Determination of the molecular weight distribution of entangled linear polymers from linear viscoelasticity data

摘要: In a companion paper [Macromolecules 35 (2002) 2689], we have addressed the direct problem of predicting linear viscoelastic response entangled polymers from their molecular weight distribution, using suitable model inspired by reptation theory. By comparing theoretical results to experimental data for variety samples different nature (polystyrene, polycarbonate, high-density polyethylene) and distribution (monomodal multimodal), found that time-dependent diffusion proposed des Cloizeaux, suitably modified treat short chains include Rouse processes, is capable quantitative predictions. present paper, use Cloizeaux address inverse dynamic moduli. A parametric approach implemented deal with ill-posedness problem. Results are given most studied in 2689]. They agreement size-exclusion chromatography data. particular, methodology able resolve small amounts bimodal blends containing large long chains. (C) 2002 Elsevier Science B.V. All rights reserved.