EmaCh14 - 5/1/2008 CHAPTER 14: POLYMER STRUCTURES ISSUES TO...

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5/1/2008 1 Chapter 14 - 1 ISSUES TO ADDRESS. .. What are the basic microstructural features? How are polymer properties effected by molecular weight? How do polymeric crystals accommodate the polymer chain? CHAPTER 14: POLYMER STRUCTURES Chapter 14 - 2 Chapter 14 – Polymers What is a polymer? Poly mer many repeat unit Adapted from Fig. 14.2, Cal ister 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 Chapter 14 - 3 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 Chapter 14 - 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 Chapter 14 - 5 Chapter 14 - 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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5/1/2008 2 Chapter 14 - 7 Isomerism Isomerism – two compounds with same chemical formula can
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EmaCh14 - 5/1/2008 CHAPTER 14: POLYMER STRUCTURES ISSUES TO...

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