2. Bis(4-isocyanatophenyl)methane and ethane-1,2-diol (structures shown below) can be reacted together to form polyureth

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2 Bis 4 Isocyanatophenyl Methane And Ethane 1 2 Diol Structures Shown Below Can Be Reacted Together To Form Polyureth 1 (152.6 KiB) Viewed 9 times

2. Bis(4-isocyanatophenyl)methane and ethane-1,2-diol (structures shown below) can be reacted together to form polyurethane. OCN NCO OH HO bis(4-isocyanatophenyl)methane ethane-1,2-diol (a) Draw the reaction mechanism (including curly arrows etc.) for the initial step in the polymerisation of hexane-1,6-diamine and adipoyl chloride which gives a dimer of the two monomers. [4 marks] (b) What is the degree of polymerisation (DP) at 7%, 33%, 80% and 99.5% monomer conversion for this polymerisation assuming a 1:1 molar ratio of the two monomers? [4 marks] (c) What is the number average molecular weight of the polymer at 99.5% monomer conversion? [2 marks] (d) What is the polydispersity of the polymer at 99.5% monomer conversion? [1 mark]