Study on the Synthesis and Thermal Stability of Silicone Resin Containing Trifluorovinyl Ether Groups

Abstract

Silicone resin is a high-temperature resistant material with excellent performance. The improvement of its thermal stability has always been the pursuit of researchers. In this paper, a sequence of silicone resins containing trifluorovinyl ether groups were prepared by the co-hydrolysis-polycondensation of methyl alkoxysilane monomers and {4-[trifluorovinyl(oxygen)]phenyl}methyldiethoxysilane. The structures of the silicone resins were characterized by FT-IR and 1H NMR. The curing process of them was studied by DSC and FT-IR spectra, and results showed that the curing of the resins included the condensation of the Si-OH groups and the [2 + 2] cyclodimerization reaction of the TFVE groups, which converted to perfluorocyclobutane structure after curing. The thermal stability and thermal degradation behavior of them was studied by TGA and FT-IR spectra. Compared with the pure methyl silicone resin, silicone resins containing TFVE groups showed better thermal stability under both N2 and air atmosphere. Their hydrophobic properties were characterized by contact angle test. Results showed that PFCB structure also improved the hydrophobicity of the silicone resin.

The Effect of Physiological Incubation on the Properties of Elastic Magnetic Composites for Soft Biomedical Sensors

“…The results of DSC tests for the clear PDMS polymer and PDMS-MPs composites before and after incubation in a 0.9 wt.% saline solution for 12 weeks are presented in Figure 3. Analysis of the obtained DSC spectra allowed the determination of exothermic peaks observed in the range 140-170 • C for the second heating experiment, probably corresponding to the cyclization reactions of the PDMS [49,50], which were observed mainly for samples before incubation and endothermic peaks around 150-160 • C for materials after 12 weeks of incubation. The typical exothermic peak gives important information for describing the curing phenomenon.…”

Synthesis of Pyridine Heterocyclic Low-Melting-Point Phthalonitrile Monomer and the Effects of Different Curing Agents on Resin Properties

“…Common high-performance polymers include polyimide, polybenzoxazine, polyether ether ketone (PEEK), phthalonitrile (PN), etc. [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. The requirements for high temperature resistance, corrosion resistance, and high flame retardancy of materials are increasing.…”

Synthesis and Properties of Phthalonitrile Polymer with a Novel Piperazine Structural Curing Agent

“…Polymer materials, as an integral part of the 21st century, play an important role in all walks of life, and are widely used in all spheres of society, such as transportation, communication and construction, etc. Common high‐performance polymers include polyether ether ketone, [1] polybenzoxazine, [2] polyimide, [3] polyaryl ether nitrile, [4] silicone resin [5] and PN [6] resin, etc. As a high‐temperature thermosetting polymer, PN resin has received extensive attention due to its high thermal and thermo‐oxidative stabilities, excellent thermomechanical properties and high glass transition temperature [7] .…”