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Polymers - Papers

Polymers

are large molecules composed of smaller molecules called monomers. Monomers are produced and either grow together or are assembled to produce a single polymer. There are synthetic and natural . Some examples of natural would be wood, starches, fingernails, and hair. Synthetic are usually referred to as plastics. Petroleum is the primary monomer used to produce . An English chemist named Alexander Parkes was the first scientist to produce the first synthetic polymer in 1862. John Wesley Hyatt, an American, was the first person to produce a useable polymer two years later. He named the product celluloid.
The prime virtue of is a high strength-to-weight ratio. ...

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with more strength and flexibility by combing two chemically different and producing a block copolymer. Combinations of block co and composites and intended for use in booster rockets and in materials of Earth-orbiting installations.
Most common are usually solid, but a new class of is being introduced in a liquid crystal state. Although these still have the physical characteristics of liquid, they are structured more like solids. Many liquid crystals are transparent at one temperature and colored at another temperature. This makes them suitable for use in liquid crystal displays, such as in digital watches, hand-held calculators, and lap-top computers. A new liquid polymer, consisting of a mixture of iron and nickel, is being used to make metal links that can be used in paper, glass, and on electronic circuit boards.
Despite the development and widespread use of , scientific understanding is still sketchy. Polymer development has occurred through trial and error. ...

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PAPER DETAILS

Added: 9/24/2007 09:16:10 AM
Category: Science & Nature
Type: Free Paper
Words: 397
Pages: 2

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