نتایج جستجو برای: rigid polyether urethane foam
تعداد نتایج: 63518 فیلتر نتایج به سال:
PURPOSE The surgical management of the patients with traumatic sternal fractures remains controversial. The aim of this study was to evaluate the effectiveness of an early surgical reconstruction of a displaced sternal fracture utilizing longitudinal rigid polymer fixation in the settings of an acute chest trauma. METHODS To perform the sternal fixation, we utilized a longitudinal rigid plati...
This article explores the applicability of numerical homogenization techniques for analyzing transport properties in real foam samples mostly open-cell, to understand long-wavelength acoustics of rigid-frame air-saturated porous media, on the basis of microstructural parameters. Experimental characterization of porosity and permeability of real foam samples are used to provide the scaling of a ...
This research focuses on the injury potential of children seated in forward-facing child safety seats during side impact crashes in a near-side seated position. Side impact dynamic sled tests were conducted by NHTSA at Transportation Research Center Inc. (TRC) using a Hybrid III 3-year-old child dummy seated in a convertible forward/rearward child safety seat. The seat was equipped with a LATCH...
A hybrid methodology is used to combine the favorable properties of non-isocyanate polyurethanes (NIPUs) in side chains with poly(methacrylates) as backbone into thermoset resins hydroxyurethane linkages (HNIPU)s. Using NIPUs avoids use toxic isocyanates poly(urethane) segments. The synthesized from cyclic carbonated copolymer templates derived atom transfer radical polymerization (ATRP) an alk...
The literature on rigid polyurethane foam has been reviewed with an emphasis on the gaseous products generated under various thermal decomposition conditions and the toxicity of those products. This review is limited to publications in English through 1984. Carbon monoxide (CO) and hydrogen cyanide (HCN) were the predominant toxicants found among more than a hundred other gaseous products. The ...
BACKGROUND Noncompressible abdominal bleeding is a significant cause of preventable death on the battlefield and in the civilian trauma environment, with no effective therapies available at point of injury. We previously described the development of a percutaneously administered, self-expanding, poly(urea)urethane foam that improved survival in a lethal Grade V hepatic and portal vein injury mo...
The first publication on the use of polyurethane foam (PUF) for sorption processes dates back to 1970, and soon after the material was applied for separation processes. The application of PUF as a sorbent for solid phase extraction of inorganic analytes for separation and pre-concentration purposes is reviewed. The physical and chemical characteristics of PUF (polyether and polyester type) are ...
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