Flory convention explained

In polymer science, the Flory convention is a convention for labelling rotational isomers of polymers. It is named after nobel prize-winning Paul Flory.^{[1] [2]}

The convention states that for a given bond, when the dihedral angle formed between the previous and subsequent bonds projected on the plane normal to the bond is 0 degrees, the state is labelled as "trans", and when the angle is 180 degrees, the angle is labelled as "cis".

Notes and References

1. Flory PJ . Molecular Size Distribution in Three-Dimensional Polymers: I, Gelation . J. Am. Chem. Soc. . 63 . 11 . 3083 . 1941 . 10.1021/ja01856a061.
2. Morris PJT (1986). "Polymer Pioneers: A Popular History of the Science and Technology of Large Molecules". Center for History of Chemistry, Philadelphia.