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Processing of Linear Low Density Polyethylene

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Time of issue:2022-10-04 14:03
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(Summary description)Both LDPE and LLDPE have excellent rheology or melt flow. LLDPE has less shear sensitivity because of its narrow molecular weight distribution and short chain branches.

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Processing of Linear Low Density Polyethylene

(Summary description)Both LDPE and LLDPE have excellent rheology or melt flow. LLDPE has less shear sensitivity because of its narrow molecular weight distribution and short chain branches.

Categories:Linear low density News
Author:
Origin:
Time of issue:2022-10-04 14:03
Views:

Information

Both LDPE and LLDPE have excellent rheology or melt flow. LLDPE has less shear sensitivity because of its narrow molecular weight distribution and short chain branches. LLDPE retains a greater viscosity during shearing and is therefore more difficult to process than LDPE of the same melt index. In extrusion, the lower shear sensitivity of LLDPE results in faster stress relaxation of the polymer molecular chains and thus less sensitivity of physical properties to changes in blow-up ratio. In melt extension, LLDPE generally has lower viscosity at various strain rates. That is, it will not strain harden when stretched like LDPE.

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As the deformation rate of polyethylene increases, LDPE shows a surprising increase in viscosity, which is caused by molecular chain entanglement. This phenomenon is not observed in LLDPE because the lack of long chain branches in LLDPE keeps the polymer free from entanglement. This property is extremely important for thin film applications. LLDPE films are easier to make thinner films while maintaining high strength and toughness.

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