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Bilimsel / Scientific66 Eyl%u00fcl - September / Ekim - October 2024 %u00c7in'deki Zhejiang %u00dcniversitesi'nde kimya m%u00fchendislerinden olu%u015fan bir ekip, poli%u00fcretan k%u00f6p%u00fckleri 3D bask%u0131 re%u00e7inelerine d%u00f6n%u00fc%u015ft%u00fcrmenin bir yolunu geli%u015ftirdi. Nature Chemistry dergisinde yay%u0131nlanan makalelerinde grup, geli%u015ftirdikleri tekni%u011fi ve re%u00e7inelerin kullan%u0131labilece%u011fi olas%u0131 yollar%u0131 anlat%u0131yor.Araba koltuklar%u0131, kanepeler ve %u015filtelerin i%u00e7inde bulunan poli%u00fcretan k%u00f6p%u00fckler (k%u00f6p%u00fck kau%u00e7uk olarak da bilinir), %u00fcr%u00fcnleri daha konforlu hale getirmek i%u00e7in kullan%u0131l%u0131r. Bunlar asl%u0131nda bir %u015fi%u015firme ajan%u0131 kullan%u0131larak gaz kabarc%u0131klar%u0131n%u0131n kar%u0131%u015f%u0131mlara itilmesiyle genle%u015fmesi sa%u011flanan bir plastik t%u00fcr%u00fcd%u00fcr. Bu t%u00fcr k%u00f6p%u00fcklerin, yap%u0131m%u0131nda kullan%u0131lan k%u00fcrleme i%u015flemi nedeniyle geri d%u00f6n%u00fc%u015ft%u00fcr%u00fclmesinin zor oldu%u011fu bilinmektedir.Ara%u015ft%u0131rmac%u0131lar%u0131n da belirtti%u011fi gibi, mevcut yakla%u015f%u0131mlar ekonomik a%u00e7%u0131dan cazip de%u011fildir ve ayn%u0131 zamanda vasat%u0131n alt%u0131nda yan %u00fcr%u00fcnlerin %u00fcretilmesine yol a%u00e7maktad%u0131r. Bu nedenle bu t%u00fcr %u00fcr%u00fcnlerin b%u00fcy%u00fck k%u0131sm%u0131 %u00e7%u00f6pl%u00fckte son bulmaktad%u0131r. Bu yeni %u00e7al%u0131%u015fmada, %u00c7in'deki ekip bu t%u00fcr malzemelerin geri d%u00f6n%u00fc%u015f%u00fcm%u00fc i%u00e7in hem ucuz hem de %u00f6l%u00e7eklenebilir oldu%u011funu iddia ettikleri yeni bir yakla%u015f%u0131m geli%u015ftirdi. Bunu, genel olarak at%u0131lan malzemelerin y%u00fcksek de%u011ferli %u00fcr%u00fcnlere d%u00f6n%u00fc%u015ft%u00fcr%u00fcld%u00fc%u011f%u00fc bir kimyasal ileri d%u00f6n%u00fc%u015f%u00fcm %u00f6rne%u011fi olarak tan%u0131ml%u0131yorlar.A team of chemical engineers at Zhejiang University, in China, has developed a way to convert polyurethane foams to 3D printing resins. In their paper published in the journal Nature Chemistry, the group describes their technique and possible ways the resins could be used.Polyurethane foams (also known as foam rubber) of the types that are found inside of car seats, couches and mattresses are used to make products more comfortable. They are actually a type of plastic that is made to expand by forcing gas bubbles into mixtures using a blowing agent. Such foams are notoriously difficult to recycle because of the curing process that is used to make them.Current approaches, as the researchers note, tend to be economically unattractive and also lead to the production of subpar byproducts. Because of that, most such products wind up in a landfill. In this new effort, the team in China has developed a novel approach to recycling such materials%u2014one that they claim is both inexpensive and scalable. They describe it as an example of chemical upcycling, where typically discarded materials are converted to high-value products.The new approach involves what the researchers describe as a fragmentation and reconstruction approach. It inPoli%u00fcretan k%u00f6p%u00fcklerin 3D bask%u0131 re%u00e7inelerine d%u00f6n%u00fc%u015ft%u00fcr%u00fclmesiConverting polyurethane foams to 3D printing resins