https://phys.org/news/2018-06-id-pictures-polymers-abba-fan.html

Conjugated polymers are able to conduct electricity because they are a chain of conjugated molecules where electrons can move freely due to their overlapping electron p-orbitals. Effectively, they are excellent molecular wires. Moreover, they are akin to semiconductor materials (they have energy gaps), so they can be used for electronic (plastic electronics) and photovoltaic (organic solar cells) applications.

Modern functional polymers are often co-polymers, that is, they are made by an (ideally regular) sequence of different monomers. The order of these monomers is essential to their opto-electronic properties which can be severally damaged by errors in how the monomers actually link up in a chain to form the polymer (so called polymerisation errors occurring during the synthesis of these materials). However, detecting the nature and exact position of these errors has proved problematic with current analytical methods. Mass spectrometry does not provide a solution, as shorter polymer chains are typically more likely to be ionised and thus tend to be overrepresented in the spectra.