1430 callister rethwisch 3e fig 1430 is from fw

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Unformatted text preview: Jon (step) polymerizaJon AddiJon (Chain) PolymerizaJon –  Ini@a@on –  Propaga@on –  Termina@on AddiJon (Chain) PolymerizaJon Ini@a@on Propaga@on Termima@on www.youtube.com/watch?v=RzMNOqzmYas CondensaJon (Step) polymerizaJon CondensaJon (Step) polymerizaJon www.youtube.com/watch?v=uA4TeSEWTxI Polymer addiJves Improve mechanical properJes, processability, durability, etc. •  Fillers •  Stabilizers •  PlasJcizers •  Lubricants •  Colorants •  Flame Retardants Processing PlasJcs •  Thermoplas@c •  can be reversibly cooled & reheated, i.e. recycled •  heat unJl soB, shape as desired, then cool •  ex: polyethylene, polypropylene, polystyrene, PMMA Processing PlasJcs Thermoplas@c www.youtube.com/watch?v=5dXMGDRWpqg Processing PlasJcs •  Thermoset •  when heated forms a molecular network (chemical reacJon) •  degrades (doesn’t melt) when heated •  a pre- polymer molded into desired shape, then chemical reacJon occurs •  ex: urethane, epoxy Processing PlasJcs Thermoset www.youtube.com/watch?v=- cyTDZmkbYc Processing PlasJcs: Compression Molding Thermoplas@cs and th...
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