Polymer matrix composites become more and more important for lightweight construction components, smart textiles and numerous other engineering fields. The interaction between the polymer and the reinforcement depends on the chemical, physical and mechanical properties, and on the manufacturing process of the composite. Including, the presence of functional groups in the chemical structure which contributes to chemical interactions, surface energy and polarity, and processing parameters, such as temperature, pressure, time and humidity, and mechanical and geometrical properties, like the surface structure. In addition, surface modification may result in a more favorable adhesion between the two compartments in composites. Despite of a large number of studies on composites, more knowledge about specific polymer-polymer interactions is still needed to enhance the development of composites for high performance applications. In this study we attempted to investigate the interface between polyamide and polypropylene as a model system. For this purpose, polyamide films were laminated with low-pressure plasma treated polypropylene films. It was found that laminates containing plasma-treated polypropylene have an increased shear strength compared to the non-modified laminates. Fourier transform infrared spectroscopy analysis demonstrated a small amount of carbonyl groups on the surface of plasma-treated polypropylene films. This explains the increased surface energy of the polypropylene film and the enhanced shear strength of the laminates. Additionally, melt rheological analysis and dynamic mechanical thermal analysis confirmed the increased interfacial strength between polyamide and plasma-treated polypropylene.