Mylar Strip

Mylar Strip

Neoprene   by hi joiney

History

Julius Nieuwland performed the early work on basic reactions involving vinyl-acetylene that was later used by DuPont chemists to create the synthetic rubber, neoprene (1931).

Neoprene was invented by DuPont scientists on 17th April 1930 after Dr. Elmer K. Bolton of DuPont laboratories attended a lecture by Fr. Julius Arthur Nieuwland, a professor of chemistry at the University of Notre Dame. Fr. Nieuwland's research was focused on acetylene chemistry and during the course of his work he produced divinyl acetylene, a jelly which firms into an elastic compound similar to rubber when passed over sulfur dichloride. After DuPont purchased the patent rights from the university, Wallace Carothers of DuPont took over commercial development of Nieuwland's discovery in collaboration with Nieuwland himself. DuPont focused on monovinyl acetylene and reacted the substance with hydrogen chloride gas, manufacturing chloroprene.

Neoprene, which was originally called duprene, was the first mass-produced general-purpose synthetic rubber.

Applications

General

Neoprene's chemical inertness makes it well suited for industrial applications such as gaskets, hoses, and corrosion-resistant coatings. It can be used as a base for adhesives, noise isolation in power transformer installations, and as padding in external metal cases to protect the contents while allowing a snug fit. Neoprene weather stripping is commonly used in fire doors as its fire resistance is higher than exclusively hydrocarbon based rubbers, also resulting in its appearance in combat related attire such as gloves and face masks. Neoprene is also used as a contrast in some jewelry designs.

Aquatics

Neoprene is commonly used as a material for fly fishing waders, as it provides excellent insulation against cold. Neoprene waders are usually about 5 mm thick, and in the medium price range as compared to cheaper materials such as nylon and rubber. However, neoprene is less expensive than breathable fabrics.

In its native state, neoprene is a very pliable rubber-like material, with no better insulating properties than rubber or other solid plastics. For diving and exposure protection applications, neoprene is manufactured by foaming the plastic with nitrogen gas, for the insulation properties of the tiny enclosed and separated gas bubbles (nitrogen is used for chemical convenience, not because it is superior to air as an insulator). The foam cells thus created also make the material quite buoyant, and the diver must compensate for this by wearing weights. Thick wet suits made at the extreme end of their cold water protection are usually made of 7 mm thick neoprene. It should be noted that since foam neoprene contains gas pockets, the material compresses under water pressure, getting thinner at greater depths; a 7 mm neoprene wet suit offers much less exposure protection under one hundred feet of water than at the surface. A recent advance in neoprene for wet suits is the "super-flex" variety, which mixes spandex into the neoprene for a greater flexibility.

As a result wetsuit neoprene sheet is manufactured in different grades dependant on the application. Diving suit neoprene is denser and less flexible; this ensures its durability and reduces compression at depth. Sailing wetsuits are never exposed to large compressive forces so contain more gas, so are warmer for the same thickness. Competetive swimming wetsuits are made of the most expanded foam; they have to be very flexible to allow the swimmer unrestricted movement. The downside is that they are quite fragile.

Home accessories

Recently, neoprene has become a favorite material for lifestyle and other home accessories including laptop sleeves, iPod holders, remote controls and cycling chamois.

Sports

Also in recent years, Jug, an after-market inline skate liner manufacturer, has incorporated neoprene into the construction of some of their more popular product-lines, citing that neoprene adds reinforcement (ankle support) and guards against abrasions like few materials do. As a simple matter of durability and product lifespan, liners constructed with neoprene additives are typically more expensive than those which are not.

Neoprene is a popular material in the equestrian world as well; it is used in cinches, saddle pads, bareback pads, and many other applications in all disciplines.

Music

Musical instrument maker Yamaha has begun replacing corks not used for sealing (such as sealing the joints of a clarinet or oboe) with neoprene. Neoprene is also used for drum practice pads.

Other

Neoprene is used for Halloween masks and masks used for face protection, for insulating CPU sockets, to make waterproof automotive seat covers, in liquid and sheet-applied elastomeric roof membranes or flashings, and in a neoprene-spandex mixture for manufacture of wheelchair positioning harnesses. In fashion, neoprene has been used by designers such as Balenciaga, Lanvin, and Vera Wang.

Precautions

Although neoprene itself is not a skin contact sensitizer, certain neoprene adhesives contain 4% rosin (CAS No. 8050-09-7, previously known as "colophony"), which is a skin contact sensitizer under the European Union Dangerous Preparations Directive 1999/45/EC. Some people are allergic to neoprene while others can get dermatitis from thiourea, a compound used to vulcanize rubber into neoprene which can be left over after the manufacturing process.[citation needed]

Lead-containing compounds, such as litharge (lead(II) oxide), are used as compounding agents to prepare finished products made of neoprene, and these can have a toxic effect on human blood, kidneys, and reproductive systems.

References

Look up Neoprene in Wiktionary, the free dictionary.

Wikimedia Commons has media related to: Neoprene

^ a b c "Technical information Neoprene" (PDF). Du Pont Performance Elastomers. October 2003. http://www.dupontelastomers.com/literature/neoprene/585E7A59DA93810F6B1A7900D3712585.pdf. 

^ The Ten-Year Invention: Neoprene and Du Pont Research, 1930-1939 by John K. Smith, Published by The Johns Hopkins University Press

^ "Neoprene - polychloroprene". DuPont Elastomers. http://www.dupontelastomers.com/Products/neoprene/neoprene.asp?id=wikineo. Retrieved 2008-04-09. 

v  d  e

E.I. du Pont de Nemours and Company (DuPont)

Corporate directors

Samuel Bodman  Richard H. Brown  Robert A. Brown  Bertrand P. Collomb  Curtis J. Crawford  Alexander M. Cutler  There du Pont  John T. Dillon  Marillyn Hewson  Lois Juliber  Ellen J. Kullman  William K. Reilly

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Categories: Elastomers | Dielectrics | DuPont | Brand name materials | DuPont productsHidden categories: Articles needing additional references from February 2008 | All articles needing additional references | All articles with unsourced statements | Articles with unsourced statements from January 2008

About the Author

I am Frbiz Site writer, reports some information about silicon ingot, elastomeric bearing.

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