Li-Huei Lin

Synthesis and surface activity of polyethylene glycol–maleic anhydride–polydimethylsiloxane polyester surfactants

Abstract A novel series of water-soluble polyethylene glycol (PEG)–silicone polyester surfactants has been prepared by the polymerization of PEG, maleic anhydride, polydimethylsiloxane and fumaric acid. The unique structural features of these surfactants have been confirmed by FTIR, proton nuclear magnetic resonance and elemental analysis. Also, the influences of the PEG segment lengths of PEG–silicone polyesters on the surface tension, wetting power and dispersant properties were investigated. The experimental results indicated that the solution that contained the PEG–silicone polyester surfactants exhibits excellent surface active properties.

Preparation and Drug Release of Aspirin-Loaded PLGA-PEG-PLGA/Montmorillonite Microparticles

A polymerization method was used to synthesize biodegradable poly(lactide-co-glycolide)/poly(ethyleneglycol)/poly(lactide-co-glycolide) (PLGA-PEG-PLGA) copolymers. These copolymers were then used to prepare microparticles for encapsulating drug (aspirin). The results of X-ray diffraction (XRD) analysis showed that the montmorillonite (MMT) can be converted into organic montmorillonite (o-MMT). Subsequently, the emulsion solvent evaporation method was used to separately prepare aspirin-loaded PLGA-PEG-PLGA and aspirin-loaded PLGA-PEG-PLGA/o-MMT microparticles. The results of scanning electron microscopy (SEM) showed that microparticle formation was related to the polyvinyl alcohol (PVA) concentration and the proportion of o-MMT. In addition, the ultraviolet-visible (UV-Vis) spectroscopy was conducted to determine the release rate of these microparticles. GRAPHICAL ABSTRACT

Surface Modification of Poly(lactic acid) Fabrics with Plasma Pretreatment and Chitosan/Siloxane Polyesters Coating for Color Strength Improvement

As people in the 21st century become increasingly environmentally aware, environmentally friendly products have come into focus. As such, environmentally friendly textiles and eco-textiles have become an international trend in research and development. Poly(lactic acid) fiber, which is biodegradable, holds much promise, but it is difficult to deep dye. This study used chitosan, succine anhydride, siloxane, and polyethylene glycol to produce a series of chitosan/siloxane polyesters that have a hydrophilic component (chitosan) and a hydrophobic component (siloxane), and this chitosan/siloxane polyester can be coated on poly(lactic acid) fiber, which we had subjected to Argon plasma treatment to increase their antimicrobial properties and to increase the fibers dyeing efficiency. The study shows that, after the surface plasma treatment, longer PEG chain lengths resulted in higher K/S values. This result suggests that the surface plasma pretreatment and chitosan/siloxane polyesters coating showed that lower ∆E values result in more leveling dyeing of poly(lactic acid) fiber.

Utilization of dried activated sludge for the removal of basic dye from aqueous solution

AbstractTextile dye wastewater can easily lead to environmental pollution issues because of its toxicity and difficult treatment. If the waste sludge produced from sewage treatment plant is used as an adsorbent to treat textile dye wastewater, waste recycling can be achieved. This study investigated the use of dried activated sludge (DAS) for the removal of Basic Red 29 dye from aqueous solution and used granular-activated carbon to compare differences in adsorption capacity. Influence on adsorption capacity of various factors, such as adsorbent properties, initial dye concentration and dye solution temperature, were investigated on the original dye solution. Kinetic data followed well both pseudo-first-order model and pseudo-second-order model. Equilibrium data fitted well with the Langmuir isotherm model. The monolayer adsorption capacity was found as 224.72 mg g−1 at 30°C. Thermodynamic studies indicated that adsorption process was exothermic in nature and the adsorption heat was −17.70 kJ mol−1. The F...

Surface properties and morphologies of pheohydrane/ liquid crystal moisturizer product

In this study, we investigated the properties of three different liquid crystal‐type humectants prepared through a simple emulsion process. Under a polarized microscope, we observed liquid crystal textures for each of the three moisturizers. When we applied them onto the hands and face, we found that they all provided effective hydration, with pheohydrane/liquid crystal moisturizer exhibiting superior performance. We also investigated the surface properties (contact angle, zeta potential, surface tension, transmission electron microscopy and scanning electron microscopy analyses) after adding pheohydrane to Formula product.

