Evaluation of molecular linear viscoelastic models for polydisperse H polybutadienes

摘要: Two tube-based molecular models, the hierarchical 3.0 model and branch-on-branch were evaluated for their abilities to predict behavior of a series polydisperse, H-shaped, 1,4-polybutadienes. The samples had been synthesized using novel technique designed suppress generation high molar mass by-products. While size exclusion chromatography data indicated that monodisperse, low by-products later revealed by temperature gradient interaction chromatography. Viscoelastic obtained at temperatures ranging from −75 °C 25 °C, found be thermorheologically simple. Sensitivity uncertainty analyses among parameters, value plateau modulus has strongest effect on predictions. As models improve, it will become ever more essential evaluate them accurate materials whose microstructures have reliably established. This is especially important are structurally polydisperse.