Sustainable Innovation: Recycled Plastics and Plasma Technology Revolutionize High-Performance Electromechanical Assemblies

Jena/Suhl, Germany – July 3, 2026 – In a significant stride towards sustainable engineering, a collaborative research effort between the Innovent e. V. research association and febana Feinmechanische Baugruppen has unveiled groundbreaking methods for preparing bio- and recycled plastics to meet the stringent demands of high-performance electromechanical assemblies. The findings demonstrate that through advanced surface treatment, these environmentally friendly materials can achieve the critical levels of sealing integrity and mechanical robustness required for applications in sectors like automotive and industrial electronics, traditionally dominated by fossil-based polymers.

The research directly addresses a growing industry imperative: the need to integrate sustainable materials without compromising performance in components exposed to harsh operational environments. By successfully employing atmospheric pressure plasma technology, the project partners have overcome key adhesion challenges, paving the way for a new generation of durable and eco-conscious electromechanical solutions.

A New Era for Sustainable Engineering: Main Facts

The core of this transformative research lies in its dual focus: evaluating the suitability of bio- and recycled plastics for high-stress electromechanical applications and developing effective methods to ensure their long-term reliability. Electromechanical assemblies, such as connector and sensor housings found in industrial machinery and automotive systems, are routinely subjected to extreme temperature fluctuations, pervasive moisture, and corrosive chemical agents. In such conditions, the integrity of the bond between embedded metal components, like circuit boards and contacts, and their protective plastic housings is paramount. Any ingress of fluids could lead to catastrophic failure, including short circuits, corrosion, and diminished performance.

The joint project meticulously investigated how these sustainable plastic alternatives could be processed to guarantee permanent, hermetic seals and robust mechanical performance. While recycled plastics demonstrated promising inherent properties, bioplastics often required specific filler optimization to achieve comparable strength. The true breakthrough, however, came with the exploration of surface pre-treatment techniques. After rigorous testing, atmospheric pressure plasma activation emerged as the superior method for enhancing the adhesion between plastic and metal components, leading to dense, impervious material composites. This innovation not only validates the potential of recycled plastics for technically demanding applications but also offers a scalable solution for reducing the industry’s reliance on virgin fossil resources, thus actively contributing to a more circular economy.

A Journey of Material Discovery and Refinement: Chronology of Innovation

The path to this significant breakthrough was characterized by a systematic and interdisciplinary approach, marrying fundamental material science with practical engineering application. The collaboration between Innovent e. V., renowned for its expertise in material research and surface technology, and febana Feinmechanische Baugruppen, a specialist in precision mechanical assemblies, was instrumental in guiding the project from concept to concrete results.

Initiating the Collaborative Endeavor

The genesis of the project stemmed from a shared recognition of the urgent need for more sustainable manufacturing practices within the electronics and automotive industries. Both Innovent and febana identified the critical gap between the increasing availability of recycled and bio-based polymers and their limited adoption in high-reliability applications. Traditional electromechanical components, due to their exposure to demanding operational environments, typically rely on high-performance, often fossil-derived, engineering plastics. The challenge was clear: how to bridge this performance gap with sustainable alternatives.

The initial phase involved defining the precise scope and objectives of the research. This included identifying the most promising classes of recycled and bioplastics, outlining the specific performance criteria (e.g., sealing integrity, mechanical load-bearing capacity, chemical resistance), and establishing a robust methodology for evaluation. The project’s overarching goal was not merely to find sustainable materials but to develop processes that would enable their reliable integration into complex, critical assemblies.

Designing the Testbed for Real-World Challenges

To accurately analyze the intricate interplay between plastic and metal components under stress, febana took the lead in developing a sophisticated "Musterbaugruppe" – a meticulously engineered sample assembly. This testbed was designed to replicate the complex geometries and operational conditions typical of actual electromechanical housings, such as those found in sensor units or connectors. The sample assembly incorporated various metal inserts and conductor paths encapsulated within the plastic matrix, allowing for a precise evaluation of the interface integrity.

The design phase was critical in ensuring that the subsequent testing would yield relevant and actionable data. Parameters such as the material’s coefficient of thermal expansion (CTE) mismatch, the potential for shrinkage during molding, and the specific geometries affecting adhesion were all carefully considered in the design of the Musterbaugruppe. This allowed the researchers to isolate and study the performance of the material composites under conditions mirroring those of industrial and automotive deployment.

Rigorous Evaluation and Early Findings

With the testbed established, the project moved into the comprehensive evaluation phase. This involved subjecting various formulations of recycled and bioplastics to a battery of tests designed to assess their mechanical and thermal properties, as well as their chemical resistance. Key metrics included tensile strength, impact resistance, thermal cycling stability, and resistance to common automotive fluids and industrial solvents. The chemical composition of the plastics, particularly the presence of fillers and additives, was also meticulously analyzed to understand its impact on performance.

