The obtained material was characterized by Fourier transform infrared spectroscopy, dynamic mechanical analysis and scanning electron microscopy. Association of absorbed plasticizers with polyurethane components by polarity was demonstrated in the results by the shifting of the appropriate hard and soft block loss tangent peak.įluorosilicone polyether polyurethane (FSPU) was successfully prepared from polytetramethylene glycol, hydroxyl fluorosilicone oil, toluene diisocyanate and chain extender 2,4-diamino-3,5-dimethylthiotoluene. In this first stage of the research, a temperature range from −100 to 100 ☌ and samples saturated with fluid were explored by DMA to determine the limiting behavior of the samples, enabling more detailed investigation in future work. This material characteristic is under investigation using dynamic mechanical analysis (DMA) to assess its dependence on the plasticizer and polyurethane component chemistry.
However, the temperature and frequency location of this peak can shift in response to absorbed plasticizing fluids. Damping behavior is characterized by a peak in the loss tangent. For acoustic clarity and sensitivity, it is important that the elastomer operates well outside damping conditions as dictated by the temperatures and frequencies of interest.
U.s. navy underwater sound reference laboratory orlando windows#
Acoustically transparent elastomers are the windows through which the United States Navy views the ocean.
0 kommentar(er)
