O'Toole, Jim Corliss H.S.

Objectives: The students will gain an understanding of what polymers are. Define MONOMER " POLYMER List 10 examples of polymers found in your home The students will gain an understanding of how monomers are combined to form polymers. Define ADDITION POLYMERIZATION " CONDENSATION POLYMERIZATION The students will gain an understanding of polymer strength. Define CROSSLINKING " CRYSTALLINITY Apparatus Needed: Materials: hexamethylene diamine; sodium hydroxide; adipyl chloride; carbon tetrachloride; wood sticks; plastic gloves; safety glasses; common examples of polymers; child type construction blocks; Prepare two solutions: (1) 2.32 grams of hexamethylene diamine and 1.6 grams of sodium hydroxide in about 100ml of water. (2) 3.66 grams of adipyl chloride in about 100ml of carbon tetrachloride. Recommended Strategy: Place adipyl chloride solution at bottom of clean beaker; carefully pour aqueous layer over this without stirring or mixing; try to avoid splashing. With a stick remove the film which forms between the two layers. Continue to remove the film as it is formed. When you have pulled out a nylon fiber of sufficient length, wash it in clean water to remove excess reagents. [Morgan + Kwolek, J. Chem. Educ. 36 182-184 April 59] After about 15 min. or when each student has had a turn, then you will want to explain the PHENOMENA. Be sure to integrate your household polymer hardware (child type building blocks, common household things made of polymers, etc...) in a logistically systematized program that will concretize your explanation of the PHENOMENA.
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