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Identification of polybutene-1 (PB-1) in easy peel polymer structures

: Sängerlaub, Sven; Reichert, Katrein; Sterr, Julia; Rodler, Norbert; Haar, Daniela von der; Schreib, Ina; Stramm, Cornelia; Gruner, Anita; Voigt, Jens; Raddatz, Heike; Jesdinszki, Marius


Polymer testing 65 (2018), S.142-149
ISSN: 0142-9418
Fraunhofer IVV ()

Polybutene-1 (PB-1) is dispersed via extrusion in polyethylene (PE) based sealing layers to achieve ‘easy peel’ properties. PB-1 forms islands there. During opening of packagings with such sealing layers, cohesive fracture occurs within the sealed area along these PB-1 islands. The aim of this study was to find suitable methods for the identification of PB-1 in such PE based sealing layers. For this investigation PE-LD films with 3, 6, 9, 12 and 15 wt.-% PB-1 were extruded. FTIR spectroscopy and FTIR microscopy are suitable methods to identify low concentrations PB-1 in PE-LD layers in opposite to GC-FID and DSC. Raman spectroscopy is a suitable method to distinguish PB-1 from PE-LD.