The "half-monomer" concept for sequence analysis of condensation copolymers by NMR

The "half-monomer" concept was introduced in 1982 by Devaux et al.. The authors used Nuclear Magnetic Resonance (NMR) to characterize the copolymer obtained when mixing and heating at 290¼C poly(butylene terephthalate) (PBT for brief) together with poly(bisphenol A carbonate) (PC for brief). They noted that the repeat unit of PBT and of PC can be ideally split in two parts and thus they introduced four half-monomers A, B, C, D namely .