{"id":6933,"date":"2023-09-07T17:29:00","date_gmt":"2023-09-07T21:29:00","guid":{"rendered":"https:\/\/new.www.purdue.edu\/newsroom\/?p=6933"},"modified":"2024-08-20T12:40:15","modified_gmt":"2024-08-20T16:40:15","slug":"new-bio-based-glues-from-purdue-form-adhesive-bonds-that-grow-stronger-in-water","status":"publish","type":"post","link":"https:\/\/www.purdue.edu\/newsroom\/2023\/Q3\/new-bio-based-glues-from-purdue-form-adhesive-bonds-that-grow-stronger-in-water","title":{"rendered":"New bio-based glues from Purdue form adhesive bonds that grow stronger in water"},"content":{"rendered":"

WEST LAFAYETTE, Ind. —<\/p> \n

Patent-pending adhesive formulations developed at Purdue University from fully sustainable, bio-based components establish bonds that grow stronger when underwater or exposed to wet conditions.<\/p>\n<\/div>\n\n\n

Gudrun Schmidt<\/a>, an associate professor of practice in Purdue\u2019s Department of Chemistry<\/a>, and a team of researchers developed the formulations from zein, a protein found in corn, and tannic acid. A paper about the team\u2019s research was published in the peer-reviewed journal ACS Applied Materials & Interfaces<\/a>.<\/p>\n\n\n\n

The adhesive formulations could be further developed and used in the restoration of coral reefs and have applications in the construction, manufacturing, biomedical, dental, food and cosmetic industries.<\/p>\n\n\n\n

Stronger in water<\/strong><\/h2>\n\n\n\n

Schmidt and her colleagues conducted underwater adhesive experiments on their formulations, using different surfaces and different waters, including seawater, saline solution, tap water and deionized water.<\/p>\n\n\n\n

\u201cInterestingly, the water type does not influence performance a great deal, but the substrate type does,\u201d Schmidt said. \u201cAn additional unexpected result was bond strengths increasing over time when exposed to water, contradicting general experiments of working with traditional, petroleum-based glues. Initial adhesion underwater was stronger compared to benchtop adhesion, suggesting that water helps to make the glue stick underwater.\u201d<\/p>\n\n\n\n

Protective skin formed on the surface of the adhesives when placed underwater, which kept water from entering the rest of the material immediately.<\/p>\n\n\n\n

\u201cBut once the skin was in place, it could be broken to induce faster bond formation,\u201d Schmidt said.<\/p>\n\n\n\n

The experiments also indicated maximum bonding at about 30 degrees Celsius, then another increase at higher temperatures.<\/p>\n\n\n\n

Schmidt said the process to make the adhesive formulations is a short one.<\/p>\n\n\n\n

\u201cWe can use inexpensive, sustainably sourced, plant-based materials to make gallons of glue within hours,\u201d Schmidt said. \u201cThe adhesives are very simple to make in the lab or outdoors, everywhere on the planet.\u201d<\/p>\n\n\n\n

The demand for nontoxic formulations<\/strong><\/h2>\n\n\n\n

Schmidt said other researchers are formulating adhesives that mimic the glues used by mussels, barnacles, oysters and sandcastle worms to adhere to the seafloor and other wet surfaces. Those best-performing formulations, however, are fully synthetic.<\/p>\n\n\n\n

\u201cLengthy syntheses with the use of harsh chemicals may hold back their future development,\u201d Schmidt said. \u201cNontoxicity, sustainably sourced materials and minimal environmental impact are increasingly in demand. Consequently, several groups have turned to developing new and remaking old adhesive systems using bioinspired or bio-based chemistry.\u201d<\/p>\n\n\n\n

The increased demand of nontoxic materials has led to creating adhesives for biomedical applications. The resulting glues have properties similar to soft tissue. Schmidt said that bio-based adhesives have further applications.<\/p>\n\n\n\n

