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High-temperature structural evolution and hydrolytic stability of poly(phenylborosiloxane)

Gang Wang (College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, China and Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin, China and Institute of Advanced Technology, Heilongjiang Academy of Sciences, Harbin, China)
Xiaohui Liu (Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin, China and Institute of Advanced Technology, Heilongjiang Academy of Sciences, Harbin, China)
Changhong Mi (Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin, China and Institute of Advanced Technology, Heilongjiang Academy of Sciences, Harbin, China)
Huijuan Fan (Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin, China and Institute of Advanced Technology, Heilongjiang Academy of Sciences, Harbin, China)
Bo Xu (Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin, China and Institute of Advanced Technology, Heilongjiang Academy of Sciences, Harbin, China)
Xuefeng Bai (College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, China and Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin, China and Institute of Advanced Technology, Heilongjiang Academy of Sciences, Harbin, China)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 8 August 2018

Issue publication date: 22 August 2018

221

Abstract

Purpose

The purpose of this study was to investigate the microstructural evolution and hydrolytic stability of poly(phenylborosiloxane) (PPhBS) to further use and develop the oligomers as heat-resistant modifiers.

Design/methodology/approach

PPhBS was synthesized by direct co-condensation of boric acid (BA) and phenyltriethoxysilane (PTEOS). The structural evolution of PPhBS at high temperature was investigated by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA), in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and 29Si nuclear magnetic resonance (NMR) spectroscopy. In addition, the change in the morphology of the PPhBS powder was examined to demonstrate the evolution of the chemical bonds, and the hydrolytic stability of PPhBS was investigated by a combination of X-ray diffraction (XRD) analysis, measurement of the mass loss in water and FTIR spectroscopy.

Findings

The results revealed that a cross-linking network was gradually formed with increasing temperature through the condensation of the residual hydroxyl groups in PPhBS, and the Si-OH and B-OH bonds remained even at a high temperature of 450°C. Furthermore, heat treatment improved the hydrolytic stability of the oligomer. The hydrolysis of the B-O-B bonds in PPhBS was reversible, whereas the Si-O-Si and Si-O-B bonds were highly resistant to hydrolysis.

Practical implications

The prepared PPhBS can be used as a heat-resistant modifier in adhesives, sealants, coatings and composite matrices.

Originality/value

Investigation of the structural evolution of a polyborosiloxane at high temperature by DRIFTS is a novel approach that avoided interference from moisture in the air. The insoluble mass fraction and the FTIR spectrum of PPhBS washed with water were used to investigate the hydrolytic stability of PPhBS.

Keywords

Citation

Wang, G., Liu, X., Mi, C., Fan, H., Xu, B. and Bai, X. (2018), "High-temperature structural evolution and hydrolytic stability of poly(phenylborosiloxane)", Pigment & Resin Technology, Vol. 47 No. 4, pp. 308-314. https://doi.org/10.1108/PRT-10-2017-0082

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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