Mala vas 12, SI-1000 Ljubljana, Slovenia
The susceptibility for branching, Si,j, the difference-normalised difference
of data for octanes, ?normi, as well as a number of additional criteria
are used to judge the suitability of 24 physicochemical properties of alkanes
as references for branching. The most appropriate as primary references
for branching regarding these criteria seem to be ?Hf?g, Tc/Pc, and BP/Tc.
They are to be used simultaneously. The following properties, Tc2/Pc, ?,
and C are considered less appropriate. The other tested physicochemical
properties are considered inappropriate measures of branching. From the
data of ?Hf?g, Tc/Pc, and BP/Tc, reference values for branching indices
are constructed, obeying the Methane-based definition as well as for those
indices obeying the n-Alkane-based definition of molecular branching.