ENGR 240 - 9.26.07

ENGR 240 - 9.26.07 - ENGR 240 Polymers(macromolecules o...

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ENGR 240 – September 26, 2007 Polymers (macromolecules) o Naturally occurring Rubber Wood Silk Leather o Synthetic polymers Plastics Fiber materials Rubber Facts about Polymers o Polymers are cheaper and relatively easy to modify properties o Polymers are long flexible chains o Most commonly a backbone of carbon atoms | | | | | | – C – C – C – C – C – C – | | | | | | bonds are covalent within chain backbone secondary bonds between chains o Polyvinyl Chloride (PVC) H H H H H H | | | | | | – C – C – C – C – C – C – | | | | | | H Cl H Cl H Cl o monomer – molecule that is used to get repeat units PVC H H | | C = C | | H Cl o Polyethylene (PE) In plastic bottles H H | | C = C | | H H o Poly propylene (PP) Found in some bottles H H | | C = C Red box – repeat unit called (mer unit)
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| | H CH 3 Homopolymer – one repeat unit Copolymer – more than one repeat unit which can be placed in any order
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ENGR 240 - 9.26.07 - ENGR 240 Polymers(macromolecules o...

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