Unexpected Method of High-Viscosity Shear Thickening Fluids Based on Polypropylene Glycols Development via Thermal Treatment

Mariusz Tryznowski; Tomasz Gołofit; Selim Gürgen; Patrycja Kręcisz; Marcin Chmielewski

doi:10.3390/ma15175818

Unexpected Method of High-Viscosity Shear Thickening Fluids Based on Polypropylene Glycols Development via Thermal Treatment

Materials (Basel). 2022 Aug 24;15(17):5818. doi: 10.3390/ma15175818.

Authors

Mariusz Tryznowski¹, Tomasz Gołofit², Selim Gürgen³, Patrycja Kręcisz⁴, Marcin Chmielewski^{5

6}

Affiliations

¹ Faculty of Mechanical and Industrial Engineering, Warsaw University of Technology, Narbutta 85, 02-524 Warsaw, Poland.
² Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
³ Department of Aeronautical Engineering, Eskişehir Osmangazi University, Eskişehir 26040, Turkey.
⁴ Faculty of Material Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland.
⁵ Institute of Microelectronics and Photonics, Łukasiewicz Research Network, Lotników 32/46, 02-668 Warsaw, Poland.
⁶ National Centre for Nuclear Research, Materials Research Lab, Świerk, 05-400 Otwock, Poland.

Abstract

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 Aerosil^®200 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.

Keywords: composite; shear thickening fluids; thermal treatment; viscosity.

Grants and funding

Research was funded by POB Technologie Materiałowe of Warsaw University of Technology within the Excellence Initiative: Research University (IDUB) program.