\u201cOnce the in vivo and biomedical realm is left behind, there is an entire world of other applications requiring metals, plastics, wood and inorganic substrates that need adhesives to work in the presence of water,\u201d Schmidt said. \u201cFood, oral and cosmetic applications are less restrictive when it comes to purity of starting materials. Food-grade polymers can often be used for making wet adhesives. We also are working on dental applications, trying to make bonds in this wet and challenging environment.\u201d<\/p>\n\n\n\n

Coral reef restoration<\/strong> <\/h2>\n\n\n\n

Schmidt said another particularly intriguing application for the patent-pending Purdue-developed adhesive formulations is the restoration of coral reefs.<\/p>\n\n\n\n

\u201cThere are several major efforts, worldwide, planting young corals to replace those structures that are already dead,\u201d Schmidt said. \u201cA major hindrance to these efforts is lack of suitable underwater adhesives that work well for this application.\u201d<\/p>\n\n\n\n

Schmidt and her research team are working with the Coral Restoration Foundation<\/a>, sending various formulations to be tested.<\/p>\n\n\n\n

\u201cWe recently visited the Florida Keys to test a few formulations in bucketsful of ocean water,\u201d Schmidt said. \u201cIt is great to see our work outside of the research lab and in the real, wet world.\u201d<\/p>\n\n\n\n

The Coral Restoration Foundation constantly searches for the most efficient and effective method of outplanting coral onto reef sites, said Phanor H. Montoya-Maya, coral restoration program manager at CRF.<\/p>\n\n\n\n

\u201cHaving different alternatives means different species and habitats can be outplanted with positive results,\u201d Montoya-Maya said. \u201cScience collaborations like this allow us to test and fine-tune methods before mainstream restoration. Field preliminary results are very encouraging, and we’ll continue to provide feedback to Purdue researchers to ensure the final product is consistently successful across multiple restoration goals.\u201d<\/p>\n\n\n\n

Schmidt disclosed the adhesive formulations to the Purdue Innovates Office of Technology Commercialization<\/a>, which has applied for a patent to protect the intellectual property.<\/p>\n\n\n\n

About Purdue University<\/strong><\/h2>\n\n\n\n

Purdue University is a public research institution with excellence at scale. Ranked among top 10 public universities and with two colleges in the top 4 in the United States, Purdue discovers and disseminates knowledge with a quality and at a scale second to none. More than 105,000 students study at Purdue across modalities and locations, with 50,000 in person on the West Lafayette campus. Committed to affordability and accessibility, Purdue\u2019s main campus has frozen tuition 12 years in a row. See how Purdue never stops in the persistent pursuit of the next giant leap, including its first comprehensive urban campus in Indianapolis, the new Mitchell E. Daniels, Jr. School of Business, and Purdue Computes, at https:\/\/www.purdue.edu\/president\/strategic-initiatives<\/a>.<\/p>\n\n\n\n

About Purdue Innovates Office of Technology Commercialization<\/strong><\/h2>\n\n\n\n

The\u00a0Purdue Innovates Office of Technology Commercialization<\/a>\u00a0operates one of the most comprehensive technology transfer programs among leading research universities in the U.S. Services provided by this office support the economic development initiatives of Purdue University and benefit the university\u2019s academic activities through commercializing, licensing and protecting Purdue intellectual property. In fiscal year 2022, the office reported 157 deals finalized with 237 technologies signed, 379 disclosures received and 169 issued U.S. patents. The office is managed by the Purdue Research Foundation, which received the 2019 Innovation and Economic Prosperity Universities Award for Place from the Association of Public and Land-grant Universities. In 2020, IPWatchdog Institute ranked Purdue third nationally in startup creation and in the top 20 for patents. The Purdue Research Foundation is a private, nonprofit foundation created to advance the mission of Purdue University. Contact\u00a0otcip@prf.org<\/a>\u00a0for more information.<\/p>\n\n\n

\n
\n
\n

\n Writer\/Media contact:<\/strong>\u00a0Steve Martin,\u00a0sgmartin@prf.org<\/a>
Sources:<\/strong>\u00a0Gudrun Schmidt,\u00a0gudrun@purdue.edu<\/a>
Phanor\u00a0H. Montoya-Maya,\u00a0phanor@coralrestoration.org<\/a> <\/p>\n <\/div>\n <\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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