2.1 - constituents, relative amounts and geometry...

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Polymers (aka Plastics) organic compounds primarily based on C and H. (see periodic table) large molecular structures in a chain or network configuration atomic bonding is covalent on the chains or network and additionally there is secondary bonds acting between the chains or network. 5-95% crystalline in relatively simple structures to very complex very ductile (elastic and plastic) low density low strength low melting temp high chemical reactivity insulative polyethylene PVC rubber acrylics - O nylons - N fluoroplastics - F silicones - Si Composites Engineered materials of more than one type, usually a matrix material with fibers or particulates. Could be anything, depending on
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Unformatted text preview: constituents, relative amounts and geometry fiberglass concrete asphalt wood Semi-conductors elemental (Group IVA) compound (Groups IIIA/VA or IIB/VIA) covalent/ionic bonding similar to ceramics intermediate conductivity which is extremely sensitive to minute concentrations of impurities precise control of chemical purity allows precise control of electrical properties techniques exist to produce variations in chemical purity over very small spatial regions hence, sophisticated and minute circuitry can be produced in exceptionally small areas (This is what makes micro-circuitry possible in ICs) Si, Ge, Sn CaS GaAs...
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