Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 64: Flow-Induced Structures in Complex Fluids (with DRG, Deutsche Rheologische Gesellschaft, and DY)

CPP 64.3: Vortrag

Donnerstag, 19. März 2015, 10:00–10:15, C 264

Relation between rheological and GPC triple detection characterization of photo-oxidated LDPE — •Víctor Hugo Rolón-Garrido, Matthias Kruse, and Manfred H. Wagner — Chair of Polymer Engineering/Polymer Physics Berlin Institute of Technology (TU Berlin), Fasanenstr. 90, D-10623, Berlin

Sheets of low-density polyethylene (LDPE) were subjected to photo-oxidation in the presence of air using a xenon lamp to irradiate the samples for times between 1 day and 6 weeks. The formation of long-chain branching up to 1 week of degradation and the competition between chain scission and crosslinking at longer periods of radiation were investigated by rheological characterization, Fourier transform infrared spectroscopy, and the solvent extraction method (Rolón-Garrido and Wagner. Polym Degrad Stabil 2014, 99:136, Rolón-Garrido and Wagner. J Rheol 2014, 58:199). The same samples are studied here by size exclusion chromatographic characterization using triple detection (concentration, light scattering and viscosity). The results are correlated with the model parameters (beta and f2max) of the MSF model. It is confirmed that the parameter beta correlates with the gel content, while f2max is found to correlate with the experimentally determined contraction factors. By comparing the data of this study with those obtained earlier for polystyrene comb melts with well defined structure, the influence of the branching frequency on f2max becomes evident.