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Problem 1: Discuss the length alternation of carbon-carbon bonds in trans- polyacetylene. Compare this phenomenon with the bond lengths in benzene and grapheme. Problem 2: List the similarities and differences between the doping of silicon and the doping of a conjugated polymer. Problem 3: Draw the chemical structure of poly(1,4-phenylene vinylene) doped with sulfuric acid (one HSO4° dopant for every two phenylenevinylene repeating units). Based on the measured gravitational density of 1.4 grams/cm³ and electrical conductivity of 2.7 X 104 S/cm, 1. Calculate the doped polymer's macroscopic carrier mobility 2. How would you fabricate a conductive thin film based on this polymer. Problem 4: Elaborate a method to turn a polyester clothing antistatic and thus more comfortable to wear. Problem 5: Draw the chemical structure of emeraldine base. Describe two approaches to process conducting polymer fibers based on emeraldine base. Problem 6: Based on your knowledge about the electrochemical redox of polypyirole, predict the general features of the cyclic voltamogram of PPy doped with poly(styrene sulfonate) in an aqueous solution of poly(styrene sulfonate tetraethylammonium, PSS Et4N*). Problem 7: Devise a smart window that can be reversibly switched between dark (absorbing blue and green portion of the sun light) and light blue (sky blue). Problem 8: Devise a bimorph actuator based on two conducting polymers such that the bimorph exhibits linear motion (expand/contract in length). Problem 9: Water soluble conjugated polymers are being studied for biosensing. What are the structural characteristics of such polymers? Explain why they may be superior to laser dyes (fluorescent organic small molecules). Problem10: Use the data from Lecture 5A, slide 3, calculate the transmittance of polyaniline with a surface resistance of 100 ohm/square. Problem11 Structure-property relationship is critically important in materials science. Discuss four (4) structural aspects of conjugated polymers and how they may affect the property of the polymer. Give one example for each structure-property relationship. Problem 12 Compare Shirakawa polyacetylene and poly(1-(p- butylphenyl)-2-phenylacetylene) with regard to (1) thin film fabrication, (2) band gap, (3) conductivity of doped polymers, and (4) fluorescence. Justify your answers. Problem 13 Compared to poly(2-hexyl-1,4-phenylene), poly(9,9-dihexylfluorene-2,7- diyl) has higher molecular weight and smaller bandgap. Explain the differences. Problem 14 MEH-PPV is an orange light emitting polymer invented by Professor Fred Wudl. It is widely used for polymer LEDs and solar cells. Describe how this polymer is synthesized and how conjugation defects may be formed in the synthesis. Problem 5What is solvatochromism? Would you expect solvatochromism observed from the two substituted polythiophenes shown to the right? Do they behave similarly or differently?

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