ENGR2000_polymers - Introduction to Engineering Materials...

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Introduction to Engineering Materials ENGR2000 Chapter 14: Polymer Structures Dr. Priya Thamburaj Goeser
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14.1 Introduction • Naturally occurring polymers – Wood, rubber, cotton, wool, leather, silk • Synthetic polymers – Plastics, rubbers, fibers
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14.2 Hydrocarbon Molecules • Many organic materials are hydrocarbons • Covalent bonding
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Saturated & Unsaturated hydrocarbons • Molecules with all single bonds • No new atoms may be joined without the removal of others that are already bonded • Molecules with double or triple covalent bonds
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14.3 Polymer Molecules • Polymers are often called macromolecules • Covalent bonds • Molecules in the form of long & flexible chains
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• Mer units - structural entities which are repeated along the chain • Polymer – many mers • Monomer – a stable molecule from which a polymer is synthesized
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14.7 Molecular Structure • Characteristics of a polymer depend on – Its molecular weight – Molecular shape – Structure of molecular chains
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ENGR2000_polymers - Introduction to Engineering Materials...

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