Natural SciencesMaterials EngineeringMaterials SciencePolymer ChemistryPolymer MaterialsRheologyMelt RheologyPolymer Chain ConformationPolymer MorphologyPolymer PhysicsPolymer RheologyBranch PointsBranching Effects On Molecular Weight DistributionCopolymer Molecular Weight DistributionElongational FlowMolecular Weight DependenceMolecular Weight Dependence Of Polymer PropertiesRheology Of Polymer BlendsViscosity
Elongational data on a large number of polyethy lene sam pies with different structures and their blends are presented in order to evaluate the influence of the molecular weight and molecular weight distribution for a given degree of long chain branching. The elongational viscosity rises with the number of branch points and also with molecular weight and molecular weight distribution. Simple relation ships between elongational viscosity at a given deformation and molecular parameters are presented.