Surface modification of polyamide66 fabric by grafting with vinyltrimethoxysilane

Abstract

Melt-dripping is always a big chanllenge in flame retardant finishing of synthetic fabrics. In this work, vinyltrimethoxysilane(VTMS) was introduced onto the polyamide66(PA66) surface by microwave grafting to improve the fire performance. The chemical structure of the grafted fabric was characterized by attenuated total reflection Fourier transformation infrared spectroscopy(ATR-FTIR) and X-ray photoelectron spectroscopy(XPS). The thermal stability analysis and flammability evaluation of the grafted samples by thermogravimetric analysis(TGA), cone calorimetry, vertical burning tests and limiting oxygen index(LOI) demonstrate that the presence of grafting chains significantly reduces the dripping tendency and decreases the heat release rate of polyamide66(PA66) fabric. The surface morphology observed by scanning electron microscope(SEM) indicates that VTMS can not only promote the formation of protective layers, which prevent the substrate from further thermal degradation, but also promote the char formation of PA66 substrate during combustion.

Keywords

Polyamide66 fabric / Microwave grafting / Char formation / Hydrophobicity / Dripping tendency

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