Block copolymers are of interest due to their ability to undergo microphase separation. Originally block copolymers were produced with a low polydispersity index (PDI) as they were made primarily through anionic polymerisation, which is a demanding and laborious technique. The recent development of controlled radical techniques such as atom transfer radical polymerisation (ATRP) and radical addition fragmentation chain transfer polymerisation (RAFT) opens up the possibility that production of a wide range of block copolymers will become economically viable in the future. ATRP and RAFT produced polymers have higher PDIs than their anionic counterparts. We will use deuterium labelling to study how these difference chain lengths locate themselves in the different morphologies present in block copolymers.