dada & Emily Dreyer
  • Santa Rosa Junior College
  • SRJC, Engr 45, Fall 2010
development
Development
  • 1964- Stephanie Kwolek and her colleagues at DuPont began searching for a new lightweight strong fiber for light, strong tires
  • 1965- discovery of new method of producing polymer chains
  • 1971- high strength Kevlar®

(poly-paraphenylene

terephthalamide)

introduced by DuPont

structure
Structure
  • The molecular structure includes a Benzene ring which allowed formation of structures on the ring
  • Alignment of the chains allows Kevlar to be integrated into composite materials
  • The molecules layer themselves in such a way that in order to break through Kevlar, the molecular bonds have to be broken
images
Images

Steel

Kevlar fibers

failure
Failure

Ruptured fibers

“string-cheese” failure

properties
Properties
  • High modulus
  • High tensile strength at low weight
  • Low electrical conductivity
  • High chemical resistance
  • Low thermal shrinkage
  • High toughness
  • High cut resistance
  • Flame resistant/self extinguishing
  • Immune to electron radiation
uv light
UV Light
  • Causes discoloration and degradation of the Kevlar in the presence of oxygen
  • Not influenced by moisture or atmospheric contaminants
  • Damaging if the wave is absorbed by the polymer
  • SOLUTION: It’s coated with something UV resistant (absorbant)
applications in military
Applications in Military
  • Vehicle Armor
    • Spall Liners
    • Also protects aircraft and helicopter crews
  • Military Helmets
    • Absorb 20% more kinetic energy for Ground Troops
    • Improve mobility and fatigue of GIs because of low weight
  • Body Armor
    • Improved Outer Tactical Vest, ballistic inserts, throat and groin protectors, anti-mine boots and chaps
general applications

General Applications

  • Ropes and cables
  • Auto hoses and belts
  • Composite materials
  • Tires
  • Fiber optic cables
  • Sporting goods
  • Umbilical hoses on offshore oil and gas
  • refineries
  • Insulation
transportation
Transportation
  • Aircraft
  • Maritime vessels
space applications
Space Applications
  • In the Mars Pathfinder to

reinforce the inflatable

landing cushions and

securing ropes

> survived 40 million

mile journey

  • Space shuttle and communications

satellites to protect against impacts

from orbital debris

    • Hubble Telescope!
space station
Space Station
  • Used in modules of the International Space Station (ISS) to protect from micrometeorites and orbital debris
  • Helps protect crew

from radiation

  • Basic layout of module

wall: 1. metal, 2. Kevlar,

3. main structure

(pressure shell),

4. thermal insulation

why use kevlar to protect the iss
Why use Kevlar to protect the ISS?
  • Lightweight
  • Low thermal expansion
  • Resilient
  • Woven fibers are strong and flexible
    • Flexibility absorbs shock from impacts
everyday kevlar
Everyday Kevlar
  • Fire Resistant Mattresses
  • Personal Electronics
  • Sports
    • Boarding/Skiing
    • Baseball
    • Hiking
slide16

KEVLAR UNDERWEAR!!

  • Used in the military
  • Reinforced in places that cover big arteries

Image: http://www.thefirearmblog.com/blog/2010/10/29/kevlar-reinforced-underwear/

thanks for your attention
Thanks for your attention!

Questions?

Your classmates,

Linda & Em

works cited
Works Cited
  • http://www2.dupont.com/Kevlar/en_US/
  • http://www.lbl.gov/MicroWorlds/Kevlar/index.html
  • www.nasa.gov/
  • http://www.nasa.gov/multimedia/imagegallery