Polyethylene Glycol/Polydimethylsiloxane Polyester Products as Leveling Agents in Nylon Dyeing

A novel series of water-soluble PEG-silicone polyesters surfactants is prepared by polymerization of polyethylene glycol (PEG), maleic anhydride (MA), polydimethylsilox ane, and fumaric acid (FA). The unique structural features of these surfactants are confirmed by FTIR, 1H-NMR, and elemental analysis. The presence of these surfactants retards the rate of nylon dyeing with acid dyes, which, along with the low-foaming property of these novel PEG-silicone polyesters, makes it possible for these surfactants to be used as leveling agents for modem nylon dyeing with acid dyes.

Preparation and dispersion properties of water-soluble polyethylene glycol-dimethyl 5-sulfoisophthalate sodium salt polyester surfactants

Abstract The reaction of polyethylene glycol (PEG, number-average molecular weights Mn=400–2000) and dimethyl 5-sulfoisophthalate sodium salt (SIPM) produced a series of water-soluble polymeric surfactants. The structure of these surfactants was confirmed by IR, 1H-NMR and elemental analysis. These polymeric surfactants have been found to exhibit excellent pH buffer capacity and dispersant properties in disperse dye system. The experimental results indicated that these surfactants could retard the rate of polyester dyeing with disperse dyes and may be used as leveling agents.

Hydrophobicities and antibacterial activities of silicone polyester/titanium dioxide composites on nylon fabrics after argon plasma treatment

In this study, we blended silicone, polyethylene glycols, and TiO2 to obtain TiO2 composites that we then coated onto nylon fabric, which we had subjected to Ar plasma treatment. Fourier transform infrared and Raman spectroscopic characterization revealed that our PEG-silicone–TiO2 composites were more resistant to plasma treatment than were the TiO2-free systems. We used scanning electron microscopy and high-resolution X-ray photoelectron spectroscopy to observe the surface morphologies and surface element compositions and dispersions of these composites on the nylon fabric before and after plasma treatment. Contact angle tests revealed the variations in wetting induced by the different hydrophilic PEG-silicone–TiO2 composites. The use of higher-molecular-weight PEG-silicone–TiO2 resulted in the largest contact angle (>120°), providing products with better water-repellency. In addition, we investigated the antibacterial properties of nylon fabric toward Staphylococcus aureus; after Ar plasma surface treatment, the hydrophobic surface of the fabric retained its antibacterial activity.

Avobenzone encapsulated in modified dextrin for improved UV protection and reduced skin penetration

The present study used differential scanning calorimetry, thermogravimetric analysis, and UV spectrometry to examine: i) the encapsulation of an organic UV filter 1-(4-methoxyphenyl)-3-(4- tert-butylphenyl)propane-1,3-dione (avobenzone) within modified dextrin and ii) the characteristics of these inclusion complexes (MDA). The properties of avobenzone emulsions with and without encapsulation in modified dextrin, the in vitro UV protection factor, dissolution and release, and the skin penetrability of avobenzone were also examined. The presence of inclusion complexes significantly decreased the tendency of the UV filter to penetrate the skin. In addition, such inclusion complexes should effectively prevent skin damage from radiation extending from the UVA to the UVC.

Physicochemical Properties of Amino Acid Surfactants and Their Use in Dyeing with Natural Plant Dyes

Abstract Environment-friendly green amino acid surfactants were prepared by the reaction of glutamic acid with various fatty acids (C2–C14). These green amino acid surfactants have been found to exhibit good surface activities i.e. surface tension, foaming, wetting power and emulsifying ability. The critical micelle concentration (CMC) increases with an increase of the alkyl chain of amino acid surfactants. After 5 days the biodegradation of these amino acid surfactants was larger than 60% and consequently, the surfactants should be regarded as readily biodegradable. Finally, the green amino acid surfactants were added to natural plant dyes to test their applicability for dyeing wool fibers. The surfactant developed in this study will contribute to green and sustainability chemistry.