{"id":120591,"date":"2023-01-10T07:29:00","date_gmt":"2023-01-10T06:29:00","guid":{"rendered":"https:\/\/renewable-carbon.eu\/news\/?p=120591"},"modified":"2023-01-05T14:44:29","modified_gmt":"2023-01-05T13:44:29","slug":"strong-and-biodegradable","status":"publish","type":"post","link":"https:\/\/renewable-carbon.eu\/news\/strong-and-biodegradable\/","title":{"rendered":"Strong and biodegradable"},"content":{"rendered":"\n

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How can plastics be designed so they retain their desirable properties but at the same time can be more effectively recycled? This and other questions concerning the eco-friendliness of plastics are the focus of chemist Stefan Mecking and his research group at the University of Konstanz. In their\u00a0latest paper<\/a>\u00a0in the international edition of Angewandte Chemie<\/em>, the team presents a new polyester which exhibits material properties that are attractive for industry while being environmentally friendly.<\/strong><\/p>\n\n\n\n

Normally hardly compatible<\/strong><\/h3>\n\n\n\n

Plastics are made of long chains of one or several chemical basic modules, so-called monomers. Plastics distinguished by high crystallinity and water repellency, therefore mechanically highly resilient and stable, are widely used. A well-known example is high density polyethylene (HDPE), whose basic modules consist of non-polar hydrocarbon molecules. What may on the one side be advantageous properties for applications can also have adverse effects: It is very energy intensive and inefficient to recycle such plastics and recover the basic modules. Also, if such plastics leak into the environment, the degradation process is extremely long.<\/p>\n\n\n\n

To overcome this supposed incompatibility between the stability and biodegradability of plastics, Mecking and his team insert chemical \u201cbreaking points\u201d in their materials. They already showed that this greatly improves the\u00a0recyclability of polyethylene-like plastics<\/a>. However, good biodegradability is not automatically guaranteed. <\/p>\n\n\n\n

\u201cPlastics often gain high resilience because they are ordered in densely packed crystalline structures,\u201d Mecking<\/strong> explains: \u201cCrystallinity in combination with water repellency usually strongly decelerates the biodegradation process, as it impairs the microorganisms\u2018 access to the breaking points.\u201d <\/p><\/blockquote>\n\n\n\n

However, this does not apply to the researchers\u2019 new plastic.<\/p>\n\n\n\n

Crystalline and yet compostable\u00a0<\/strong><\/h3>\n\n\n\n

The new plastic, polyester-2,18, consists of two basic modules: a short diol unit with two carbon atoms and a dicarboxylic acid with 18 carbon atoms. Both modules can be easily obtained from sustainable sources. For example, the starting material for the dicarboxylic acid, which is the plastic\u2019s main component, comes from a renewable source. The polyester\u2019s properties resemble those of HDPE: due to its crystalline structure, for example, it exhibits both mechanical stability and temperature resistance. At the same time, first experiments for recyclability showed that under comparatively mild conditions, this material\u2019s basic modules can be recovered.\u00a0<\/p>\n\n\n\n

The new plastic also has another, quite unexpected property: in spite of its high crystallinity it is biodegradable, as lab experiments with natural enzymes and tests at an industrial composting plant showed. Within a few days, in a lab experiment the polyester was degraded by enzymes. The composting plant\u2019s microorganisms required about two months, so this plastic even meets ISO-composting standards. <\/p>\n\n\n\n

\u201cWe too were amazed by this rapid degradation,\u201d says Mecking<\/strong>, who adds: \u201cOf course we cannot transfer the results of the composting plant one-to-one into any conceivable environmental condition. But they do confirm that this material is indeed biodegradable and indicate that it is much less persistent than plastics like HDPE, if it should unintentionally be released into the environment.\u201d<\/p><\/blockquote>\n\n\n\n

Both the recyclability of this polyester and its biodegradability under variable environmental conditions are now to be studied further. Mecking sees possible applications for this new material, e.g. in 3D-printing or in the production of packing foils. In addition, there are further areas of interest, in which it is desirable to combine crystallinity with recyclability and the degradation of abraded particles or similar loss of material.<\/p>\n\n\n\n

Original publication<\/h3>\n\n\n\n

Marcel Eck et al. (2022) Biodegradable high density polyethylene-like material. Angewandte Chemie International Edition; DOI:\u00a0https:\/\/doi.org\/10.1002\/ange.202213438<\/a><\/em><\/strong><\/p>\n\n\n\n

Key facts:<\/strong><\/h3>\n\n\n\n
  • Researchers at the University of Konstanz develop new plastic which is highly stable, biodegradable and readily recyclable.<\/li>
  • Stefan Mecking is professor of chemical materials science in the Department of Chemistry at the University of Konstanz. With his team, he does research on catalysis, with the aim of improving the environmental friendliness of plastics.<\/li>
  • Funding: An ERC Advanced Grant for the project DEEPCAT (Degradable Polyolefin Materials Enabled by Catalytic Methods).<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"

    How can plastics be designed so they retain their desirable properties but at the same time can be more effectively recycled? This and other questions concerning the eco-friendliness of plastics are the focus of chemist Stefan Mecking and his research group at the University of Konstanz. In their\u00a0latest paper\u00a0in the international edition of Angewandte Chemie, […]<\/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":"none","nova_meta_subtitle":"A polyester plastic of great mechanical stability, which is also easily recyclable and even compostable: Stefan Mecking, chemist at the University of Konstanz, and his research group present a new material","footnotes":""},"categories":[5572,17143],"tags":[11270,10416,12239,11966,15212,10453],"supplier":[1442],"class_list":["post-120591","post","type-post","status-publish","format-standard","hentry","category-bio-based","category-recycling","tag-biodegradability","tag-circulareconomy","tag-compostability","tag-plastics","tag-polyester","tag-recycling","supplier-universitaet-konstanz"],"_links":{"self":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts\/120591","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=120591"}],"version-history":[{"count":0,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts\/120591\/revisions"}],"wp:attachment":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/media?parent=120591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/categories?post=120591"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/tags?post=120591"},{"taxonomy":"supplier","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/supplier?post=120591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}