Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 11: POSTER Disperse Polymer Systems

CPP 11.34: Poster

Tuesday, March 28, 2006, 17:00–19:00, P3

Studies on the Interphase in PP-Glass Composites — •Hanna M. Brodowsky and Edith Mäder — Leibniz-Institut für Polymerforschung Dresden, Hohe Str. 6, D-01069 Dresden

In composites, the interface between the components is essential for improving the mechanical properties. By using a suitable sizing (surface modification) of the fiber, the interface may be varied, e.g. by suppressing or promoting heterogeneous nucleation of a thermoplastic matrix. In the latter case, a three dimensional transcrystallized {∖dq}interphase{∖dq} with properties differing from those of the bulk matrix is formed.

Polypropylene-glass fiber composites with a number of different sizings and different PP chain lengths are prepared as single fiber model composites. These are studied in quasistatic or cyclic load tests. Static tests permit insights in the interfacial characteristics such as fracture energy release rate, shear strength and modulus. Cyclic tests on these model composites can be used to study the nature of dissipative processes and the damage behaviour. An AFM characterisation of the pulled out fibers provides supplementary information. Additionally, the dynamic behavior of bulk composites is characterized.