chm325h-m2010 - UNIVERSITY OF TORONTO Faculty Of Arts and...

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Unformatted text preview: UNIVERSITY OF TORONTO Faculty Of Arts and Science FINAL EXAMINATION 13TH APRIL 2010 CHEM 3255, DURATION: 120 MINUTES, TOTAL MARKS: 120 NO AIDS ALLOWED NOTE THAT CLEAR DIAGRAMS AND CONCISE INFORMATIVE ANSWERS ARE ESSENTIAL FOR SCORING HIGH MARKS IN THIS EXAMINATION ANSWER SECTIONS A AND B IN SEPARATE EXAMINATION BOOKLETS MARKS FOR EACH QUESTION ARE PROPORTIONAL TO THE TIME IN MINUTES THAT YOU SHOULD ALLOCATE FOR ANSWERING EACH QUESTION 10f3 SECTION A 1. (20 marks) Explain how lR-spectroscopy can be used to characterize (a) the presence of a crystalline component in a polymer; (b) the presence of hydrogen bonds in a polymer; (0) the onset of polymer degradation by oxidation 2. (20 marks) Semi-crystalline polymers often have a high melting temperature, Tm, and hence require a high processing temperature. Use a polymer of your choice and discuss 3 modifications that would to lower its melting temperature. For each method, explain the reason for reduction of Tm and give appropriate equation(s) where possible. 3. (20 marks) Explain how you would synthesize (a) monodispersed poly(butyl methacrylate) particles with a mean diameter of 500 nm (b) polystyrene with PD|=1.1. (c) poly(ethylene terephtalate) For (a) describe the polymerization process; (b) and (c) write the polymerization reactions 20f3 SECTION B 1 (60 MARKS) Within the framework of electronic band theory there exist a cornucopia of solid state materials built of atomic lattices like Na, Ag, Pt and Si, GaAs, CdSe that behave as conventional metals and semiconductors, respectively. There also exist a profusion of solid state materials that in stark contrast are built of regular arrays of coordination and organometallic compounds, organic and inorganic molecules and polymers that can also exhibit the properties of metals and semiconductors but with a number of unconventional properties. Choose THREE examples from the materials listed below and where possible elaborate on key relations between their synthesis and structure, bonding and chemical reactivity, electrical and optical properties that enable them to be classified as a conventional or unconventional metal or semiconductor or both. And with this knowledge explain for TWO of the chosen examples how these properties evoke a particular function and how this function could make them eminently suitable for a specific application. {(MPC)O}n K2Pt(CN)4°3H20 V02_XFX PDMFS (CHln (SNln (TMTSF)2C|O4 PP (TTF)(TCNQ) 599°N9‘WPSNNE" where M = Si or Ge or Sn, Pc = phthalocyanine, PDMFS = polydimethylferrocenylsilane, (CH)n = polyacetylene, (SN)n = polythiazyl, TMTSF = tetramethyltetraselenofulvalene, PP = polypyrrole, TTF = tetrathiafulvalene TCNQ = tetracyanoquinodimethane, — End of Exam - 3of3 ...
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