CHEMENG 4B03 Lecture Notes - Batch Reactor, Dispersity, Styrene
22 Nov 2012
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1, frp: consider a free-radical polymerization carried out isothermally in a batch reactor with bimolecular termination chemically-controlled. The polymerization temperature is higher than the glass-transition temperature of the polymer being synthesized. L/mol sec, ktd = 2x108 l/mol sec, and monomer molecular weight: 100 g/mol. Calculate the instantaneous number- and weight-averages (mn and mw) at the start of the polymerization (at zero monomer conversion). 2, lap: 60 kg styrene (density: 0. 98 kg/l) was initiated by 0. 25 kg sodium naphthalene in. Calculte the polymerization rate when mma was just added and the final molecular weight of the st/mma copolymer product. 3, cationic polymerization: 5 kg polyisobutene sample was prepared in toluene with bf3/h2o system. Explain why the termination rate between polymer radicals is not zero but has this dependence on propagation rate and no dependence on polymer radical chain length. If the bf3 level is to be doubled in the next batch, what time required to have 99%.
