Abstract
Eugenol, used as bio-phenol, was designed to replace the hydrogen atom of hydrogenterminated siloxane by hydrosilylation reaction under the presence of alumina-supported platinum catalyst (Pt-Al2O3), silica-supported platinum catalyst (Pt-SiO2) and carbon nanotube-supported platinum catalyst (Pt-CNT), respectively. The catalytic activities of these three platinum catalysts were measured by nuclear magnetic resonance hydrogen spectrometer (1H NMR). The properties of bio-phenol siloxane were characterized by Fourier transform infrared spectrometer (FT–IR), UV-visible spectrophotometer (UV) and thermogravimeter (TGA), and its antibacterial property against Escherichia coli was also studied. The results showed that the catalytic activity of the catalyst Pt-CNT was preferable. When the catalyst concentration was 100 ppm, the reaction temperature was 80 °C and reaction time was 6 h, the reactant conversion rate reached 97%. After modification with bio-phenol, the thermal stability of the obtained bio-phenol siloxane was improved. For bio-phenol siloxane, when the ratio of weight loss reached 98%, the pyrolysis temperature was raised to 663 °C which was 60 °C higher than hydrogenterminated siloxane. Meanwhile, its autonomic antibacterial property against Escherichia coli was improved significantly.
Highlights
A bio-phenol is a phenol that derives from natural products, for example, vegetablse, tea-leaves, and flowers
Combined with the analysis shown that the catalytic activity of catalyst Pt-CNT was preferable compared with catalyst Pt-Al2 O3 above, it was shown that the catalytic activity of catalyst Pt-CNT was preferable compared with and catalyst Pt-SiO2 in this hydrosilylation reaction between eugenol and hydrogenterminated siloxane
Compared with catalyst Pt-Al2 O3 and catalyst Pt-SiO2, we found the catalytic activity of catalyst
Summary
A bio-phenol is a phenol that derives from natural products, for example, vegetablse, tea-leaves, and flowers. Eugenol (4-allyl-2-methoxyphenol) is one kind of bio-phenol, which is a primary constituent of plant essential oil such as clove oil, laurel oil and camphor oil and characterized by the presence of functional groups such as hydroxy group, methoxy group and allyl group. Because of this unique structure, eugenol has biological and chemical characteristics, for example, antibacterial activity, antioxidant activity thermal stability and chemical reactivity [1,2,3,4]. The product, bio-phenol siloxane, was characterized by Fourier transform infrared spectrometer (FT–IR), ultravioler–visible (UV) spectrophotometer and thermogravimeter, and its antibacterial activity against Escherichia coli was studied
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