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

Rui Huang,Qiuhong Mu,Dan Peng,Hui Zhao,Zhizhou Yang,Jinshui Yao

doi:10.3390/polym12102284

Rui Huang, Qiuhong Mu + Show 4 more

Open Access

https://doi.org/10.3390/polym12102284

Copy DOI

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.

Highlights

Silicone resin is a highly crosslinked polysiloxane with a three-dimensional network, which is usually prepared by hydrolytic polycondensation of polyfunctional organosilanes [1,2,3]
All silicone resins showed a broad peak near 1000 −1 cm−1 belonging to Si–O–Si bond, which indicates silicone resins showed a broad peak near 1000 cm belonging to Si–O–Si bond, which indicates the the formation of Si–O–Si main chain in the silicone resins
The formation of Si–OH groups in the silicone resins could be confirmed by the characteristic groups

Summary

Introduction

Silicone resin is a highly crosslinked polysiloxane with a three-dimensional network, which is usually prepared by hydrolytic polycondensation of polyfunctional organosilanes [1,2,3]. They have many excellent properties, such as thermal stability, oxidation resistance, etc [4,5]. Silicone resins have many applications, such as thermal protection materials, engine sealant, high temperature-resistant adhesives, and light-emitting diode chips, etc [6,7,8]. The search for materials with high thermal stability is a goal of this research

Methods

Results

Conclusion