Week13Ch14

Week13Ch14 - CHAPTER 14: POLYMER STRUCTURES ISSUES TO...

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CHAPTER 14: SUES TO ADDRESS POLYMER STRUCTURES 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 - 1
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Chapter 14 – Polymers hat is a polymer? What is a polymer? Poly mer many repeat unit H H H H H H H H H H H HH H H H repeat unit repeat unit repeat unit dapted from Fig 14 2 allister 7e C C C C C C H H H H H H Polyethylene (PE) Cl Cl Cl C C C C C C H H H Polyvinyl chloride (PVC) H H Polypropylene (PP) C C C C C C CH 3 CH 3 CH 3 H Chapter 14 - 2 Adapted from Fig. 14.2, Callister 7e. Macromolecules
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Polymer Composition Hydrocarbon Most polymers are hydrocarbons i.e. made up of H and C aturated hydrocarbons Saturated hydrocarbons – Each carbon bonded to four other atoms H H H CC H H H Chapter 14 - 3 C n H 2n+2
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Chapter 14 - 4
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Unsaturated Hydrocarbons • Double & triple bonds relatively reactive – can form new bonds – Double bond – ethylene or ethene - C n H 2n CC H H H H • 4-bonds, but only 3 atoms bound to C’s – Triple bond – acetylene or ethyne - C H n- n 2n 2 CCH H Chapter 14 - 5
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Isomerism • Isomerism o compounds with same chemical formula can two compounds with same chemical formula can have quite different structures Ex: C 4 H 10 • Butane (T oiling =-0.5 o C) boiling • Isobutane (T boiling =-12.3 o C) Chapter 14 - 6
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Isomerism • Isomerism x: C 8 Ex: C 8 H 18 • n-octane HHHHHHHH C C C C C C C C H H H 3 C CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 = CH 3 H 3 CC H 2 3 () 6 2-methyl-4-ethyl pentane (isooctane) H 3 H 2 2 3 3 2,2,4-trimethylpentane (isooctane) Chapter 14 - 7
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Week13Ch14 - CHAPTER 14: POLYMER STRUCTURES ISSUES TO...

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