Ultra-high molecular weight polyethylene (UHMWPE)

linear low density polyethylene (LLDPE) and polyethylene wax (PE-wax) were used to prepare UHMWPE /LLDPE and UHMWPE /PE-wax blends with relatively low UHMWPE concentrations. The influence of different concentrations of UHMWPE on the formed structure of UHMWPE chain entanglement in two blends

especially the critical concentration of onset of entanglement

was investigated by applying small oscillatory shear rheology and scanning electron microscope. The compatibility of UHMWPE/LLDPE blends was good according to rheological tests. It is suggested that when the concentration of UHMWPE in UHMWPE/LLDPE blends is higher than 1. 68%(wt)

the blends perform as solid gel independent of frequency at region of low frequency in frequency sweep curves

at the same time

the storage modulus begins to increase in time sweep curves. And with PE wax as a lower molecular weight matrix

the storage modulus of UHMWPE/PE-wax blends increase significantly

when the concentration of UHMWPE in UHMWPE/PE-wax blends is higher than 0. 84% (wt). Furthermore

the emergence of filaments in images of brittle fracture surface of UHMWPE/PE-wax blends coincidently begins at the concentration of 0.84% (wt). In conclusion

UHMWPE forms entanglement structure in the blends with UHMWPE concentrations above a critical value of c = 0. 84% (wt)

four times the critical overlap concentration.