High performance carbon fiber reinforced plastics (CFRP) have firmly established themselves in modern airplanes. Repairs, however, are very laborious and often even impossible. Most of the time, the entire component has to be replaced. The PYCO Research Division at the Fraunhofer Institute for Applied Polymer Research IAP in Potsdam, Germany, has developed a simple, cost-effective and energy-efficient way to make sustainable repairs. Moreover, entire components can be completely recycled in a process in which the expensive carbon fibers are reclaimed. Researchers will present their developments at JEC World in Paris from March 8 to 10, 2016 in Hall 5a, stand D52.
Composites made from crosslinked polymers – so-called thermosets – are reinforced with carbon, glass or natural fibers. Their rich spectrum of properties have increased their importance in aerospace, the automotive industry, wind power generation, shipbuilding, railway construction, building construction, and civil engineering.
Yet, even the best material can become damaged or show wear and tear. Engineers must then decide whether the defective area should be painstakingly and expensively patched, or whether the entire component has to be replaced.
“Repairing and recycling polymer-based composites are inseparably linked to resource efficiency and sustainability”, explains Dr. Christian Dreyer, who leads the Research Division Polymeric Materials and Composites PYCO at the Fraunhofer IAP. “Finite resources increase the importance of sustainable management and the use of recyclable and repairable polymer materials”, says Dreyer.
The researchers have therefore developed a process for repairing and chemically recycling fiber-reinforced thermosets. These are especially used as matrix resins in composites for high-stress components.
The crosslinked polymers form a very rigid structure that gives the component its shape. But it is precisely this structure that creates a problem when it comes to repairing or recycling the component. Unlike thermoplastics, once thermosets are cured, it is very difficult to chemically decompose them.
Repairing and reclaiming – simple, cost-effective and energy-efficient
“We have developed a fast and gentle way for a chemical recycling which allows highly crosslinked plastics to be broken down into their basic elements”, Dreyer explains. This development enables a component to be completely recycled or to be repaired locally. The resin matrix is gently removed from the defective area without significantly impacting the mechanical properties of the reinforcement fiber. The exposed fibers are then refilled with repair resin and cured.
The new process is also setting the standard for recycling. Until now discarded components have been either incinerated or shredded to be used as fillers. The Fraunhofer researchers have the crucial advantage when it comes to chemical recycling: the often expensive reinforcement fibers are reclaimed alongside the decomposed polymer matrix. Due to the limited size of the components, the fibers are no longer continuous filaments. Nevertheless there are many applications that use fibers measuring up to several centimeters.
Professor Alexander Böker, who heads up the Fraunhofer IAP explains: “This recycling process is of particular interest to companies since the matrix material can also be recycled on an industrial scale. This allows sufficient quantities of new ‘recycling thermosets’ to be synthesized. The Fraunhofer Pilot Plant Centre for Polymer Synthesis and Processing PAZ – a joint initiative of the Fraunhofer Institute for Applied Polymer Research IAP in Potsdam-Golm and for Microstructure of Materials and Systems IMWS in Halle/Saale – enables us to manufacture these resins in industry-relevant quantities.
Visit us at JEC World!
JEC World 2016 | March 8 – 10, 2016, Paris (F) |
Joint stand run by Carbon Composites e.V., Halle 5a, Stand D52
Exhibition grounds: Paris Nord Villepinte Exhibition Centre |
Address : CD 40, ZAC Paris Nord 2, 93420 Villepinte, France
Fraunhofer Institute for Applied Polymer Research IAP
The Fraunhofer IAP in Potsdam-Golm, Germany, specializes in research and development of polymer applications. It supports companies and partners in custom development and optimization of innovative and sustainable materials, processing aids and procedures. In addition to the environmentally friendly, economical production and processing of polymers in the laboratory and pilot plant scale, the institute also offers the characterization of polymers. Synthetic petroleum-based polymers as well as biopolymers and biobased polymers from renewable raw materials are in the focus of the institute’s work. The applications are diverse, ranging from biotechnology, medicine, pharmacy and cosmetics to electronics and optics as well as applications in the packaging, environmental and wastewater engineering or the aerospace, automotive, paper, construction and coatings industries. | Director: Prof. Dr. Alexander Böker
Dr. Sandra Mehlhase | Press & Public Relations
Geiselbergstraße 69 | 14476 Potsdam-Golm, Germany
Phone: +49 331 568-1151 | email: firstname.lastname@example.org
Dr. Sandra Mehlhase | Fraunhofer-Institut für Angewandte Polymerforschung IAP
Solar Collectors from Ultra-High Performance Concrete Combine Energy Efficiency and Aesthetics
16.01.2017 | Fraunhofer-Institut für Solare Energiesysteme ISE
Energy-Efficient Building Operation: Monitoring Platform MONDAS Identifies Energy-Saving Potential
16.01.2017 | Fraunhofer-Institut für Solare Energiesysteme ISE
A Swedish-German team of researchers has cleared up a key process for the artificial production of silk. With the help of the intense X-rays from DESY's...
For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.
According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
24.01.2017 | Physics and Astronomy
24.01.2017 | Life Sciences
24.01.2017 | Health and Medicine