The U.S. military’s demand for lighter, stronger, and rapidly deployable materials is colliding with an equally urgent requirement: sustainability. The challenge is not simply to engineer high-performance composites, but to do so in a way that reduces environmental impact and reliance on finite resources. At Rowan University’s Advanced Materials & Manufacturing Institute (AMMI), chemical engineer Joe Stanzione, Ph.D., is directing research that aims to meet both needs.
Much of today’s military-grade plastic composites, like those used in aerospace structures, vehicle components, and protective gear, are derived from petroleum. This dependence carries multiple drawbacks—geopolitical vulnerability from reliance on foreign oil, environmental degradation from extraction and processing, and the finite nature of fossil resources. “Fossil fuels are not being produced as quickly as we’re consuming them,” Stanzione said. “But if we could use a fraction of all of the Earth’s plant matter that’s produced on an annual basis as sustainable plastic composites, we could replace part, if not all, of the petroleum-derived materials made—and potentially give back to the environment.”
Plant-based feedstocks offer more than just a renewable supply chain. Many bio-derived chemicals are inherently less toxic than the petrochemical counterparts they could replace. For defense applications, this could translate into lower costs not only in raw materials but also in handling, manufacturing safety, and long-term environmental remediation. The implications extend to civilian industries as well, where regulatory pressures and consumer demand are pushing for greener materials.
Within AMMI’s Advanced Composites and Sustainability Initiatives, Stanzione’s team is advancing multiple manufacturing frontiers. Additive manufacturing, particularly 3D printing, is being leveraged to rapidly prototype and produce components from bio-based composites. This capability is critical for military logistics, where on-demand production in remote or contested environments can reduce supply chain vulnerabilities. By tailoring the microstructure of plant-derived polymers during the printing process, the team aims to achieve mechanical properties competitive with, or superior to, conventional composites.
Another area of focus is cold-spray technology, a solid-state deposition process in which particles are accelerated at supersonic speeds to bond with a substrate. This technique can be used to repair damaged components or enhance the surface properties of existing materials without the thermal degradation associated with traditional welding or coating. Integrating plant-based materials into cold-spray feedstocks could open new possibilities for in-field repairs that are both structurally robust and environmentally benign.
One of the more unconventional projects involves extracting useful polymers from birch tree bark without harming the trees. Bark contains complex biopolymers such as suberin and lignin, which can be chemically modified to produce durable, high-performance plastics. By sourcing these materials sustainably, the process avoids deforestation while tapping into a renewable, underutilized resource stream. This approach reflects a broader trend in green chemistry: designing processes that minimize waste, use benign solvents, and operate under energy-efficient conditions.
Chemical engineering, as Stanzione emphasizes, is fundamentally about efficiency—optimizing reactions, reducing energy inputs, and ensuring that feedstocks are sustainable over the long term. “Now, we’re applying that thinking to doing better at using our natural resources and significantly reducing our environmental impact on the planet while improving life for all,” he said. In the context of defense manufacturing, this mindset aligns with strategic goals of operational resilience, cost efficiency, and environmental stewardship.
The integration of bio-based composites into advanced manufacturing workflows is not without challenges. Plant-derived polymers can exhibit variability in composition depending on growth conditions, requiring precise control over processing parameters. Mechanical performance must meet stringent military specifications, which often necessitates hybrid approaches combining bio-based and synthetic constituents. Yet, the potential benefits—in reduced carbon footprint, enhanced supply security, and safer production environments—are driving sustained research investment.
As aerospace, automotive, and robotics sectors increasingly seek materials that balance performance with sustainability, the innovations emerging from AMMI’s laboratories could have far-reaching impact. The convergence of green chemistry, additive manufacturing, and advanced repair technologies points toward a future where high-performance materials are not only engineered for strength and durability, but also for harmony with the planet’s ecological systems.