{"id":82901,"date":"2020-06-26T07:22:55","date_gmt":"2020-06-26T05:22:55","guid":{"rendered":"https:\/\/renewable-carbon.eu\/news\/?p=82901"},"modified":"2020-12-12T13:36:44","modified_gmt":"2020-12-12T12:36:44","slug":"stronger-stiffer-greener-carbon-negative-natural-fiber-composites","status":"publish","type":"post","link":"https:\/\/renewable-carbon.eu\/news\/stronger-stiffer-greener-carbon-negative-natural-fiber-composites\/","title":{"rendered":"Stronger, stiffer, greener: Carbon-negative natural-fiber composites"},"content":{"rendered":"

Lightening the weight of the machines that move people by land, sea and air is beneficial for many reasons, including improved fuel efficiency and the ability to carry higher payloads or added safety systems. A 10% reduction in the weight of a passenger car, for instance, leads to about a 6% improvement in fuel economy.<\/strong><\/p>\n

One key strategy to reduce weight is to design structures using lighter materials with improved properties, such as those with greater specific strength and stiffness. Given their light weight, neat polymers are attractive materials for weight reduction, but they\u2019re neither strong enough nor stiff enough for structural applications. As a result, manufacturers across industries add reinforcing fibers, such as glass and, more recently, carbon fiber to add strength and stiffness to the material.<\/p>\n

But producing the fibers \u2014 whether glass or carbon \u2014 for use in today\u2019s advanced structural composites requires energy, and generating this energy releases greenhouse gases into the atmosphere.<\/p>\n

\u201cIt takes a lot of energy to make these reinforcing materials,\u201d said ME Professor Alan Taub. \u201cUnfortunately, this makes many types of fiber-reinforced lightweight composites carbon positive and compels us to ask how we can do better. How can we produce advanced materials that are carbon neutral or, better yet, carbon negative?\u201d<\/p>\n

Taub, in collaboration with ME Research Associate Professor Mihaela Banu, are looking beyond carbon neutrality and toward nature for a greener alternative: natural fibers from plants, since they absorb \u2014 rather than release \u2014 CO2<\/sub> as they grow.<\/p>\n

Others, too, have looked at natural fibers to improve the properties of polymer composites, \u201cbut the improvements to date haven\u2019t been enough to enable widespread use in industrial applications,\u201d said Taub, who holds a joint appointment in Materials Science and Engineering and also directs the University\u2019s recently launched Michigan Materials Research Institute. \u201cOur challenge is to find new ways to improve the strength and stiffness of these natural fibers.\u201d<\/p>\n

A triple challenge<\/h3>\n

Taub\u2019s group is working with bamboo, hemp and flax, adding an environmentally-friendly nanomaterial to particular cells in the plants during growth or after harvesting to improve strength and stiffness. The cells form fibers, and these would then be extracted and used to reinforce the polymer composites.<\/p>\n

Part of the challenge, noted Taub, is that plant transport mechanisms are extremely complex, which makes getting even nanoscale material to the targeted cells difficult. And therein lies another challenge \u2014 the need to work simultaneously at multiple scales. Extracting the strengthened fibers presents yet another hurdle since current methods can cause the fibers to undergo damage. The team is developing new ways to extract them from the plant to avoid this.<\/p>\n

Abundant applications<\/h3>\n

With three decades of auto industry experience, Taub first is looking at automotive applications for the natural-fiber reinforcements under development. \u201cBut we\u2019re certainly not restricted to one application \u2014 everything from appliances and sporting goods to commercial aircraft and ocean-going vessels could make use of natural-fiber-reinforced composites if we\u2019re successful,\u201d he said.<\/p>\n

And although the process for producing the strong natural fibers will be different than for glass or carbon fibers, the processing and equipment used for forming the resulting polymer composite into structures remains for the most part the same from an industrial perspective.<\/p>\n

\u201cWhat we\u2019re looking at is a material substitution that fits into existing processing capabilities,\u201d Taub said. This means the natural fibers have potential for large-scale implantation, which is key to positively impacting the environment.<\/p>\n

\u201cTo have a real impact, we have to replace tons of material. Fortunately, enough of this plant material is already being grown, so what we\u2019re focused on now is improving the properties, improving the extraction methods and making these advances with minimal cost increases,\u201d he said.<\/p>\n

The project draws upon expertise across the University and includes collaborator Regina Baucom, associate professor of Ecology and Evolutionary Biology. Students from the fall 2019 semester of MSE489, the Materials Science and Engineering senior capstone design course, will conduct an environmental lifecycle and cost analysis.<\/p>\n

The project grew out of work by graduate student Amy Langhorst, who earned her bachelor\u2019s degree in U-M Materials Science and Engineering in 2013 and took the senior design course with Taub. She now works at Ford Motor Company and is pursuing a doctoral degree with Taub as her advisor.<\/p>\n

The project is part of U-M\u2019s Global CO2 Initiative, which supports development of sustainable and commercially viable carbon-negative technologies. Funding for early-stage, exploratory work is provided through the U-M College of Engineering Blue Sky Initiative, designed to help faculty develop high-risk, high-reward concepts.<\/p>\n

The project has high-reward potential indeed. \u201cWhen we\u2019re successful, we\u2019ll have a CO2<\/sub> negative material,\u201d Taub said. \u201cNot only does using plant fibers prevent CO2<\/sub> emissions during fiber production; our methods also reclaim CO2<\/sub> as the plants grow. We should be able to achieve lighter-weight structures, enabling better fuel economy using materials that are CO2<\/sub> negative. Our challenge is to improve the mechanical properties of the fibers while maintaining low cost.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

Lightening the weight of the machines that move people by land, sea and air is beneficial for many reasons, including improved fuel efficiency and the ability to carry higher payloads or added safety systems. A 10% reduction in the weight of a passenger car, for instance, leads to about a 6% improvement in fuel economy. […]<\/p>\n","protected":false},"author":59,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","nova_meta_subtitle":"","footnotes":""},"categories":[5572],"tags":[7059,11785,11323],"supplier":[12896,5409],"class_list":["post-82901","post","type-post","status-publish","format-standard","hentry","category-bio-based","tag-automotive","tag-composites","tag-naturalfibers","supplier-the-global-co2-initiative","supplier-university-of-michigan"],"_links":{"self":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts\/82901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/users\/59"}],"replies":[{"embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/comments?post=82901"}],"version-history":[{"count":0,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts\/82901\/revisions"}],"wp:attachment":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/media?parent=82901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/categories?post=82901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/tags?post=82901"},{"taxonomy":"supplier","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/supplier?post=82901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}