Table 1.

Physical characteristics of mega HPGs.

Entry	Polymer	Mw (Da)	Đ	DOB	Size (nm)	[ƞ] (mL/g)
1	Mega HPG-1	1.3 × 106	1.2	0.57	21.2 ± 0.4	4.67
2	Mega HPG-2	2.9 × 106	1.2	0.54	30.6 ± 0.6	5.26
3	Mega HPG-3	9.3 × 106	1.4	0.53	43.0 ± 0.4	6.15

Absolute molecular weight (M_w) and distribution (Đ) of mega HPGs was confirmed by size-exclusion chromatography coupled with light scattering detector (MALS). Degree of branching (DOB—53-57%) supports the semidendritic nature of the polymers and it was determined by ¹³C IG NMR spectroscopy. Mega HPGs are compact in size and have low intrinsic viscosity [ƞ], determined by quasielastic light scattering (QELS) detector and viscometer-II detector, respectively, which are coupled to a gel permeation chromatography system.