{"id":251,"date":"2020-12-14T21:37:11","date_gmt":"2020-12-14T21:37:11","guid":{"rendered":"http:\/\/cdmf.org.br\/en\/?p=251"},"modified":"2020-12-14T21:37:13","modified_gmt":"2020-12-14T21:37:13","slug":"industrial-waste-is-reused-to-produce-alternatives-to-plastic","status":"publish","type":"post","link":"https:\/\/cdmf.org.br\/en\/2020\/12\/14\/industrial-waste-is-reused-to-produce-alternatives-to-plastic\/","title":{"rendered":"Industrial Waste Is Reused To Produce Alternatives To Plastic"},"content":{"rendered":"\n

Researchers at S\u00e3o Paulo State University reused bacterial cellulose scraps usually thrown away by manufacturers of wound dressings to make strong biodegradable film for food packaging<\/em><\/p>\n\n\n\n

In Brazil, researchers at S\u00e3o Paulo State University (UNESP) in Ilha Solteira have developed a film that can replace plastic in food packaging. The film is made from hydroxypropyl methylcellulose (HPMC) and bacterial cellulose scraps left over from industrial processing. Both raw materials are sustainable. They are combined to produce a biodegradable film of bacterial cellulose nanocrystals and HPMC.<\/p>\n\n\n\n

The product outperforms film made of HPMC alone. An article on the research project, which was supported by FAPESP<\/strong>, is published<\/strong> in the journal Applied Material & Interfaces<\/em>.<\/p>\n\n\n\n

\u201cWe set out to fill the HMPC matrix with bacterial cellulose nanocrystals in order to enhance its properties. We also wanted to create greener protocols for the development of novel composites, from the material itself to its origin, so we included the reuse of industrial waste in the project,\u201d said M\u00e1rcia Regina de Moura Aouada<\/strong>, a co-author of the article. Aouada has a PhD in chemistry from UNESP, where she teaches and is a researcher at the Center for Development of Functional Materials (CDMF<\/strong>), one of the Research, Innovation and Dissemination Centers (RIDCs<\/strong>) supported by FAPESP.<\/p>\n\n\n\n

Since her PhD, Aouada has studied films made from renewables, and edible and biodegradable films, with the aim of reducing the growing generation of solid waste in the form of dumped plastic food packaging.<\/p>\n\n\n\n

\u201cOne of the limitations of films made of HPMC and other biopolymers is their low mechanical strength compared with traditional films derived from petroleum. They are also highly permeable to water vapor, which limits the available applications. We improved these properties by adding bacterial cellulose,\u201d said Pamela Melo, a graduate student in material sciences at UNESP and first author of the article on the project, which was conducted during her PhD research under Aouada\u2019s supervision.<\/p>\n\n\n\n

Cake recipe<\/strong><\/p>\n\n\n\n

The researchers obtained bacterial cellulose scraps from Seven Ind\u00fastria de Produtos Biotecnol\u00f3gicos, which makes wound dressing biofilms in the state of Paran\u00e1. To convert this waste into film suitable for food packaging, they first milled the scraps into powder. \u201cWe then submitted the powder to sulfuric acid hydrolysis, a process well described in the literature,\u201d Melo said. The result was a bacterial cellulose nanocrystal suspension, which they mixed with HPMC diluted in water to produce a film-forming dispersion, a target of interest for the bioplastics industry.<\/p>\n\n\n\n

\u201cIt\u2019s not enough to create good composites. We need to find the best solution to obtain good film properties by varying factors such as viscosity and nanoparticle concentration. A fair analogy could be a cake recipe: studying the recipe is another significant innovation in our study,\u201d Aouada said.<\/p>\n\n\n\n

\u201cHow the nanocrystals interact with the HPMC matrix and are distributed within it will determine film quality, so we conducted tests and arrived at the optimal distribution via high-energy dispersion using a Turrax disperser,\u201d Melo said. The film-forming dispersion was deposited on a substrate. The solvents evaporated after 24-48 hours. The result was a stronger, less permeable product than HPMC-only film. The amount of water absorbed by the material is currently a constraint on its use in packaging.<\/p>\n\n\n\n

Another positive finding is that the nanocrystals do not alter the transparency of HPMC.<\/p>\n\n\n\n

Advantages of bacterial cellulose<\/strong><\/p>\n\n\n\n

Cellulose is the most abundant polymer in nature and the main component of vegetable fibers, providing rigidity for plants. Plant cellulose is well-known and used in the manufacturing of paper, but some bacteria, algae and marine invertebrates also secrete cellulose, which has been used for some time in wound dressing biofilms and is now expanding into other areas, such as food packaging (read more at: revistapesquisa.fapesp.br\/en\/cellulose-on-the-skin<\/strong><\/em>).<\/p>\n\n\n\n

Protection of the natural environment benefits most. \u201cBacterial cellulose can be produced in the laboratory all year round, regardless of weather and environmental conditions. It\u2019s a purer molecule and the production process generates less pollution,\u201d Aouada said. Processing of plant cellulose requires the elimination of impurities such as lignin using organochlorine compounds, which are harmful to the environment.<\/p>\n\n\n\n

Another advantage of bacterial cellulose is the presence of nanometric fibers in its structure. \u201cThis is very interesting because it gives the material distinct properties such as high tensile strength, meaning it can withstand certain loads or stresses without breaking,\u201d Aouada said.<\/p>\n\n\n\n

Next steps<\/strong><\/p>\n\n\n\n

The researchers plan to continue testing film-forming dispersions until they conclude they have developed a competitive product. They are studying other polymer dispersion techniques, comparing them with the use of HPMC, and assessing their biodegradability.<\/p>\n\n\n\n

If they succeed in developing better film-forming dispersions, it may be possible to use bacterial cellulose on a larger scale. \u201cOur main focus is on finding substitutes for materials not considered ecologically correct, such as petroleum products. Such substitutes include biodegradable composites derived from renewable resources,\u201d Aouada said.<\/p>\n\n\n\n

The use of cellulose scraps and other kinds of waste also helps reduce processing cost. Consumers typically prefer plastic film for packaging because it is cheap. Moreover, there are other promising sources of bacterial cellulose, such as the sugarcane and soy industries. \u201cStudies have shown that bacterial cellulose can be obtained using sugarcane or soy molasses as a substrate,\u201d Aouada said.<\/p>\n\n\n\n

First on SCIENMAG<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Researchers at S\u00e3o Paulo State University reused bacterial cellulose scraps usually thrown away by manufacturers of wound dressings to make strong biodegradable film for food packaging In Brazil, researchers at S\u00e3o Paulo State University (UNESP) […]<\/a><\/p>\n<\/div>","protected":false},"author":3,"featured_media":252,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[11,9],"tags":[17,18,19,40],"class_list":{"0":"post-251","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-featured","8":"category-news","9":"tag-cdmf","10":"tag-cepid","11":"tag-fapesp","12":"tag-unesp"},"yoast_head":"\nIndustrial Waste Is Reused To Produce Alternatives To Plastic - Functional Materials Development Center<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cdmf.org.br\/en\/2020\/12\/14\/industrial-waste-is-reused-to-produce-alternatives-to-plastic\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Industrial Waste Is Reused To Produce Alternatives To Plastic - 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