Initial findings revealed that while recycled plastics generally performed well and met the demanding specifications, bioplastics presented a more varied performance profile. Their mechanical strength, in particular, was found to be highly dependent on the type and concentration of fillers used in their formulation. This indicated that while bioplastics hold immense promise, their application requires more tailored material development. Crucially, this phase highlighted a common hurdle for both material classes: achieving robust, long-lasting adhesion to metal components, especially under dynamic and challenging environmental conditions. This adhesion gap became the focal point for the subsequent phase of surface treatment investigations, setting the stage for the pivotal role of plasma technology.

Unpacking the Technical Challenges and Solutions: Supporting Data

The successful integration of recycled and bio-based plastics into high-performance electromechanical assemblies required a deep dive into the specific technical hurdles these applications present and the scientific principles behind their innovative solutions.

The Gauntlet of Electromechanical Applications

Electromechanical components are the silent workhorses of modern technology, operating across a spectrum of demanding environments. In the automotive sector, parts located in engine compartments or undercarriages must withstand extreme temperature swings, from sub-zero winter conditions to scorching summer heat, coupled with exposure to road salts, oil, fuel, and vibrations. Industrial sensors and control units, on the other hand, might face constant humidity, corrosive chemicals, abrasive dust, and sustained mechanical stress from machinery.

The fundamental requirement for these components is hermetic sealing – preventing any moisture or contaminants from reaching the sensitive internal electronics. Failure to achieve this leads to premature component degradation, short circuits, and potential system malfunctions, impacting safety and reliability. The dilemma for engineers has long been how to incorporate sustainable materials, which often come with inherent variability or lower performance ceilings compared to virgin fossil polymers, into these critical applications without compromising the rigorous standards of reliability. Traditional engineering plastics like PBT, PA, or PPS offer predictable performance but contribute to fossil resource depletion.

Material Properties Under Scrutiny

The research meticulously characterized the properties of both recycled and bioplastics. Recycled plastics, while offering clear environmental advantages by reducing waste and conserving resources, present unique challenges. Their exact composition can vary depending on the source material and recycling process, potentially leading to inconsistencies in mechanical strength, thermal stability, and chemical resistance. Furthermore, previous thermal processing cycles can sometimes degrade polymer chains, affecting overall performance. The success of recycled plastics in this project underscores the importance of careful material selection, sophisticated processing techniques, and possibly the use of compatibilizers to ensure consistent, high-quality performance.

Bioplastics, derived from renewable biomass sources, are appealing for their reduced carbon footprint. However, their mechanical properties, particularly tensile strength and impact resistance, can often be lower than those of their fossil-based counterparts. The study specifically noted that the performance of bioplastics was heavily "dependent on the filler used." Fillers like glass fibers, carbon fibers, or mineral particles are commonly incorporated into polymers to enhance strength, stiffness, and thermal stability. For bioplastics, the selection and optimization of these fillers, along with their compatibility with the bio-polymer matrix, are critical to achieving the necessary mechanical robustness for demanding applications. Without adequate reinforcement, bioplastics might not withstand the stresses associated with thermal cycling or mechanical loads in an electromechanical assembly. The research had to balance the sustainability aspect with the functional requirements, often a complex trade-off in material science.

Plasma: The Game-Changer for Adhesion

The Achilles’ heel for many material composites, especially those involving dissimilar materials like plastics and metals, is the interface adhesion. This is where the project’s investigation into surface pre-treatment proved pivotal. The team explored two primary methods: flame treatment and atmospheric pressure plasma activation.

Flame treatment, a common technique for surface modification, involves briefly exposing the material to a high-temperature flame. This can oxidize the surface, increasing its polarity and improving wettability. However, for the complex, often intricate geometries of electromechanical assemblies, flame treatment proved unsuitable. The difficulty in achieving uniform treatment across varied surfaces, the risk of overheating and degrading sensitive plastic areas, and the potential for safety concerns made it impractical for precision components.

In contrast, atmospheric pressure plasma emerged as the game-changer. Plasma, often described as the fourth state of matter, is an ionized gas containing free electrons, ions, and reactive neutral species. When a plastic surface is exposed to this plasma, a cascade of physical and chemical changes occurs. The high-energy particles in the plasma bombard the surface, cleaning it by removing organic contaminants, micro-roughening it at a nanoscale, and, most importantly, introducing highly reactive functional groups (e.g., hydroxyl, carbonyl, carboxyl groups). These functional groups significantly increase the surface energy and wettability of the plastic, making it far more receptive to bonding with potting compounds, adhesives, or overmolding materials used to encapsulate metal components.

The study highlighted that "different plastics require different plasma parameters." This is a crucial detail, as the chemical structure of polymers varies widely. For instance, a polypropylene surface might respond optimally to one set of plasma parameters (e.g., gas composition, power, treatment time), while a polyamide or a bioplastic might require another. Tailoring these parameters ensures maximum activation without causing surface degradation, allowing for optimized adhesion specific to each material. The successful outcome was rigorously validated through subsequent "Dichtheitsprüfungen unter praxisnahen Bedingungen" (leak tests under practical conditions). These tests, which simulate operational stresses like pressure differentials, thermal shocks, and immersion, confirmed that the plasma-treated test assemblies achieved the necessary hermetic sealing, signaling a significant technological leap.

