1. The molecular structures of three common monomers that can be polymerised ionically are given below. N 1,3-butadiene

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1 The Molecular Structures Of Three Common Monomers That Can Be Polymerised Ionically Are Given Below N 1 3 Butadiene 1 (184.28 KiB) Viewed 7 times

1. The molecular structures of three common monomers that can be polymerised ionically are given below. N 1,3-butadiene acrylonitrile methyl vinyl ether (a) One of these monomers can be polymerised using a cationic initiator (1+), one using an anionic initiator (1) and one can be polymerised using either a cationic or anionic initiator (i+ or 1-). Identify which monomer is polymerised using which initiator (s). [3 marks] (b) Draw the reaction mechanisms (including curly arrows) of the first step in the polymerisation process initiation) for all three monomers. There is no need to give the structure of the initiators (i.e. It, I may be used). [6 marks] (c) With reference to the reaction mechanisms and structures you have given in your answer for part (b) justify your reasoning for the answers you gave in part (a). [6 marks] (d) Assuming the molar ratio of initiator to monomer in a polymerisation of acrylonitrile was 1:750 calculate the number weight average of polyacrylonitrile at 70% monomer conversion. Please show your workings. [3 marks]