Compatibility of very low density polyethylene (VLDPE) with other commercial polyethylenes is studied by DSC

WAXD and SAXS. HDPE/VLDPE blends are compatible through cocrystallization. Copious amorphous part in VLDPE `dissolves' the crystallite defects of HDPE

improving the latter's Tc

Tm and Xc. Half width of HDPE's WAXD crystallite peaks becomes narrower

and unitcell parameters show minimum values with composition. VLDPE and LLDPE are similar in structure

and they are cocrystalline compatible.Mutual interaction between LDPE/VLDPE is evidenced by the increase in unit-cell parameters and crystallite dimension

the appearance of two individual Tm's

and the constantly higher Tc

Tm values of VLDPE and lower Tc

Tm of LDPE than expected of their composition.This is due to the continuous filling of LDPE into VLDPE occupying the space

forming separate incompatible system.