Add time:09/01/2019         Source:sciencedirect.com

This article reviews the controversy between the two methods by which polymer names and structures are stored in databases and presented by authors in publications such as books, encyclopedias, and journals. The two methods, known as source-based representation and structure-based representation, require different approaches from the point of view of both how the structure of a polymer is represented, and in what style its name is written. The problem of mismatches between name and structure representation styles is addressed, and guidance is offered with regard to correct orientation of structural repeating units (SRUs). The need for improved graphical representation and naming of structural repeating units is stressed, and directions are given for obtaining the rules for identification, orientation, and naming of SRUs. Polymer representations, and their accompanying nomenclature, are divided in this article into three main categories. Category A discusses linear polymers for which Chemical s Service (CAS) has class assignments such as amine resin, polyamide, and polyether. Category B discusses linear polymers with special features—examples are alternating and periodic copolymers, block copolymers, inorganic and coordination polymers, and modified/post-treated polymers. CAS has no special class assignment for these features per se. Category C discusses non-linear polymers such as comb/graft polymers, cross-linked polymers, and dendritic/hyperconnected/star polymers.

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