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chapter_12revB - Insulators The energy band gap in...

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Unformatted text preview: Insulators The energy band gap in insulating materials is very high, greater than ~350 kJ/mol. They are not conductive. Ceramics Ceramics are inorganic solids, usually hard and brittle. They are highly resistant to heat, corrosion, and wear. Ceramics do not deform under stress. They are much less dense than metals are used in their place in many high-temperature applications. Superconductors At very low temperatures, some substances lose virtually all resistance to the flow of electrons. Much research has been done recently into the development of high-temperature superconductors. Superconductors The development of higher and higher temperature superconductors will have a tremendous impact on modern culture. Types of Inorganic Crystals Addition Polymers Made by coupling the monomers by converting π-bonds within each monomer to σbonds between monomers. Ethylene Polyethylene Condensation Polymers: Made by joining two subunits through a reaction in which a smaller molecule (often water) is also formed as a by-product. These are also called copolymers. Nylon is one example of a condensation polymer. Properties of Polymers Interactions between chains of a polymer lend elements of order to the structure of polymers. ...
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