ARCH 2044 Chapter Notes - Chapter 4: Polycarbonate, Thermal Expansion, Polypropylene
18 Dec 2016
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Properties i. ii. iii. iv. v. vi. vii. Can be molded and formed into complex shapes. Construction details must allow for substantial amount of expansion and contraction due to temperature changes viii. ix. x. Plastics - chainlike molecular structures that are made by either altering natural products or by transforming petroleum, natural gas, or coal products into an object i. Most synthetic plastics = crude oil (8% of the world"s oil resources) c. d. Contain carbon; combine with other atoms to form rings or chains at the chemical level. Polymer - long chain of molecules i. ii. Capable of being molded, extruded, cast, or drawn into filaments e. f. Examples/uses: a) b) c) d) e) f) g) h) i) Acrylics (pmma) - glazing, adhesives, caulking, latex paints. Cellulosic (cab) - pipe and pipe fittings, adhesives. Nylons (polyimides - pa) - synthetic fibers and filaments, hardware. Polycarbonates (pc) - safety glazing, lighting fixtures, hardware.
