Experiment 7 Molecular Basis for Material Properties

Experiment 7 Molecular Basis for Material Properties -...

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Molecular Basis for Material Properties Sidney Sherrill Robert Barrentine October 26, 2010 I certify that this work is my own. Sidney Sherrill
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Data Polymer Swelling Polymer  sample Fluid Initial Final Elapsed time  (min) Dimensions  (mm) Mass  (g)  Dimensions  (mm) Mass  (g) Gummy bear- 1 Water 20×10×10 2.460 23×13×13 3.200 60 Gummy bear- 2 Salt  water 20×10×10 2.270 23×13×13 2.900 60 Gummy bear- 3 Alcohol 20×10×10 2.290 20×10×10 2.253 60 Polymer  bead-1 Water d=2 0.018 d=13 0.538 60 Polymer  bead-2 Salt  water d=2 0.030 d=7 0.150 60 Polymer  bead-3 Alcohol d=2 0.030 d=3 0.026 60 Polymer  sample Fluid Increase Polymer Density Volume  (mL) Mass  (g) Initial  (mL/g) Final  (mL/g) Gummy bear- 1 Water 1.89 0.74 1.23 0.82 Gummy bear- 2 Salt  water 1.89 0.63 1.14 0.75 Gummy bear- 3 Alcohol 0.00 -0.04 1.15 1.13 Polymer bead- 1 Water 1.50 0.52 0.02 2.81 Polymer bead- 2 Salt  water 0.18 0.12 0.14 1.20 Polymer bead- 3 Alcohol 0.01 -0.004 0.14 0.54 Cross-linked Polymers Polymer  Sample  Volume  (mL) Mass  (g) Density (g/ mL) Elasticity Response to Heat Co ld
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Elmer's white  glue and  borax 6 7.3 1.21 10.5/30 Softens,  becomes  more  pliable Ha rd en s,  be co me m or ma lea ble Polyvinyl  alcohol and  borax 7.6 7.72 1.02 30-Nov Melts to  a sticky  goo So lid ifie s Sodium  Silicate and  Ethanol 8 11.73 1.47 21/30 Melts  rapidly Ha rd en s,  be co me les ma lea ble Latex and  acetic acid 5 4.8 0.96 18/30 Nothing  happens So fte ns,  bu no  ot he ch an ge s
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Experiment 7 Molecular Basis for Material Properties -...

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