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412_Fall2011_CS_7 - Case Study/Lab CHEM 4:012 Topic 7 Case...

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Case Study/Lab 8/21/2011 CHEM 4:012 FALL 2011 1 CHEM 4:012 Topic 7 Case Study Polymers: Synthesis & Properties Case Study Activity ° Two major problems with the polymer products produced by UI chemistry undergraduates in Fall 2010: ° Problem 1: HI-owa bouncers do not bounce enough. ° Problem 2: IC-goo is often not “gooey” enough. ° Your goal: - understand how these products work - create new and improved material Chemical and Technical background ° The ability to tune the properties of matter by varying the structure of the molecules of which it is composed is a fundamental part of the chemistry. ° In lab, you will systematically synthesize several polymeric materials and measure their properties. ° You will experimentally define relationships between structures and physical properties.
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Case Study/Lab 8/21/2011 CHEM 4:012 FALL 2011 2 Measurements of the Properties of Polymers Various syntheses of polymers with chemical compositions that differ slightly Polymer properties Applications involving polymers Take Notes ° How do you make IC-Goo? ± What is the problem? ± What physical property should you vary/measure? ± How should you set up your experiment? ± What do you expect to find? ° How do you make a HI-owa Bouncer? ± What physical property should you measure? ± How should you set up your experiment? ± What do you expect to find? ° Molecules of large molecular mass formed by sequentially bonding many smaller repeating units ( monomers ) ° Two categories of mechanisms form polymers: addition and condensation. ° Two major polymer categories: synthetic and biological . Polymers nM –M–M–M–M–M–M– or n M + n M –M– M –M– M –M– M
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Case Study/Lab 8/21/2011 CHEM 4:012 FALL 2011 3 ° Monomers react to form a polymer chain without net loss of atoms °
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