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- Outline methods for polymer molecular weight determination by dilute solution viscosity measurement.What is meant by isothermal elution?How does temperature programming improve the separation?Comment on the effect of solvent polarity on wavelength max, the equilibrium constant, and deltaH° and deltaS°.
- Discuss the implication for phase stability of the variation of chemical potential with temperature and pressure.An experimental method of determining solubility parameters of polymers involves taking lightly crosslinked (network) samples of the polymers in question and immersing them in different solvents whose solubility parameters are known. Explain the rationale behind this method.Distinguish between TSS and TDS to understand why one is a physical parameter and the other is a chemical parameter.
- Distinguish between number-average and weight-average molar masses. Why might they differ?The volume of gas at 20 °C and 1.00 bar adsorbed on the surface of 1.50 g of a sample of silica at 0 °C was 1.42 cm3 at 56.4 kPa and 2.77 cm3 at 108 kPa. Assume that the Langmuir isotherm applies and estimate the value of V∞.The density of rhombic sulfur is 2.070 g cm-3 and that of monoclinic sulfur is 1.957 g cm-3. Can the application of pressure be expected to make monoclinic sulfur more stable than rhombic sulfur?
- Where is the intermediate formation theory of catalysiis used ?Explain the following approaches to increasing the physical stability (uniformity) of dispersed systems in terms of interfacial behavior: - Wetting of hydrophobic powders -Flocculation with polymers, electrolytes, and surfactantsDiscuss the implications for phase stability of the variation of chemical potential with temperature and pressure.
