Tryznowski Mariusz, Gołofit Tomasz, Gürgen Selim, Kręcisz Patrycja, Chmielewski Marcin
Faculty of Mechanical and Industrial Engineering, Warsaw University of Technology, Narbutta 85, 02-524 Warsaw, Poland.
Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
Materials (Basel). 2022 Aug 24;15(17):5818. doi: 10.3390/ma15175818.
This study aimed to analyze the influence of the thermal treatment of shear thickening fluids, STFs, on their viscosity. For this purpose, shear thickening fluids based on polypropylene glycols PPG400 and PPG1000 and Aerosil200 were developed. The shear thickening behavior of obtained fluids was confirmed by using a parallel-plate rheometer. Next, thermogravimetric (TG) analyses were used to characterized thermal stability and weight loss of the STFs at a constant temperature. Finally, the thermal treatment of the STFs obtained was provided using the apparatus developed for this purpose. The received STFs exhibited a very high maximum viscosity up to 15 kPa. The rheology of the STFs measured after thermal treatment indicated that the proposed method allowed the development of STFs with a very high maximum viscosity. The maximum viscosity of the STFs increased twofold when thermal treatment of the STFs at elevated temperature for 210 min was performed. TG confirmed the convergence of the weight loss in the apparatus. Our results show that controlling the thermal treatment of STFs allows STFs to be obtained with high viscosity and a dilatation jump of the STFs by degradation of the liquid matrix.
本研究旨在分析剪切增稠流体（STF）的热处理对其粘度的影响。为此，开发了基于聚丙二醇PPG400和PPG1000以及气相二氧化硅Aerosil200的剪切增稠流体。使用平行板流变仪确认了所得流体的剪切增稠行为。接下来，采用热重（TG）分析来表征STF在恒定温度下的热稳定性和重量损失。最后，使用为此目的开发的设备对所得的STF进行热处理。所得到的STF表现出高达15 kPa的非常高的最大粘度。热处理后测量的STF的流变学表明，所提出的方法能够开发出具有非常高的最大粘度的STF。当在高温下对STF进行210分钟的热处理时，STF的最大粘度增加了两倍。TG证实了设备中重量损失的趋同性。我们的结果表明，控制STF的热处理能够获得具有高粘度的STF，并且通过液体基质的降解使STF出现膨胀突变。
