This project is intended as a complement to the project 2013-031-3-800, ‘Structure-based nomenclature for irregular linear, star, comb and brush polymers’, which provides guidelines for the nomenclature of linear and branched polymers with three or more blocks that are of identical constitutional repeating units (CRU). This new project will provide guidelines for the nomenclature of the same type of polymers but, importantly, it will extend the nomenclature so that polymers containing more than one type of CRU can be easily and uniquely described.
In research and in industry, there is a need for clear guidelines for the nomenclature of such materials, both for articles and patents. On the one hand, recent developments in “controlled” polymer chemistry allow for greater control over polymer structures, and on the other hand, an increasing market demand for more complex materials, have together meant that polymeric structures are more complex and better defined. The current IUPAC recommendations can deal with most structures, but are increasingly becoming outdated, and in some cases, surpassed by the complexity of recently reported polymer skeletons. Source-based nomenclature has recently undergone a massive update. It can deal with most common structures; however, it suffers from its intrinsic incapability to deliver absolutely unique names for unique structures. This project will deliver recommendations for structure-based nomenclature which will be able to uniquely identify polymers and copolymers which contain a multiple number of CRUs in complex linear, star, comb and brush-based structures.
In 2013 project “Structure-based nomenclature for irregular linear, star, comb and brush polymers” was approved by IUPAC. In that project, new nomenclature guidelines are proposed for four types of structure-based represented polymers, which contain identical constitutional repeating units (CRU) all connected in the same way with respect to a central moiety.
The first type of polymer is a linear, single-strand with two blocks of identical CRUs, depicted generically as EG1-[CRU]n-J-[CRU]n-EG2, where EG is end-group and J is a central non-repeating junction unit.
The second type of polymer is a linear, single-strand with more than two blocks of identical CRUs. It can be represented for example as EG1-[CRU]n-J-[CRU]n-J-[CRU]n-EG2.
The third type of polymer is a star type with three or more identical blocks of CRUs connected to a central non-repeating junction unit.
The fourth type of polymer is a multi-branched (comb-like) type with a backbone comprising several subunits, of which only one has a connectivity of three.
Following completion of that initial project, the nomenclature for four types of structure-based polymer representations with more than one type of CRU is to be addressed next.
Project announcement published in Chem Int April 2020, p. 28
August 2020 update – A provisional recommendations titled “STRUCTURE-BASED NOMENCLATURE FOR IRREGULAR LINEAR, STAR, COMB AND BRUSH POLYMERS” is available for comments till 31 Dec 2020 > see https://iupac.org/recommendation/structure-based-nomenclature-for-irregular-linear-star-comb-and-brush-polymers/.
Page last update 18 Aug 2020