For polymerization of styrene in tetrahydrofuran at 25°C using sodium naphthalide initiator, the rate coefficient for propagation is 550 dm^3 mol^-1 s^-1. If the initial mass concentration of styrene is 156 g dm^-3 and that of sodium naphthalide is 3.02x10^-2 g dm^-3, calculate the initial rate of polymerization and, for complete converison of the styrene, the number-average molar mass of polystyrene formed. Comment upon the expected value of molar mass dispersity (Mw/Mn) and the stereoregularity of the polystyrene produced.
Assume: Process is anionic polymerization, Styrene MW=104g/mol, Sodium Naphthalide MW=151g/mol, and initiation occurs by dissociation mechanism
For polymerization of styrene in tetrahydrofuran at 25°C using sodium naphthalide initiator, the rate coefficient for...
Polystyrene can be polymerized from the starting monomer (styrene) pictured below. a. Anionic polymerization is one method of polymerization that can be used to generate polystyrene from styrene. Explain what type of initiator should be used for this reaction and draw an example of a styrene monomer that has reacted with initiator. b. Using this anionic polymerization method and a starting concentration of 1M styrene and 1mM initiator, what degree of polymerization (Xn) would you expect if you use up...
Q3 (25 pts) The polymerization is done by the anionic mechanism, and 2 mol of polystyrene is polymerized in tetrahydrofuran (THF). Polymerization was initiated by 1.5 x 10-3 mol of sec- Buli. a) What is the expected number average chain length? (5 pts) b) What is the expected number average chain length if the efficiency of the initiator is 80%? (10 pts) c) At 75% conversion, 0.5 x 10-3 mol of water is added and the reaction continues. What is...