LLDPE Matetials

Both LDPE and LLDPE Matetials have excellent rheological or melt flow properties.LLDPE has less shear because it has a narrow volume distribution and short branched chains. In shear (e.g., extrusion), LLDPE maintains a greater viscosity and is therefore more difficult to process than LDPE with the same melt index. In extrusion, the lower shear of LLDPE results in faster stress relaxation of the polymer chains and the resulting reduced susceptibility of the substance to changes in blow-up ratio In melt extension, LLDPE Matetials generally have a lower viscosity at all strain rates. This means that it will not strain harden in tension as much as LDPE. As the rate of deformation of the polyethylene increases. the LDPE shows a surprising increase in viscosity which is caused by chain entanglement. This phenomenon is not observed in LLDPE, where the lack of long branched chains makes the polymer non-tangle. This property is extremely important for film applications. This is because LLDPE films are easy to make thinner films while maintaining high strength and toughness.

Production & Characterization