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CHM 5511 Practice Mid-Term Exam

CHM 5511 Practice Mid-Term Exam - Use pictures showing...

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CHM 5511 – Physical Chemistry of Polymers Practice Mid-Term Exam Spring 2010 1. Describe two experimental methods that were used to resolve the controversy that polymers were truly covalently bonded macromolecules and how the results obtained were important towards that resolution. 2. Consider the polymerization of 13.6 grams of pentaerythritol with 36.6 grams of adipoyl chloride. Determine the average functionality (f av ) for this mixture and determine the extent of conversion at the gel point. 3. Give the equation for the mean-squared end-to-end distance for a chain using the Hindered Rotation Model, then identify and explain each variable.
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Unformatted text preview: Use pictures showing angles to make your answer clear. 4. Using group contributions, calculate the solubility parameters of poly(vinyl chloride) and poly( ε-caprolactone). a. Given that the solubility parameter difference between two polymers has to be very small [≈ (0.1 cal. cm-3 ) 0.5 ] for polymers to mix, would you expect these two polymers to form a miscible amorphous blend? b. If your answer to 4a. is no, and you were told these two polymers did form an miscible blend, why might that be? 5. What is the difference between a thermoplastic and a thermoset? Use model structures to elucidate the differences....
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