Mechanical properties of foamed polyurethane solidified ballasted track
High-Speed Railway, 2023 Foamed Polyurethane Solidified Ballasted Track (FPSBT), an innovative railway track, is formed by solidifying ballast bed with foamed polyurethane. Compared with the traditional Discrete Ballasted Track (DBT), FPSBT does not require regular maintenance ...
Yang Xu +3 more
doaj
Journal of Mathematical and Fundamental Sciences, 2013 Degradation of polyurethane sheets using two types of microorganism treatment has been carried out. In this research, the polyurethane sheets were prepared by polyethylene glycol with a molecular weight of 400 and methylene-4,4'-diphenyldiisocyanate at ...
E. Rohaeti +3 more
doaj +1 more source
Copper Replaces Tin: A Copper based Gelling Catalyst for Poly-Urethane from Discarded Motherboard [PDF]
arXiv, 2013 A discarded motherboard based eco-friendly copper catalyst has been programmed to replace the industrially used tin based catalyst DBTDL. The catalyst has been characterized by UV-Vis spectroscopy, FT-IR and TEM. Using the catalyst reaction conditions is optimized and under the optimized condition, both polyurethane and polyurethane foam are prepared ...
arxiv
Synthesis and Characterization of Lignin-Based Polyurethane as a Potential Compatibilizer
Indonesian Journal of Chemistry, 2018 Lignin is one of the most abundant biopolymer on earth. It has polar and non-polar side due to its hyperbranched structure, but the polarity of lignin has a higher tendency than non-polarity.
Salma Ilmiati +4 more
doaj +1 more source
Mechanisms influencing the formation of the carbonized layer relief on the polymer surface after the ion-plasma treatment modeling [PDF]
arXiv, 2017 The work is devoted to modeling of the processes occurring in ion-plasma treatment of polyurethane and forming on its surface a special carbonized layer. The mechanisms affecting the formation of wave-like relief in the carbonized layer are examined. The boundary value problem for the heat equation for modeling the effect of temperature component was ...
arxiv
Pengaruh Jenis Poliol terhadap Pembentukan Poliuretan dari Monomer PEG400 dan MDI
Journal of Mathematical and Fundamental Sciences, 2013 The properties of polyurethane depend largely on building blocks, especially the kind of polyol. Not only pure synthetic compounds but also various natural substances such as saccharides (glucose, fructose, maltose, sucrose) and amylose can be used as ...
Eli Rohaeti +3 more
doaj +1 more source
The influence of electron beam irradiation on the chemical and structural properties of medical grade Polyurethane [PDF]
arXiv, 2015 Thermo plastic polyurethane (TPU) provides excellent bio-compatibility, flexibility and good irradiation resistance; however, extremely high irradiation doses can alter the structure and function of macromolecules, resulting in oxidation, chain scission and cross-linking.
arxiv
Polyurethane-Coated Breast Implants Revisited: A 30-Year Follow-Up
Archives of Plastic Surgery, 2015 Background Polyurethane coating of breast implants has been shown to reduce capsular contracture in short-term follow-up studies. This 30-year study is the longest examination of the use of polyurethane-coated implants and their correlation with ...
Nikki Castel +4 more
doaj +1 more source
Comparison of polyurethane with cyanoacrylate in hemostasis of vascular injury in guinea pigs
Brazilian Journal of Cardiovascular Surgery, 2015 Objective: To evaluate the behavior of castor oil-derived polyurethane as a hemostatic agent and tissue response after abdominal aortic injury and to compare it with 2-octyl-cyanoacrylate. Methods: Twenty-four Guinea Pigs were randomly divided into three
Luiz Fernando Kubrusly +5 more
doaj +1 more source
Nanostructured rigid polyurethane foams with improved specific thermo-mechanical properties using Bacterial Nanocellulose as a Hard Segment [PDF]
arXiv, 2020 Bacterial nanocellulose (BNC) was used to synthesize rigid polyurethane foams (RPUFs) based on its reaction with the isocyanate precursor (ISO route) and also by using the conventional procedure (POL route). The results indicated that at only 0.1 wt. % of BNC, drastic improvements of specific elastic compressive modulus (+244.2 %) and strength (+77.5 %)
arxiv