Week13_Tu_Chapter12

Week13_Tu_Chapter12 - m n - how large is n in (C 2 H 4 ) n...

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Chapter 12.1 - Polymers Issues to address… How are polymer synthesized? How are polymers classified? What advantages do polymers offer us? 375x
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What is a polymer? Poly mer (monomer) Polyethylene (PE) Polyvinyl chloride (PVC) repeat unit C C C C C C H H H H H H H H H H H H repeat unit Cl Cl Cl C C C C C C H H H H H H H H H
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Polymerization Chain growth (addition polymerization) Unsaturated bonds Step growth (condensation polymerization) Reactive function groups
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Chain Growth (Addition Polymerization)
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Copolymer an Intimate Solution of Different Types of Monomers
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Blend Polymer
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Step Growth (Condensation Polymerization)
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Bifunctional Monomer (Linear Molecular Structure) C C H H H H
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Polyfunctional Monomer (Network Molecular Structure)
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Degree of Polymerization
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Unformatted text preview: m n - how large is n in (C 2 H 4 ) n Molecular weight m is the molecular weight of the mer Become soft and deformable upon heating Ex: polyethylene. Secondary bonding (van der Waals bonding) T g Recyclable Thermoplastic Polymers Figure 6.40 Thermosetting Polymers Become hard and rigid upon heating Epoxy Do not have a sharply defined glass-transition temperature Strength and hardness are not affected by temperature If T is sufficiently high, thermosetting polymer begins to burn up, degrade. Non-recyclable Metals vs Polymers Corrosion Resistant...
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Week13_Tu_Chapter12 - m n - how large is n in (C 2 H 4 ) n...

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