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Lecture26%20with%20slides - Polymers What is a polymer...

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1 1 Lecture 26 Polymers 2 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 H H Polypropylene (PP) C C C C C C CH 3 H H CH 3 CH 3 H repeat unit repeat unit repeat unit 3 Ancient Polymer History Originally natural polymers were used – Wood – Rubber – Cotton – Wool – Leather – Silk 4 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 C C H H H H H H 5 6 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 C C H H H H C C H H
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