CH10continued- feb 20

CH10continued- feb 20 -...

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Ch. 10 Polymers continued CHE 1405 Tiffany_Turner@baylor.edu http://bearspace.baylor.edu/Tiffany_Turner/public
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Review: How to make a polymer Strength, durability, resistant to large temperature changes Addition polymerization (chain-growth) Small units are joined together every atom in the monomer(s) is(are) retained in the polymer Condensation polymerization (step-growth) units are combined and a small molecule is removed (H 2 O, NH 3 , HCl) How to make polymers stronger Crosslinking- joining polymer chains side to side • Adds strength to the polymer Vulcanization- heating rubber with Sulfur to create crosslinks
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Review: Temperature and polymers Thermoplastic- polymers that can be heated and remolded Ex. Poly(methyl methacrylate) PMMA = Plexiglas Thermosetting- cannot be remolded with heat Heat destroys the polymer Ex. epoxy Properties of polymers Crystalline- make great fibers Amorphous- random orientation Elastomers (rubber bands)
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This note was uploaded on 04/30/2008 for the course CHE 1405 taught by Professor Dworkin during the Spring '08 term at Baylor.

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CH10continued- feb 20 -...

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