Kevlar

C14N2O2H10

A Kevlar monomer contains 14 carbon atoms, 2 nitrogen atoms, 2 oxygen atoms and 10 hydrogen atoms. The reason why Kevlar can be used in extreme conditions such as bullet shots and intensive heat, is greatly due to the hydrogen bonds that strengthen the monomers making it into strong, polymer chain.
800px-Kevlar_chemical_structure_H-bonds.png
Image 1
Kevlar is a synthetic polymer that is not biodegradable, recyclable, or renewable. Cross-linkage between hydrogen and oxygen occurs, because oxygen is negative and hydrogen is a positive, they always attract forming hydrogen bonds which is why Kevlar is so strong. This picture shows the Kevlar monomer in bold. This picture of Kevlar contains the crossover connections with the nitrogens and hydrogens that are bonding and giving Kevlar its strength.



Physical Properties

Kevlar has high resistance to heat and maintains its strength and resilience to temperatures reaching -196 C. Kevlar is actually stronger at lower temperatures due to tighter bonds between the monomers. At 450 C Kevlar sublimates, meaning it goes from solid to gas without a liquid stage.



Chemical Properties

Kevlar is a man made compound and cannot be found in a natural environment. Kevlar is made with aqeous solutions and comes out in a precipitate that is drawn into fibers .Kevlar is structurally rugged, it has low electrical conductivity, it has high chemical resistance, low thermal shrinkage, its very durable, excellent dimensional stability, a high cut-resistance, it is flame resistant and self extinguising. I think batman's suit is made from kevlar so we also know it look badass too.



Uses

Kevlar-String-Knit-Glove.jpg
Image 2

The natural and practical uses of Kevlar are: bulletproof ballistic vests for law enforcement officers, ropes, armor on vehicles

such as military Hummer and Tanks, bikes, trampolines, tennis rackets and sails. It is also

used
kevlar-vest.jpg
Image 3
in hockey sticks, professional racers use it as a flame retardant suit, gloves, kayaks, skis, fiber optics,

tires, and a shrapnel resistant covering in a jet. Marine biologists also use it as a main component in shark suits due to it's resistance to penetration, like if a shark bit your arm.



History

Stephanie Louise Kwolek of DuPont joined DuPont in 1946 with a chemistry degree from Carnegie Institute of Technology. She began her research in polymer chemistry, and in 1964 she began experimenting with poly-p-phenylene-terephthalate (PPD-T) and polybenzamide. And in 1971 Kevlar was born it was the first organic fiber with sufficient tensile strength and modulus to be used in advanced composites.





Sick Video

Filmed by Renee Montpetit and written and directed by Ian Dohm. (Ali thought it was dumb)

Citations

"Kevlar-The Wonder Material." 14 May 2008 <http://www.lbl.gov/MicroWorlds/Kevlar/>.</span>
Caswell, Adam. "Kevlar." 14 May 2008 <http://137.229.52.42/212_fall2003.web.dir/adam_caswell/page1.htm>.</span>
"Kevlar." Dupont. 14 May 2008 <http://www2.dupont.com/Products/en_RU/Kevlar_en.html>.</span>
"Kevlar." BBC. 15 08 2002. 14 May 2008 <http://www.bbc.co.uk/dna/h2g2/A791291>.</span>


Pictures

Image 1
http://www.cheme.washington.edu/images/cent/kevlar-vest.jpg
Image 2
http://www.warwickmills.com/SafetyGloves/Kevlar-String-Knit-Glove.jpg
Image 3
http://en.wikipedia.org/wiki/Image:Kevlar_chemical_structure_H-bonds.png