09-16-Lecture

09-16-Lecture - 1 Polymers ENGR 213 2 Historical Importance...

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Unformatted text preview: 1 Polymers ENGR 213 2 Historical Importance of Materials HYDROCARBONS ➜ intramolecular covalent bonding H ➤ saturated - single bonds between C e.g., methane CH 4 H - C - H H ➤ unsaturated - double or triple bonds between C e.g., acetylene C 2 H 2 H - C = C - H ➜ isomers - same composition, different structure (different properties) e.g. butane ➜ Several common groups / radicals ➤ methyl (CH 3 ), ethyl (C 2 H 5 ), & phenyl (C 6 H 5 ) POLYMERS ➜ mostly organic, can be natural or synthetic ➜ macromolecules - composed of many hydrocarbons ➤ generally in long, flexible chain ➤ C backbone ➤ side-bonds w/ atoms or groups / radicals ➤ mer = basic repeating building block ➤ monomer - a 1-mer molecule ➤ polymer - a many-mer molecule polyethylene chain structure 5 EXAMPLE MERS polyethylene polyvinyl chloride polypropylene CH3 (methyl) Cl SOME COMMON MERS Table 4.3 aromatic ring POLYMER TYPES ➜ homopolymers : single mer type ➜ copolymer : more than one mer type per molecule...
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This note was uploaded on 03/26/2008 for the course ENGR 213 taught by Professor Dr.stubbs during the Fall '04 term at Texas A&M.

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09-16-Lecture - 1 Polymers ENGR 213 2 Historical Importance...

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