Berlin 2001 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 18: Poster: Polymer Blends, Heterogeneous Systems, Colloids and Nanoparticles, Interfaces, Polyelectrolytes

CPP 18.26: Poster

Wednesday, April 4, 2001, 12:30–15:00, AT1

Ellipsometric in situ study of polymer melts at the melt/substrate interface — •Thimo Bastuck¹, Michael Himmelhaus¹, Manfred Buck^1,2, Michael Grunze¹, and Matthias Voetz³ — ¹Angewandte Physikalische Chemie, Universität Heidelberg, INF 253, 69120 Heidelberg — ²School of Chemistry, North Haugh, St Andrews, Fife KY16 9ST, Scotland — ³BAYER-AG, ZF-FPG, Geb. E41/320, 51368 Leverkusen

In the injection molding of polymers various additives (e.g. softeners, mold release agents, stabilizers) are used to improve the material’s performance in both the molding process and the application of the product. In order to ensure that the additives function properly, it is very important to study their behavior during polymer melting and subsequent solidification.

We present a spectral ellipsometer-based method to investigate in situ the segregation of polymer melts at the melt/substrate interface. The temperature can be adjusted between room temperature and 320^∘C and data can be obtained at constant temperature as well as during cool down. To mimic the mechanical stress acting on the melt during injection molding, shear rates of more than 100/s can be applied. Various procedures for the qualitative and quantitative analysis of the segregation behavior are presented and discussed in terms of their pros and cons.