Lecture 6 - Polymer Structures Learning Objectives Polymers...

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1 Polymer Structures Polymer Structures Learning Objectives Learning Objectives • Polymers: – Describe a typical polymer molecule in terms of its chain structure – Calculate number-average and weight-average molecular weights and degree of polymerization – Differentiate between thermoplastic and thermoset polymers
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2 Polymers Polymers What is a polymer? Poly mer many repeat unit Adapted from Fig. 14.2, Callister 7e. C C C C C C H H H H H H H H H H H H Polyethylene (PE) Cl Cl Cl C C C C C C H H H H H H H H H Polyvinyl chloride (PVC) H H H H HH Polypropylene (PP) C C C C C C CH 3 H H CH 3 CH 3 H repeat unit repeat unit repeat unit Ancient Polymer History Ancient Polymer History Originally natural polymers were used Wood – Rubber Cotton – Wool Leather – Silk Oldest known uses Rubber balls used by Incas Noah used pitch (a natural polymer) for the ark
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3 Polymer Composition Polymer Composition Most polymers are hydrocarbons i.e. made up of H and C Saturated hydrocarbons Each carbon bonded to four other atoms C n H 2n+2 CC H H H H H H Hydrocarbons Intramolecular covalent bonding saturated - single bonds between C and H (diagram) unsaturated - double or triple bonds between C
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4 Unsaturated Hydrocarbons Unsaturated Hydrocarbons Double & triple bonds relatively reactive – can form new bonds Double bond – ethylene or ethene - C n H 2n 4-bonds, but only 3 atoms bound to C’s Triple bond – acetylene or ethyne - C n H 2n-2 CC H H H H CCH H
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5 Isomerism Isomerism Isomerism two compounds with same chemical formula can have quite different structures Ex: C 8 H 18 n-octane 2-methyl-4-ethyl pentane (isooctane) CCCCCCCC H H H H H H H H H H H H H H H H H H H 3 CC H 2 CH 2 CH 2
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This note was uploaded on 06/24/2009 for the course MEEN 222 taught by Professor Radovic during the Fall '08 term at Texas A&M.

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Lecture 6 - Polymer Structures Learning Objectives Polymers...

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