Chapter 14- Polymer Structures

Chapter 14 Polymer - CHAPTER 14 POLYMER STRUCTURES ISSUES TO ADDRESS What are the basic microstructural features How are polymer properties

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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
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Chapter 14 - 2 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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Chapter 14 - 3 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
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Chapter 14 - 4 Polymer Composition Most polymers are hydrocarbons i.e. backbone is made up of H and C atoms Saturated hydrocarbons C n H 2n+2 (alkanes) Each carbon bonded to four other atoms C C H H H H H H Ethane C 2 H 6
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Chapter 14 - 5
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Chapter 14 - 6 Unsaturated Hydrocarbons Double & triple bonds relatively reactive – can form new bonds – Double bond – alkenes - C n H 2n Ethylene C 2 H 4 4-bonds, but only 3 atoms bound to C’s – Triple bond – alkines - C n H 2n-2 C C H H H H C C H H Acetylene C 2 H 2
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Chapter 14 - 7 Isomerism Isomerism two compounds with same chemical formula can have quite different structures – Ex: C 4 H 10 n-butane • isobutane
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This note was uploaded on 04/02/2008 for the course MSE 200 taught by Professor Wholedepartment during the Spring '08 term at N.C. State.

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Chapter 14 Polymer - CHAPTER 14 POLYMER STRUCTURES ISSUES TO ADDRESS What are the basic microstructural features How are polymer properties

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