In the present work

the relationship between sol fraction (s) and radiation dose (R) in radiation crosslinking of PP/HDPE blends was studied. The results indicate that both Charles-by-pinner expression and Chen-Liu-Tang expression

which were well applicable with radiation crosslinking of some polymers

do not well fit to the case of PP/HDPE blends.According to Zhang's assumption

which deals with relationship between structure and radiation crosslinking of pure polymers and applies to most cases

fracture density of polymer is proportional to Rβ

where β is a parameter depending on the structure of a polymer.In this paper

we extended their assumption to polymer blends

but the Rβ value of blends were modified by equation Rβ=∑fiRβi

where fi and βi are weight fraction and β value of i component in blend

respectively. Using the modified Rβ

good linear relation between R(s+s)and Rβ of PP/HDPE blends was obtained.