Table 4, the metallocene
samples have lower BDI (narrower branch distribution)
than Ziegler–Natta ones which is due to the
existence of single active site in metallocene catalysts
instead of multiple active sites of Z–N catalysts.
In order to better compare the results, in Fig. 2 the SCB
contents determined by CNMR (or TREF) are plotted against
the results obtained by DSC endotherms for all of Starck’s
samples in addition to ours. As it can be seen, most of the
points fall on the X ¼ Y line which denotes good agreement
between these two methods. The discrepancy in some
points can be attributed to the experimental errors.