Page 72 - Demo

70 Eyl%u00fcl - September / Ekim - October 2024 Bilimsel / ScientificLi%u00e8ge %u00dcniversitesi'ndeki CERM (Makromolek%u00fcller E%u011fitim ve Ara%u015ft%u0131rma Merkezi) ara%u015ft%u0131rmac%u0131lar%u0131, oda s%u0131cakl%u0131%u011f%u0131ndaki form%u00fclasyonlardan h%u0131zl%u0131 k%u00f6p%u00fcrme teknolojisi kullanarak izosiyanat i%u00e7ermeyen, geri d%u00f6n%u00fc%u015ft%u00fcr%u00fclebilir ve biyobazl%u0131 poli%u00fcretan (PU) k%u00f6p%u00fckler %u00fcretmek i%u00e7in inovatif bir proses geli%u015ftirdi. Bu inovasyon, toksik izosiyanatlara dayal%u0131 geleneksel prosese son teknoloji bir alternatif sunuyor. %u00c7al%u0131%u015fma Journal of the American Chemical Society dergisinde yay%u0131nland%u0131.On y%u0131llard%u0131r toksik izosiyanat kimyas%u0131 ile %u00fcretilen ve %u015fu anda kullan%u0131m%u0131na kat%u0131 k%u0131s%u0131tlamalar getirilen poli%u00fcretan k%u00f6p%u00fckler (PU), g%u00fcnl%u00fck ya%u015fam%u0131m%u0131zda hala temel malzemelerdir. Sert PU k%u00f6p%u00fckler, zeminlerde, duvarlarda ve %u00e7at%u0131larda %u0131s%u0131 yal%u0131t%u0131m panelleri olarak ve ayr%u0131ca buzdolab%u0131 kap%u0131lar%u0131nda kullan%u0131ld%u0131%u011f%u0131nda enerji ihtiyac%u0131m%u0131z%u0131n ciddi %u00f6l%u00e7%u00fcde azalt%u0131lmas%u0131nda %u00f6nemli akt%u00f6rlerdir. Esnek versiyonlar%u0131nda, k%u00f6p%u00fckler %u00e7o%u011funlukla %u015filtelerde, kanepelerde, araba koltuklar%u0131nda ve spor ayakkab%u0131 tabanlar%u0131nda konfor uygulamalar%u0131 i%u00e7in ve ayn%u0131 zamanda akustik yal%u0131t%u0131m veya %u015fok emici malzemeler i%u00e7in kullan%u0131l%u0131r.Halihaz%u0131rda %u00e7e%u015fitli PU geri d%u00f6n%u00fc%u015f%u00fcm stratejileri geli%u015ftiriliyor olsa da, PU k%u00f6p%u00fcklerin kullan%u0131m %u00f6mr%u00fc y%u00f6netimi sorunlu olmaya devam etmektedir. Buna ek olarak, k%u00f6p%u00fck sekt%u00f6r%u00fcn%u00fcn bir%u00e7ok m%u00fc%u015fterisi izosiyanat i%u00e7ermeyen ve ideal olarak biyo-bazl%u0131 malzemeler aramaktad%u0131r. Ara%u015ft%u0131rmac%u0131lar, geri d%u00f6n%u00fc%u015f%u00fcm%u00fc kolay hale getirirken yerel olarak mevcut kaynaklardan yararlanarak k%u00f6p%u00fckleri %u00fcretmek i%u00e7in yo%u011fun bir %u015fekilde alternatifler aramaktad%u0131r. Bu t%u00fcr d%u00f6ng%u00fcsel ve daha s%u00fcrd%u00fcr%u00fclebilir k%u00f6p%u00fcklerin geli%u015ftirilmesi, %u00f6zellikle mevcut end%u00fcstriyel k%u00f6p%u00fck altyap%u0131lar%u0131n%u0131n g%u00fc%u00e7lendirilmesi d%u00fc%u015f%u00fcn%u00fcld%u00fc%u011f%u00fcnde, b%u00fcy%u00fck bir zorluk te%u015fkil etmektedir.CERM'de (Makromolek%u00fcller E%u011fitim ve Ara%u015ft%u0131rma Merkezi) kimyager olarak g%u00f6rev yapan Christophe Detrembleur, %u201c2022 y%u0131l%u0131nda, k%u00f6p%u00fcrt%u00fcc%u00fc madde (CO2)%u00fcretmek i%u00e7in su kullanan, geri d%u00f6n%u00fc%u015ft%u00fcr%u00fclebilir ilk izosiyanat i%u00e7ermeyen poli%u00fcretan k%u00f6p%u00fck (NIPU) %u00fcretim prosesini ba%u015flatt%u0131k.%u201d diyor. %u201cBu teknoloji geleneksel PU'lar%u0131n k%u00f6p%u00fcrmesini taklit eder, ancak toksik izosiyanatlar kullanmaz. Su ve form%u00fclasyona eklenen siklik karbonatlar ve aminlerden olu%u015fan bir kataliz%u00f6r kullan%u0131m%u0131na dayanmaktad%u0131r. Siklik karbonatlar%u0131n bir k%u0131sm%u0131 matrisi geni%u015fleten %u015fi%u015firme maddesine (CO2) d%u00f6n%u00fc%u015f%u00fcrken, di%u011fer k%u0131sm%u0131 da olu%u015fumuna ve sertle%u015fmesine katk%u0131da bulunur.%u201dResearchers from CERM (Center for Education and Research on Macromolecules) at the University of Li%u00e8ge have developed an innovative process for producing isocyanate-free, recyclable and biobased polyurethane (PU) foams by using a rapid foaming technology from room-temperature formulations. This innovation offers a cutting-edge alternative to the traditional process based on toxic isocyanates. The study is published in the Journal of the American Chemical Society.Polyurethane foams (PU), produced for decades by the toxic isocyanate chemistry and currently under strict restrictions on use, are still essential materials in our everyday lives. Rigid PU foams are major actors in the drastic reduction of our energetic needs when used as thermal insulating panels in floors, walls and roofs, as well as in refrigerator doors. In their flexible versions, the foams are mainly used for comfort applications in mattresses, sofas, car seats and soles of sports shoes, but also for acoustic insulation or shock absorbing materials.Although various PU recycling strategies are currently being developed, the end-of-life management of PU foams remains problematic. In addition, many customers of the foam sector are looking for isocyanate-free and ideally bio-based materials. Researchers are intensively searching for alternatives for producing the foams by exploiting locally available resources while rendering them easy to recycle. Developing such circular and more sustainable foams represents a major challenge, especially when the retrofit of existing industrial foaming infrastructures has to be considered.\ 2022, we introduced the first recyclable isocyanate-free polyurethane foam (NIPU) manufacturing process using water to produce the foaming agent (CO2), the simplest and most economical system ever reported,\tophe Detrembleur, chemist at the CERM (Center for Education and Research on Macromolecules). \mimics the foaming of conventional PUs, but without using toxic isocyanates. It is based on the use of water and a catalyst added to the formulation composed of cyclic carbonates and amines. Part of the cyclic carbonates is transformed into the blowing agent (CO2) which expands the matrix, and the other part contributes to its formation and hardening.\Since this foaming process requires a thermal treatment to occur it is very well suited to the manufacture of NIPU foams in heated molds, i.e., for complex-shaped foams (car seats, Ortam s%u0131cakl%u0131%u011f%u0131nda izosiyanat i%u00e7ermeyen, biyobazl%u0131 poli%u00fcretan k%u00f6p%u00fcklerin h%u0131zl%u0131 %u00fcretimiRapid production of isocyanate-free, biobased polyurethane foams at ambient temperature