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Student%20Notes%20CHM115-F09-Lecture%2025%28revised%29

Student%20Notes%20CHM115-F09-Lecture%2025%28revised%29 -...

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1 CHM 115 Lecture 25 Today’s Lecture Reading was KTT: Section 10.5 on Polymers Polymers Properties Talking Polymers Recycling Next Lecture Read Sections 13.1, 13.2, 13.4
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Polymers from Addition Reactions Monomer Polymer Ethylene CH 2 = CH 2 polyethylene Propylene CH 3 CH = CH 2 polypropylene Styrene C 6 H 5 CH = CH 2 polystyrene Vinyl chloride CH 2 = CHCl PVC CH 2 = CHCl–CH 2 = CH 2 –CH 2 CHCl = CH 2 CH 2 - (Chloroprene) (neoprene) CH 3 natural rubber –CH 2 CH = CH 2 CH 2 - 2
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Condensation Polymers Reaction between two molecules to produce a polymer and another small molecule Often water In lab when you made nylon it was HCl 3
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Polymer Properties Determined by structure Linear, branching, cross-linking Side Chains Intermolecular forces H-bonding Dipole-dipole attractions London forces 4
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Commercial Polymers Polyesters This is the first step in formation of a polyester. 5
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Commercial Polymers Polyesters Dacron, Mylar 6
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Commercial Polymers Polyamides 7
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Commercial Polymers Polyamides Nylon Kevlar 8
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Kevlar H bond Dipole-dipole IMF Fibers of Kevlar consist of long molecular chains produced from poly-paraphenylene terephthalamide.
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