Emergence of chain entanglement of UHMWPE(Ultra-high molecular weight polyethylene)in dilute solution conditions was studied using the following blending systems:(1)PEwax(considered as a solvent and eliminating entanglements of the matrix)having the molecular weight slight less than the entanglement molecular weight M e(=4ρRT/5GN),and(2)that of UHMWPE being far more than M e.The molecular dynamics and micro-structure of the blends was investigated via a combination of rheological measurement and microscopical observation.The rheological and morphological studies revealed that emergence of chain entanglement of UHMWPE appears when the weight fraction of UH,W2,becomes higher than 0.84wt%(four times of the critical overlapconcentration).Enhanced storage modulus at low frequencies was observed in the blends compared with the properties of the bare PE wax.Because of the shear process,the blends were structurally heterogeneous,and anumber of UH chains move in a larger scale as “thread” shaped bundles(about 100 nanometers in diameter)in a matrix of PE wax.Meanwhile,the system experiences a process from a heterogeneous state in distribution of chain and entanglement to a thermodynamic equilibrium state during oscillatory shear tests.