CHEM 1000 Lecture Notes - Lecture 23: Polyvinyl Chloride, Polytetrafluoroethylene, Nylon 6

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30 Nov 2017
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Sections 10. 1 10. 6 different types of polymers; properties of polymers. Polymers word polymer is derived from greek (poly = many) (mer come from meros = part) Consist of many smaller molecules (monomers) that are connecte to form the larger macromolecule. Hundreds, even thousands, of monomer units combine ot make one polymer molecule. Natural polymers many natural substances exist as polymers (starch, cotton. Celluloid produced by treating cellulose with nitric acid. Thermoset polymer heated to harden, forming a crosslink network; cannot be melted or remolded; decomposed when heated at high temperature. Polyethylene (one of the most common synthetic polymers) High-density polyethylene (hdpe) most linear molecules that pack closely together; pack closely together, well-ordered, crystalline structure; rigid and have good tensile strength. Low-density polyethylene (ldpe) more highly branched form of polyethylene; not crystalline; flexible. Addition polymerization monomers add to one another in such a way that the resulting polymer contains all atoms that are present in the monomers.