Characterization of interdiffusion between different coextruded polymers via confocal Raman microscopy
Sprache des Titels:
Englisch
Original Buchtitel:
AIP Conference Proceedings
Original Kurzfassung:
In polymer multilayer materials, the adhesion between the individual layers is an essential feature governing the
overall product quality. For compatible polymer pairs, the interpenetration of the macromolecules across the interface, the
so-called interdiffusion, is the main adhesion mechanism and the resulting interdiffusion layer thickness is a measure for
the adhesive strength. To gain insight into the occurrences at polymer-polymer interfaces, especially under processing
conditions, methods to characterize the diffuse interphase are necessary. Confocal Raman microscopy proves to be an
excellent tool for this application. In this work, a measurement and evaluation procedure to determine the diffusion profiles
and the thickness of the interdiffusion layer based on Raman imaging is developed and illustrated for the highly compatible
polymer pair PMMA and SAN. For diffusion experiments under static conditions, the influence of contact time and
temperature is shown and the additional effect of interfacial shear stress is established for co-extruded samples. Based on
these findings, an enhanced understanding of phenomena at co-extruded polymer-polymer interfaces can be acquired,
which benefits the development of novel multi-layered products.