title: A molecular dynamics investigation of the planar elongational rheology of chemically identical dendrimer-linear polymer blends.
abstract: The structure and rheology of model polymer blends under planar elongational flow have been investigated through nonequilibrium molecular dynamics simulations. The polymeric blends consist of linear polymer chains (187 monomers per chain) and dendrimer polymers of generations g = 1 - 4. The number fraction, x, of the dendrimer species is varied (4%, 8%, and 12%) in the blend melt. We study the effect of extension rate, dendrimer generation, and dendrimer number fraction on pair distribution functions for different blend systems. We also calculate the extension-rate dependent radius of gyration and ratios of the eigenvalues of the gyration tensor to study the elongation-induced deformation of the molecules in the blend. Melt rheological properties including the first and second extensional viscosities are found to fall into the range between those of pure dendrimer and pure linear polymer melts, which are correlated with the mass fraction and generation of the dendrimers in the blend.
authors.affiliation: Department of Mathematics, Faculty of Science, Engineering and Technology, and Centre for Molecular Simulation, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
authors.forename: Elnaz
authors.initials: E
authors.lastname: Hajizadeh
authors.affiliation: Department of Mathematics, Faculty of Science, Engineering and Technology, and Centre for Molecular Simulation, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
authors.forename: B D
authors.initials: BD
authors.lastname: Todd
authors.affiliation: School of Applied Sciences, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia.
authors.forename: P J
authors.initials: PJ
authors.lastname: Daivis