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Experiment 9 Molecular Basis for Material Properties MaryFrances Johnson Alan Bussoletti March 27, 2018 CHEM 1310 Section C27 TA: Shaoren Yuan Honor Pledge – Freshman Chemistry Lab I did not copy any portion of this work from the work of other students, old lab reports, or unreferenced materials. I understand that such activity is a violation of the Georgia Tech Honor Code.
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Data and Results A. Polymer Swelling Table 1. Swelling of Different Polymers in Various Solvents Sample + Solvent Initial dimensions (mm) Initial mass (g) Final dimensions (mm) Final mass (g) Elapsed time (min) Gummy bear + water 19.0 2.330 21.3 2.468 55 10.5 10.7 10.1 11.2 Gummy bear + salt water 18.8 2.439 19.2 2.386 55 10.7 10.7 10.9 11.2 Gummy bear + alcohol 19.4 2.359 20.0 2.336 55 9.7 10.8 11.1 11.8 Polymer bead + water 2.8 0.022 10.0 0.415 55 2.8 10.0 2.8 10.0 Polymer bead + salt water 3.5 0.036 6.1 0.151 55 3.5 6.1 3.5 6.1 Polymer bead + alcohol 2.4 0.023 3.2 0.028 55 2.4 3.2 2.4 3.2
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Table 2. Changes in Volume and Density Upon Swelling Sample + Solvent Initial volume (ml) Final volume (ml) Initial density (g/ml) Final density (g/ml) Gummy bear + water 2.014 2.553 1.157 0.967 Gummy bear + salt water 2.193 2.300 0.899 0.964 Gummy bear + alcohol 2.089 2.549 1.129 1.091 Polymer bead + water 0.012 0.524 1.833 0.791 Polymer bead + salt water 0.022 0.119 1.636 1.269 Polymer bead + alcohol 0.007 0.017 3.286 1.647 B. Cross-linking Polymers Observations of Cross-linked Polymers Elmer’s white glue and borax polymer formed into a chunky, white looking substance Sodium silicate combined with ethanol looked like a smooth ball of ice, cloudy translucency, very hard to form into a ball Latex and acetic acid appeared like a rubber ball but less smooth, yellow/tan in color, smelled like bad rubber
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