They are trade names.
As "kevlar" is in fact the trademark of a type of aramid fiber, it may be capitalized (Kevlar) -- or lower-cased, as one often sees with "xerox". [see http://unterm.un.org/DGAACS/unterm.nsf/8fa942046ff7601c85256983007ca4d8/12ce03301316620685256a000007676a?OpenDocument]
plastic - grocery bags polyester - clothes rubber - balls nylon - fabric teflon - skillets polystyrene - styrofoam cups bakelite - old telephones kevlar - bulletproof jackets polyisoprene - latex rubber balloons
Because it's a registered trade name of a product.
Teflon is a trade name for PolyTetraFluoroEthylene -PTFE. It is made by polymerization of Tetra Fluoro Ethylene CF2=CF2 and thus because it is a synthetic polymer it is generically called a plastic and in addition it has properties of a plastic.
Freon is a gas used in refrigerators while Teflon is a nonstick substance used in pans.
As "kevlar" is in fact the trademark of a type of aramid fiber, it may be capitalized (Kevlar) -- or lower-cased, as one often sees with "xerox". [see http://unterm.un.org/DGAACS/unterm.nsf/8fa942046ff7601c85256983007ca4d8/12ce03301316620685256a000007676a?OpenDocument]
"Thermos" gets a capital letter because it is a proper noun that is derived from the company's trademark. Just like brand names such as Coca-Cola or Nike, "Thermos" is treated as a proper noun and thus is capitalized.
Nylon, neoprene, teflon, kevlar...
no, it isn't. Kevlar is the material in bulletproof vests
Lycra Thinsulate Carbon Fibres Kevlar Teflon
plastic - grocery bags polyester - clothes rubber - balls nylon - fabric teflon - skillets polystyrene - styrofoam cups bakelite - old telephones kevlar - bulletproof jackets polyisoprene - latex rubber balloons
Teflon is the outer material of the vest. The ACTUAL STOPPING material is more then likely going to be Kevlar.
The first John Deere tractor is in the Messick Agriculture Museum in Harrington, DE. DuPont's headquarters is located in Delaware. DuPont created polymers such as Vespel, neoprene, nylon, COrian, Teflon, Mylar, Kevlar, Sorona and Lycra.
Teflon is a synthetic polymer which means that it is man-made. There are many polymers that are also found in nature.
Many organic polymers are chains of repeating elements. These include biopolymers such as starches, glycogen, cellulose (polysaccharide chains), DNA, RNA (nucleotide chains with constant backbone but different nitrogenous bases at each position) and protein, (polypeptide chains with constant backbone but different substituent groups at each position), and other technically organic polymers such as PVC, Teflon, and Kevlar.
Examples: polymers as nylon, teflon, PET; synthetic lubricants; pharmaceuticals; dyes; inks.
a monomer Polymers are composed of monomers.