Preparation and properties of water‐soluble polyester surfactants. II. Preparation and surface activity of silicone‐modified polyester surfactants

Lai

2012

J Surfact & Detergents

In this study we prepared and characterized a series of novel ester‐linked gemini surfactants, featuring ester bonds in their structures, through the reactions of polyethylene glycol (PEG400) with various fatty acids (C8–C18). These gemini surfactants exhibit excellent surface activities, as evidenced by their surface tension, wetting power, and low‐foaming and buffer abilities. We examine the influence of the concentrations of the ester‐linked gemini surfactants on the surface tension, from which we obtain the critical micelle concentrations. Under basic conditions, each of these cleavable surfactants decomposes into a water‐insoluble fatty acid and two water‐soluble products; in contrast, they are stable under neutral and acidic conditions.

Section: Cleavabilitysupporting

confidence: 61%

Surface Activity and Cleavability of Gemini Surfactants Featuring Hydrophilic Spacer Groups

Lai

2012

J Surfact & Detergents

“…The silicone polyesters were prepared by the reaction of a hydroxyl‐terminated polyester (PEG, molecular weight = 2000–10,000) and an organopolysiloxane. The preparation and purification of these products were described previously 14,15. The following chemicals were used as supplied: magnesium chloride, molecular formula: MgCl 2 (reagent grade obtained from Hayashi Pure Chemical Co., Osaka, Japan), titanium dioxide (Anatase), molecular formula: TiO 2 (supplied by Chyuan‐Yaw, Taipei, Taiwan), methylene blue, molecular formula: C 16 H 18 ClN 3 S (reagent grade obtained from Hayashi Pure Chemical Co., Osaka, Japan).…”

Section: Methodsmentioning

confidence: 99%

Photocatalytic properties of silicone polyesters using calcium phosphate/titanium dioxide

Chu

J of Applied Polymer Sci

Liu

et al. 2009

Self Cite

This study uses titanium dioxide treated with calcium phosphate to prepare multilayer structure composites. These products are regarded as photocatalysts. Utilizing polyethylene glycol (PEG)-silicone polyester as an adhesive spread on matrix surfaces, this can provide these products with antifouling properties, good weather resistance, and antibacterial property. It has been observed that UV irradiation has caused changes in the film molecular structure of PEG-silicone polyesters, as well as changes in the surface morphology. These changes in molecular structure have been observed by FTIR and Raman analysis. PEG-silicone polyesters contain silicon atoms with both organic and inorganic characteristics. This makes fixation of photocatalysts possible and retards oxidation of organic materials in the polyesters. The results of FTIR and Raman spectrum analyses indicate films made of these polyesters effectively cover calcium phosphate-titanium dioxide photocatalysts, retard surface cracks, and slow down decomposition, caused by UV light.

“…A series of water‐soluble polymeric surfactants were prepared by the reaction of organopolysiloxane with hydroxyl‐terminated polyester, as described previously 14, 15. The structure of the silicone surfactants can be represented as shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

A new modified silicone–TiO₂ polymer composite film and its photocatalytic degradation

J of Applied Polymer Sci

Lee

2006

Self Cite

The photodegradation of the silicone surfactant-TiO 2 composite films was characterized by FTIR, Raman spectroscopy, and scanning electron microscope. After photocatalytic degradation, the FTIR SiÀ ÀOÀ ÀSi peak intensity of the composite film remained unchanged, implying no cleavage of SiÀ ÀOÀ ÀSi bond. The above SiÀ ÀOÀ ÀSi peak intensity is sensitive to the polyoxyethylene chain length of the composite. The PEG10000-silicone composite is more resistant to photodegradation than those composites with lower molecular weight of constituent PEGs. The wetting rates of the silicone surfactant-TiO 2 composites showed that modified silicone composite films exhibited hydrophobic nature.