Study On The Relationship Between Rheological Characterization And Mechanical Properties Of Nylon1212/PE-g-MAH Blends

Because of its excellent properties, nylon is widely used in many fileds. But itneeds toughening to meet the requirement of a higher demand for its toughness forsome special product. Usually, Scholars prepared super-toughness material byreactive blending of nylon and functional polyolefin. However, in order to get thesuper-tough formula, it is relatively complicated to carry out a large number ofexperiments based on orthogonal design method. Aimed at studying the relationshipbetween rheological characterization and mechanical properties of nylon1212/functional polyethylene blends to explore a simple and rapid and effectivemethod for the preparation of super-toughness material, this study have prepared twokinds of nylon1212/polyethylene blends by reactive blending,nylon1212/LLDPE-g-MAH and nylon1212/HDPE-g-MAH, and investigated theirmechanical properties, rheological behavior and microstructure. The main results areas follows:(1) Compared with the pure nylon1212, the impact strength of bothnylon1212/LLDPE-g-MAH and nylon1212/HDPE-g-MAH increased significantlywith the maximum impact strength up to106kJ/m2by almost8.2times.(2) The storage modulus G’ curve of nylon1212/polyethylene blends showed a“second plateau” in the low frequency region, indicating that the blends occurredliquid-solid transition.(3) Both of the blends had a “gel point” in the test range, and the blends of nylon1212/LLDPE-g-MAH corresponding to gel point had the maximum impact strength,while the impact strength of nylon1212/HDPE-g-MAH corresponding to gel pointwas significantly greater than the near point. The morphology of the blends at gelpoint showed special "network-like" structure. All of above indicated thecorresponding relationship between rheological characterization and mechanicalproperties of blends.