The history of kevlar

Origin Original Batsuit While in his study thinking over a method on how to be a more effective crime fighter and a solution on the means of fighting injustice, Bruce Wayne saw a bat through his window. Realizing that the only way to fight the criminals, the crime and the evil of this world was to adopt a symbol Bruce adopts the persona of a bat in order to conceal his identity and to strike fear into his adversaries.

The history of kevlar

History Stephanie Kwolekan American chemist of Polish origin, inventor of kevlar Poly-paraphenylene terephthalamide — branded Kevlar — was invented by Polish-American chemist Stephanie Kwolek while working for DuPont, in anticipation of a gasoline shortage. Inher group began searching for a new lightweight strong fiber to use for light but strong tires.

However, Kwolek persuaded the technician, Charles Smullen, who ran the spinneretto test her solution, and was amazed to find that the fiber did not break, unlike nylon. Her supervisor and her laboratory director understood the significance of her accidental discovery and a new field of polymer chemistry quickly arose.

Bymodern Kevlar was introduced. The result has liquid-crystalline behavior, and mechanical drawing orients the polymer chains in the fiber's direction.

The history of kevlar

Hexamethylphosphoramide HMPA was the solvent initially used for the polymerizationbut for safety reasons, DuPont replaced it by a solution of N-methyl-pyrrolidone and calcium chloride. As this process had been patented by Akzo see above in the production of Twarona patent war ensued.

Kevlar K49 The history of kevlar high modulus used in cable and rope products. When Kevlar is spunthe resulting fiber has a tensile strength of about 3, MPa, [14] and a relative density of 1.

The polymer owes its high strength to the many inter-chain bonds. These inter-molecular hydrogen bonds form between the carbonyl groups and NH centers. Additional strength is derived from aromatic stacking interactions between adjacent strands.

These interactions have a greater influence on Kevlar than the van der Waals interactions and chain length that typically influence the properties of other synthetic polymers and fibers such as Dyneema.

The presence of salts and certain other impurities, especially calciumcould interfere with the strand interactions and care is taken to avoid inclusion in its production. Kevlar's structure consists of relatively rigid molecules which tend to form mostly planar sheet-like structures rather like silk protein.

Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. March Protection Cryogenics Kevlar is often used in the field of cryogenics for its low thermal conductivity and high strength relative to other materials for suspension purposes.

It is most often used to suspend a paramagnetic salt enclosure from a superconducting magnet mandrel in order to minimize any heat leaks to the paramagnetic material. It is also used as a thermal standoff or structural support where low heat leaks are desired.

Armor Pieces of a Kevlar helmet used to help absorb the blast of a grenade Kevlar is a well-known component of personal armor such as combat helmetsballistic face masksand ballistic vests. Other military uses include bulletproof facemasks and spall liners used to protect the crews of armoured fighting vehicles.

Nimitz-class aircraft carriers use Kevlar reinforcement in vital areas. Kevlar-based protective gear is often considerably lighter and thinner than equivalent gear made of more traditional materials.

Personal protection It is used for motorcycle safety clothingespecially in the areas featuring padding such as shoulders and elbows. In fencing it is used in the protective jackets, breeches, plastrons and the bib of the masks. It is increasingly being used in the peto, the padded covering which protects the picadors' horses in the bullring.

Speedskaters also frequently wear an under-layer of Kevlar fabric to prevent potential wounds from skates in the event of a fall or collision.

Equipment In kyudoor Japanese archeryit may be used as an alternative to more expensive[ citation needed ] hemp for bow strings. It is one of the main materials used for paraglider suspension lines.

In table tennis, plies of Kevlar are added to custom ply blades, or paddles, in order to increase bounce and reduce weight. Tennis racquets are sometimes strung with Kevlar.

It is used in sails for high performance racing boats.The original Batsuit was a simple design with very few special enhancements. The first costume that Bruce wore consisted of a two-piece grey body suit with a bat-shaped emblem sewn into the chest region.

The History of the Bulletproof Vest Throughout history, people have protected themselves from injury with different types of materials. In the earliest days, people used animal skins as barriers to injury and attacks. Manufacturing Operations - PO Box Thacher Street Hornell, NY © All rights reserved.

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The history of kevlar

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Kevlar® aramid fiber | DuPont | DuPont USA