Synthesis of POSS Derived Organic-Inorganic Hybrid Esters for Insulating Oil Applications

Abstract

In this work, a new family of polyhedral oligomeric silsesquioxanes (POSS) based esters have been synthesized that consists eight ester functional groups. These are classified into Type-I and Type-II esters based on the starting materials, octakis(3-chloropropyl)silsesquioxane (Cl-POSS) and octakis(3-hydroxypropyldimethylsiloxy) octasilsesquioxane (OHPS) respectively. These new POSS type ester moieties can be used as insulating oils and oil additives in the transformers and also considered to be alternatives to mineral and vegetable oils that are presently used in the insulation system.

Development and Performance Evaluation of Eco-Friendly POSS-Containing MQL Oil Coolant for Drilling Processes

“…2019, 9, x FOR PEER REVIEW 3 of 10 POSS-C1CF3 was designed by adding potassium trifluoroacetate, a popular additive for conventional cutting oil, to strengthen the heat resistance. The identification of each compound by 1 H-NMR is shown in Figure 3, and TGA analysis has already been performed for POSS ester [23].…”

“…POSS-C1CF3 was designed by adding potassium trifluoroacetate, a popular additive for conventional cutting oil, to strengthen the heat resistance. The identification of each compound by 1 H-NMR is shown in Figure 3, and TGA analysis has already been performed for POSS ester [23]. The average diameter of a POSS molecule is approximately 0.5 nm, indicating a dense structure, which results in high chemical and thermal stabilities.…”

“…This study, therefore, aimed to develop an eco-friendly POSS-containing MQL oil by designing three kinds of POSS ester compounds with the structural frame of octa-POSS-OH and adding them to conventional MQL-specific oils. Figure 2 shows the process of preparing the octa-chloro-POSS, used as a basic structure for producing the three kinds of POSS ester compounds designed in this study, as described in previous studies [21,23]. After reacting triethoxysilane with HCl and H 2 O for 48 h, di-n-butyltin dilaurate was added to react again for 48 h at room temperature, producing octa-chloro-POSS with a yield of 35%.…”

Monitoring structural evolution of organosilicate species during sol–gel processes by electrospray ionization mass spectrometry

“…Hybrid materials have generated much interest due to their distinct advantages such as increased thermal and chemical stability, high mechanical strength and excellent resistance against oxidation . Polysiloxanes starting from the organosiloxane monomer, (3‐chloropropyl) trimethoxysilane (CPTMS), are building blocks in the construction of novel hybrid materials, which have broad applications in coatings, foams, films and coupling agents . Typically, CPTMS‐derived materials are produced through a traditional sol–gel process under acidic or basic conditions .…”

“…[1][2][3][4][5] Polysiloxanes starting from the organosiloxane monomer, (3-chloropropyl) trimethoxysilane (CPTMS), are building blocks in the construction of novel hybrid materials, which have broad applications in coatings, foams, films and coupling agents. [6][7][8][9][10] Typically, CPTMSderived materials are produced through a traditional sol-gel process under acidic or basic conditions. [11,12] The properties of the resulting polysiloxanes depend on the ratio of water to silane (r), reaction time, and temperature.…”