Voices from the Forefront of Innovation: Official Responses and Vision

The successful conclusion of this research project has been met with enthusiasm from both Innovent and febana, who view these findings not merely as a scientific achievement but as a vital contribution to sustainable industrial practices.

Innovent’s Perspective: Pioneering Sustainable Solutions

According to a spokesperson for Innovent e. V., the research underscores the association’s commitment to advancing material science for a more sustainable future. "This project unequivocally demonstrates that high-performance engineering and ecological responsibility are not mutually exclusive," stated an Innovent representative. "By validating the use of recycled plastics in such technically demanding applications, we are providing tangible evidence that a circular economy model can indeed be implemented in high-tech sectors like automotive and industrial electronics. Our findings pave the way for manufacturers to confidently adopt more sustainable materials without compromising on the critical performance and reliability that these applications demand."

Innovent further emphasized the interdisciplinary nature of the collaboration, highlighting how the synergy between fundamental research and application-driven engineering was key to the project’s success. "The combination of Innovent’s deep expertise in surface modification and polymer science with febana’s practical understanding of electromechanical assembly challenges created a powerful research environment," the representative added. "This collaborative spirit is essential for translating scientific breakthroughs into real-world industrial solutions that address global sustainability imperatives."

Febana’s Application-Driven Insight

From febana Feinmechanische Baugruppen’s perspective, the research represents a significant step forward in their ability to offer greener solutions to their clients while maintaining their reputation for precision and reliability. An engineering team leader at febana underscored the practical implications: "Our customers are increasingly seeking sustainable alternatives, but never at the expense of performance or durability. This research allows us to meet that demand head-on. The successful development and testing of our sample assemblies, particularly the validation of plasma treatment for creating dense, robust material composites, means we can now confidently integrate recycled plastics into components that must withstand the harshest operating conditions."

Febana’s experts highlighted the competitive advantage this innovation provides. "Being able to offer electromechanical assemblies that utilize recycled content, while passing stringent leak tests and meeting mechanical load requirements, positions us at the forefront of sustainable manufacturing," the team leader explained. "This is not just about environmental compliance; it’s about future-proofing our product lines, enhancing supply chain resilience by reducing reliance on volatile fossil-based raw materials, and delivering superior value to our partners." The company expressed its intention to integrate these findings into their production processes, expanding the portfolio of sustainable, high-performance components available to their diverse clientele.

Paving the Way for a Greener, More Resilient Future: Implications and Future Horizons

The implications of this collaborative research extend far beyond the specific electromechanical assemblies studied, signaling a broader paradigm shift in material science and industrial manufacturing.

Environmental and Economic Impact

The most immediate and profound impact of this research is its contribution to environmental sustainability. By enabling the widespread adoption of recycled and, to a lesser extent, bioplastics in demanding applications, the project directly facilitates a reduction in the consumption of virgin fossil raw materials. This translates into a smaller carbon footprint associated with manufacturing, less reliance on non-renewable resources, and a more robust circular economy model where materials are reused and re-purposed, rather than discarded. Quantifying this impact, even generally, suggests a significant reduction in CO2 emissions and plastic waste entering landfills or incinerators. Furthermore, the long-term economic benefits could be substantial. Reduced dependency on fluctuating global oil prices for raw materials, combined with the creation of stable, local recycling loops, could lead to greater supply chain resilience and potential cost savings for manufacturers.

Expanding the Technological Frontier

The insights gained from this project are highly transferable and possess the potential to revolutionize various industries. Beyond the automotive sector, where stringent requirements for durability and safety are paramount, these plasma activation techniques could unlock new applications for sustainable materials in medical devices (e.g., sterile housings, diagnostic equipment), consumer electronics (e.g., durable smartphone components, wearable technology), aerospace (e.g., lightweight interior components), and smart infrastructure (e.g., robust sensor enclosures for IoT applications).

Moreover, the understanding of plasma activation’s ability to modify surface properties extends beyond just improving adhesion for encapsulation. As Innovent noted, these findings can be applied to enhance the printability of plastic surfaces, crucial for branding, labeling, and functional printing of circuits. It could also improve adhesion for protective coatings, paints, and even for biomedical surface functionalization to promote cell growth or prevent biofouling. This broad applicability positions plasma technology as a versatile tool for advanced material processing.

A Catalyst for Industry-Wide Change

Looking ahead, this research serves as a blueprint for other industries grappling with the dual challenge of performance and sustainability. It demonstrates that innovation in material science, coupled with advanced processing techniques, can overcome long-standing barriers to green manufacturing. Future research directions will likely focus on further optimizing plasma processes for mass production, exploring new combinations of bio-based polymers with improved mechanical properties, and developing industry-wide standards for the performance and certification of these sustainable material composites. Long-term degradation studies, cost-effectiveness analyses for large-scale implementation, and the integration of artificial intelligence for predictive material performance will also be critical next steps.

Ultimately, the work by Innovent and febana underscores a crucial message for the global manufacturing sector: the imperative for sustainability is no longer merely an ideal but a tangible performance metric. By showing that recycled and bio-based plastics can meet the highest technical demands when intelligently processed, this research stands as a powerful catalyst for a greener, more resilient, and technologically advanced industrial future.