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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.56: Poster

Dienstag, 26. Februar 2008, 14:30–20:00, Poster A

Taylored Interfaces in PP-Glass Model Composites — •Hanna Brodowsky and Edith Mäder — Leibniz-Institut für Polymerforschung Dresden, Hohe Str. 6, D-01069

The interface between the reinforcing fiber and polymer matrix plays a crucial role for a composite's mechanical properties. In the vicinity of the fiber, a three dimensional "interphase" is formed on the fiber surface, in which the properties of the matrix differ from those in the bulk. This interphase can be taylored by using a suitable sizing (surface modification) of the fiber, e.g. suppressing or promoting heterogeneous nucleation of a thermoplastic matrix.

Polypropylene-glass fiber composites are prepared as single fiber model composites with varying sizings and different PP chain lengths. Static tests permit insights in the interfacial characteristics such as fracture energy release rate, shear strength and modulus. Cyclic tests on these model composites are used to study the nature of dissipative processes and the damage behaviour. An AFM characterisation of the fiber fracture surface provides supplementary information.