Materials with smart, intelligent, or adaptive denomination are invading successfully the market. Innovative materials developments for automotive applications are strongly driven by three socio-economical trends: Pleasure diversity and personalization, well-being, health and environment protection, material availability and cost. Automotive interiors plastic parts and assemblies increasingly need to meet strict visual design requirements such as surface styling, gloss, color, brand identity, and safety or ease-of-use markings. Some examples of decorative technologies recently introduced in Renault vehicles are given and examined by the relevance of PVD technology for special features: technological advantages compared with other metallization technologies, functionality integration and green wave. Customers pay more attention to the improvement cabin air quality and to the reduction of life/animal/tobacco smells than in the past. They want to be sure that their car will not harm their health or even contribute to protecting it. Main topics regarding air quality are: Protection against exterior pollution, no bad smell from the cars, safe interior - Reduction of VOCs emission of interior materials. Future needs are: Interior pleasant atmosphere, deodorizing interior materials (no odor of life), protection against micro organisms. Functional surface are invading the market. They allow new features for automotive applications. For many people, their car is a part of their home and, for example, the never-washed textiles in the car should have the smell of freshness without bacteria and fungi. (Anti bacterial product, self cleaning surface). The generation of materials described so far is functional and passive. Electroactive Polymers (EAP) received relatively little attention due to their limited actuation capability. These materials have the closest functional similarity to biological muscles enabling to engineer novel capabilities. Electroactive polymers work much like human muscles, expanding and contracting rapidly and silently, based on variable voltage input levels. Generally, EAP materials can generate strains that are as high as two orders of magnitude greater than the striction-limited, rigid and fragile piezoelectric ceramic. Further, EAP materials are superior to shape memory allows (SMA) in higher response speed, lower density and greater resilience. EAP materials can be divided into two major groups based on : ionic (involving mobility or diffusion of ions) and electronic (driven by electric field or Maxwell forces). The electronic polymers (electrostrictive, electrostatic, piezoelectric and ferroelectric) can be made to hold the induced displacement under activation of a DC voltage, allowing them to be considered for robotic applications. In contrast, ionic EAP materials (gels, polymer-metal composites, conductive polymers, and carbon nanotubes) are driven by diffusion of ions and they require an electrolyte for the actuation mechanism. Their major advantage is the requirement for drive voltages as low as 1-2 volts. At Renault, teams work not only on the process and on the design of plastic parts but also on materials to meet the performance requirements while stongly reducing the cost. Steering wheels are traditionally made with urethane foaming and painting during the molding process or leather wrapping. The use of injected thermoplastic elastomers (TPE) wheel reduces the cost with a high-perceived quality and avoids burrs due to classical process.


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