Improving Thermal Stability of Polyurethane through the Addition of Hyperbranched Polysiloxane

Abstract

Polydimethylsiloxane with hydroxy groups was functionalized to form functionalized polydimethylsiloxane, which subsequently underwent an addition reaction with isophorone diisocyanate to form the prepolymer. Next, 3-aminopropyltriethoxysilane (APTS) reacted with 3-glycidoxypropyltrimethoxysilane (GPTS) to produce bridged polysilsesquioxanes, and sol-gel technology was employed to form hyperbranched polysiloxane nanoparticles with hydroxy groups, APTS-GPTS, which was used as the additive. The hyperbranched polysiloxane and the prepolymer containing NCO functional groups then underwent an addition reaction to produce the hybrid materials. Fourier-transform infrared spectroscopy and 29Si nuclear magnetic resonance were used to characterize the structure of the polyurethane hybrid. Regarding thermal stability, after the hyperbranched polysiloxane nanoparticles was introduced, the integral procedural decomposition temperature increased from 348 °C for polyurethane matrix to 859 °C for the hybrid material. The results reveal that the thermal stability of the hybrid material substantially increased by approximately 247%.

Acrylated soybean oil: a key intermediate for more sustainable elastomeric materials from silicones

“…For example, simple polyurethanes, depending on structure, undergo thermal decomposition (TGA) starting well below 400 °C, 26 while silicone polyurethane copolymers begin to decompose well above 400 °C. 27,28 That thermal stabilizing effect is similarly exhibited with the silicone/soybean copolymers (Fig. S7, ESI†), which start decomposition at much higher temperatures than pure organic polymers.…”

Enhancing Thermo-Mechanical Properties of Epoxy Composites Using Fumed Silica with Different Surface Treatment

“…The integral procedural decomposition temperature (IPDT), proposed by Doyle, is related to the volatile fraction of polymers and can be utilized to estimate the overall intrinsic thermal stability of polymers during decomposition. In this study, the IPDT was calculated from the TGA curve using the following equations [ 36 , 37 , 38 , 39 ]: IPDT = A*K*(T f − T i ) + T i , A* = (S1 + S2)/(S1 + S2 + S3), K* = (S1 + S2)/S1, where A* is the area ratio of the total experimental curve divided by the total TGA thermogram, K* is the modulus, T i is the initial experimental temperature (35 °C), and T f is the final experimental temperature (800 °C). For the analysis, the TGA plot was divided into three regions represented by S1, S2 and S3, as shown in Figure S5c .…”

Recent Developments in the Flame-Retardant System of Epoxy Resin

“…In recent years, siloxanes have attracted widespread attention as efficient, non-toxic, low smoke emission and environment-friendly flame retardants [138,139]. Siloxanes with low surface could migrate from the polymer to the surface during combustion, and react with the polymer to form a dense and stable oxygen-insulating carbon layer, which not only prevents the combustion decomposition products from escaping, but also inhibits the thermal decomposition of the composites [140,141].…”