What do we know about C28H14 and C30H14 benzenoid hydrocarbons and their evolution to related polymer strips?

While critically reviewing the current status of what is known about C(28)H(14) and C(30)H(14) benzenoid isomers, which are ubiquitous pyrolytic constituents, some new insights will be presented. Representative isomers belonging to these benzenoid hydrocarbons are at the crossroads to homologous series that extend to infinite polymer strips that have been the object of numerous molecular modeling studies. The goal of these studies is to understand their potential electronic properties for material science applications. Along the way, some prior numerical results are supplemented.