Chemistry of Kevlar - University of Bristol

Kevlar is a type of fibre called an , short for 'aromatic polyamide', in which the molecules form long, highly-oriented chains. The fibres can be spun or woven into mats or fabrics to exploit these exceptional properties.

25/10/2007 · Synthesis and characterization of activated carbon fibers from Kevlar

On the other hand, it is an excellent material for F1 bodywork, and tyres. As radial cord material, it works well for a couple reasons. It is not a massive part of the entire tyre or necessarily even the cord. Bridgestone, Michelin and Pirelli F1 use a multi layered, multi composite cord approach, and Kevlar is used, either pure as one or more layers, or layered and interlayered as a composite as part of an individual layer. layered together and in a tight construction, it holds up pretty well to flex for as long as it needs to, which isn't very long in an F1 tyre. It's also very resistant to high temperatures, and it is usually used in tyre technology as an anti puncture layer, since it is the same material Bullet Proof vests are made from, so it works well. You do have to remember, that some flex is wanted in an F1 tyre, the Kevlar from what I have been told, gives them a better fluxuation in the casing for better variable damping effects from compound to compound.
Some parts of F1 bodywork must be, by the FIA rules covered by Kevlar. For example must have final layer made of Kevlar to hold the carbon fiber together in the event of a collision. That will prevent breaking of carbon fiber elements in small pieces. Internal layer of survival cell () must be made of Kevlar to prevent penetration of front members inside the tub and hurting driver's legs. This rule was imposed after Michael Schumacher crash in Silverstone, when left front suspension wishbone penetrated monocoque and broke Michael's leg.
In driver helmets, one or more of the layers is made from Kevlar to prevent penetrations in case of incidents.


Kevlar - Molecule of the Month November 2010 - …

Kevlar derives its strength from intra-molecular hydrogen bonds and phenyl stacking interactions between aromatic groups in neighboring strands.

Kevlar fiber is a high strength organic synthesis fiber material. It has the character of high hardness, high toughness, lightweight and high resistance to abrasion.


Kevlar® aramid fiber | DuPont | DuPont USA

The structural foam is a very unique product. First, do not confuse structural foam with flotation foam. Structural foam is available in various density and thickness. Structural foam is available in sheets like plywood. It can be sawed to pattern and even sawed partially through in strips to allow conformation to curved surfaces. Density ranges from “finger compressible” to nearly solid. Two primary characteristics make PVC structural foam the very best solution for boat building. First, it is a closed cell foam and is totally immune to water. Water does not deteriorate it. Water does not saturate it. Second and just as important, it is highly absorbent of vibration and shock. It does not fail structurally just from vibration and shock as flotation foam will. Flotation is only a by-product of construction with PVC foam. When used as the “core” of a laminate sandwich between fiberglass or Kevlar outer layers, the entire structure is a flotation device. Being closed cell and impervious to water, a careless hole drilled through the outer skin is not going to totally compromise the integrity of the structure. That being said, it should also be noted that the gel coat outer skin is the primary water barrier in fiberglass boat construction. For the best long term durability, any breach of this outermost skin should be sealed as soon as possible with appropriate repair materials and techniques.

KEVLAR- PROPERTIES AND APPLICATIONS - SlideShare

Composite lamination of various combinations of synthetic material surfaced as the most rigid and lightest weight solution. Composite lamination was nothing new. Finding the best synthetic replacement for wood was now the issue. Each new product examined had its’ own set of problems. Finally, after literally years of investigation, a combination of fiberglass, Kevlar, poly-vinyl chloride structural foam, and resin for bonding provided the best strength to weight ratio and ultimate long-term durability.

KEVLAR- PROPERTIES AND APPLICATIONS ..

Creating the plastic:
- purely chemical process
- Kevlar is a complex polyamide which are formed through condensation reactions of ammonia-like chemicals and organic acids Forming the Fibers:
-Kevlar naturally forms rod-like shapes due to molecular structure
-through a process called "wet spinning" the rods line up in the same direction, increasing the number of hydrogen bonding opportunities
- the fiber that forms is super strong The hydrogen bonds formed in the synthesis of Kevlar are directly responsible for its high-tensile strength.