title: Determination of low amounts of long-chain branches in polypropylene using a combination of chromatographic and rheological methods.
abstract: The focus of our investigations lies on the detection of low amounts of long-chain branching (LCB) in isotactic polypropylene (iPP) created by electron beam irradiation. The modified samples were investigated by rheological experiments in shear and elongational flow and by size-exclusion chromatography. The comparison of the results demonstrates the efficiency and the detection limits of these methods, particularly at very low degrees of long-chain branching. The combination of chromatographic and rheological methods enables a sensitive and comprehensive way for the characterisation of the long-chain branching phenomena.
authors.affiliation: Leibniz-Institute of Polymer Research Dresden, Hohe Strasse 6, Dresden 01069, Germany. krause-beate@ipfdd.de
authors.forename: Beate
authors.initials: B
authors.lastname: Krause
authors.forename: Dieter
authors.initials: D
authors.lastname: Voigt
authors.forename: Albena
authors.initials: A
authors.lastname: Lederer
authors.forename: Dietmar
authors.initials: D
authors.lastname: Auhl
authors.forename: Helmut
authors.initials: H
authors.lastname: Münstedt
mesh_terms: D002850:Chromatography, Gel / Q000379:methods*; D011126:Polypropylenes / Q000032:analysis*; D012212:Rheology / Q000379:methods*
chemical_list: D011126:Polypropylenes