{"id":45753,"date":"2017-09-12T07:23:40","date_gmt":"2017-09-12T05:23:40","guid":{"rendered":"https:\/\/renewable-carbon.eu\/news\/?p=45753"},"modified":"2017-09-08T13:38:15","modified_gmt":"2017-09-08T11:38:15","slug":"huskers-bring-the-heat-to-improve-biodegradable-plastics","status":"publish","type":"post","link":"https:\/\/renewable-carbon.eu\/news\/huskers-bring-the-heat-to-improve-biodegradable-plastics\/","title":{"rendered":"Huskers bring the heat to improve biodegradable plastics"},"content":{"rendered":"

Introducing a simple step to the production of plant-derived, biodegradable plastic could improve its properties while overcoming obstacles to manufacturing it commercially, says new research<\/a> from the University of Nebraska-Lincoln and Jiangnan University.<\/strong><\/p>\n

That step? Bringing the heat.<\/h3>\n

Nebraska\u2019s Yiqi Yang and colleagues found that raising the temperature of bio-plastic fibers to several hundred degrees Fahrenheit, then slowly allowing them to cool, greatly improved the bio-plastic\u2019s normally lackluster resistance to heat and moisture.<\/p>\n

Its thermal approach also allowed the team to bypass solvents and other expensive, time-consuming techniques typically needed to manufacture a commercially viable bio-plastic, the study reported.<\/p>\n

Yang said the approach could allow manufacturers of corn-derived plastic \u2013 such as a Cargill plant in Blair \u2013 to continuously produce the biodegradable material on a scale that at least approaches petroleum-based plastic, the industry standard. Recent research estimates that about 90 percent of U.S. plastic goes unrecycled.<\/p>\n

\u201cThis clean technology makes possible (the) industrial-scale production of commercializable bio-based plastics,\u201d the authors reported.<\/p>\n

\"170830_Yang_037
Craig Chandler | University Communication<\/figcaption><\/figure>\n

Not easy being green<\/h3>\n

The approach uses polylactic acid, or polylactide, a component of biodegradable plastic that can be fermented from corn starch, sugarcane and other plants. Though most plastics are made from petroleum, polylactide has emerged as an environmentally friendlier alternative.<\/p>\n

Yet polylactide\u2019s susceptibility to heat and moisture, particularly during the manufacturing process, has limited its use in textiles and other industries. In searching for ways to address the issue, researchers long ago discovered that mixing mirror-image polylactide molecules \u2013 generally referred to as \u201cL\u201d and \u201cD\u201d \u2013 could yield stronger molecular interactions and better performance than using just the L or D alone.<\/p>\n

But there was another catch. Convincing a reasonable proportion of the L and D molecules to permanently pair up is difficult, often forcing researchers to concoct costly and complicated matchmaking schemes. Some of the most common involve the use of solvents or other chemical agents whose disposal can cause environmental issues of their own.<\/p>\n

\u201cThe problem is that people couldn\u2019t find a way to make it work so that you could use it on large scales,\u201d said Yang, Charles Bessey Professor of biological systems engineering and of textiles, merchandising and fashion design. \u201cPeople use nasty solvent or other additives. But those are not good for continuous production.<\/p>\n

\u201cWe don\u2019t want to dissolve the polymers and then try to evaporate the solvents, and then have to consider reusing them. That\u2019s just too expensive (and) not realistic.\u201d<\/p>\n

Heating up<\/h3>\n

Yang and his colleagues decided to pursue another approach. After mixing pellets of the L and D polylactide and spinning them into fibers, the team rapidly heated them to as hot as 400 degrees Fahrenheit.<\/p>\n

The resulting bio-plastic resisted melting at temperatures more than 100 degrees higher than did plastics containing only the L or D molecules. It also maintained its structural integrity and tensile strength after being submersed in water at more than 250 degrees, approximating the conditions that bio-plastics must endure when being incorporated into dyed textiles.<\/p>\n

\"Collage_2\"
Conventionally prepared bioplastic fibers before (top left) and after (bottom left) being exposed to moisture, as compared with thermally treated fibers before (near right) and after (far right) the same process. (Chemical Engineering Journal \/ Yiqi Yang)<\/figcaption><\/figure>\n

 <\/p>\n

The textile industry produces about 100 million tons of fibers annually, Yang said, meaning that a feasible green alternative to petroleum-based manufacturing could pay off both environmentally and financially.<\/p>\n

\u201cSo we just used a cheap way that can be applied continuously, which is a big part of the equation,\u201d Yang said. \u201cYou have to be able to do it continuously in order to have large-scale production. Those are important factors.\u201d<\/p>\n

Though the team has demonstrated continuous production on a smaller scale in Yang\u2019s lab, he said it will soon ramp up to further illustrate how the approach might be integrated into existing industrial processes.<\/p>\n

 <\/p>\n

The team\u2019s findings will be published in a November print edition of Chemical Engineering Journal. Yang authored the study with Helan Xu, a former Nebraska researcher now at Jiangnan University; Bingnan Mu, graduate student in textiles, merchandising and fashion design at Nebraska; and Jiangnan University\u2019s Gangwei Pan, Bomou Ma and Jing Yang.<\/p>\n

The researchers received support from the U.S. Department of Agriculture\u2019s National Institute of Food and Agriculture, the Agricultural Research Division at the University of Nebraska-Lincoln, and the China Scholarship Council.<\/p>\n","protected":false},"excerpt":{"rendered":"

Introducing a simple step to the production of plant-derived, biodegradable plastic could improve its properties while overcoming obstacles to manufacturing it commercially, says new research from the University of Nebraska-Lincoln and Jiangnan University. That step? Bringing the heat. Nebraska\u2019s Yiqi Yang and colleagues found that raising the temperature of bio-plastic fibers to several hundred degrees […]<\/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":[11270,5847],"supplier":[5691,1072],"class_list":["post-45753","post","type-post","status-publish","format-standard","hentry","category-bio-based","tag-biodegradability","tag-bioplastics","supplier-jiangnan-university","supplier-university-of-nebraskalincoln"],"_links":{"self":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts\/45753","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=45753"}],"version-history":[{"count":0,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/posts\/45753\/revisions"}],"wp:attachment":[{"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/media?parent=45753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/categories?post=45753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/tags?post=45753"},{"taxonomy":"supplier","embeddable":true,"href":"https:\/\/renewable-carbon.eu\/news\/wp-json\/wp\/v2\/supplier?post=45753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}