Macromolecule, tactic

Tactic macromolecule, essentially comprising only one species of configurational base unit, which has chiral or prochiral atoms in the main chain in a unique arrangement with respect to its adjacent constitutional units. 

Note Analogous formulae can be drawn for other tactic macromolecules [3]. 

Tacticity - The orderliness of the succession of configurational repeating units of a macromolecule or oligomer molecule. In a tactic macromolecule essentially all the configurational repeating units are identical with respect to directional sense. See Configurational repeating unit, Isotactic, Syndiotactic. [8]... 

Fritz D, Harmandaris VA, Kremer K, van der Vegt NFA (2009) Coarse-grained polymer melts based on isolated atomistic chains simulation of polystyrene of different tacticities. Macromolecules 42 7579-7588... 

All these observations suggest that tactic macromolecules of the above type are substantially, even sometime not formally, achiral and their symmetry properties are better represented by the infinite length chain. Thus in order to prepare macromolecules capable of displaying stable and appreciable chiro-optical properties in all conditions, the symmetry elements rendering the infinite chain model achiral must be eliminated. 

Note 2 A tactic macromolecule is a regular macromolecule, in which essentially all the eonfig-uralional repeating units are identical [1.2],... 

Miura Y, Satoh T, Narumi A, Nishizawa O, Okamoto Y, Kakuchi T. Atom transfer radical polymerization of methyl methacrylate in fluoroalcohol simifltaneous control of molecular weight and tacticity. Macromolecules. 2005 38 1041-1043. 

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