Determination of low amounts of long-chain branches in polypropylene using a combination of chromatographic and rheological methods.
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.
Krause
Beate
B
Leibniz-Institute of Polymer Research Dresden, Hohe Strasse 6, Dresden 01069, Germany. krause-beate@ipfdd.de
Voigt
Dieter
D
Lederer
Albena
A
Auhl
Dietmar
D
Münstedt
Helmut
H
D002850:Chromatography, Gel / Q000379:methods*; D011126:Polypropylenes / Q000032:analysis*; D012212:Rheology / Q000379:methods*
D011126:Polypropylenes