Article history: In this work, a novel phosphorus-rich hybrid organic-inorganic silica coating for improving the Received 1 May 2017 ﬂame retardancy of silk fabric was prepared using naturally occurring phytic acid as phos- Received in revised form 1 August 2017 phorus precursor and catalyst for the hydrolysis of tetraethoxysilane. In addition, three silane Accepted 2 August 2017 coupling agents, namely 3-aminopropyldimethoxymethylsilane, 3-chloropropyltrimethoxysilane and Available online 4 August 2017 3-methacryloxypropyltrimethoxysilane, were added in the hybrid sol as cross-linkers with the aim of developing hydrophobic coatings and improving the washing durability of the treated silk fabric. The Keywords: condensation degree of the hybrid sol was characterized by solid-state Si nuclear magnetic resonance Silk spectroscopy. The ﬂammability and thermal degradation properties of the treated silk fabrics were deter- Phytic acid mined in terms of limiting oxygen index, vertical burning, pyrolysis combustion ﬂow calorimetry and Silica thermogravimetric analyses. The surface morphology and hydrophobicity of the treated silk fabrics were Sol-gel Flame retardancy evaluated by scanning electron microscopy, atomic force microscopy and water contact angle tests. The Hydrophobicity ﬂammability tests revealed that the silicon sol could endow silk fabric with excellent ﬂame retardancy when doped with phytic acid, and the treated silk fabrics self-extinguished
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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