Surface Modification of Basic Magnesium Sulfate Whiskers

Abstract

Surface modification was conducted on the basic magnesium sulfate whiskers (MSW) using sodium stearate. The modification performance was evaluated by comparing the activation index, oil absorption value, rest angle, and dispersibility in polypropylene (PP) resin prior to and after treatment. It was found that the surface properties of the whiskers were improved by sodium stearate modification. In particular, the improvement in the dispersibility in PP was significant. Surface characterization was conducted using scanning electron microscopy (SEM), thermogravimetric-differential scanning calorimetry (TG-DSC) and fourier transform infrared spectroscopy (FTIR) for the raw and modified whiskers. The results indicated the co-existence of both chemical and physical adsorptions of sodium stearate on the surfaces of MSW.

Surface modification mechanism of magnesium oxysulfate whiskers via wet chemical method

“…The surface energy, surface polarity and oil absorbency of MOSW decline by the effect of the coordination between Mg, O in MOSW and molecules of modifier. However, the dispersion of MOSW is improved dramatically, although the modification has little effect on the thermal stability [15]. The microstructure model of modified MOSW established in this paper can be a guidance on the surface structure model of MOSW modified by other modifier similar to zinc stearate.…”

“…From the references about surface modification, most researches on this aspect are focused on the metal and alloy material [12][13][14], but complete analyses made in surface modification of MOSW are rare. Han et al [15] conducted a research on the modified MOSW with sodium stearate as modifier. The activation index and oil absorption value of the modified MOSW were 99.12 % and 3.49 mlÁg -1 , respectively.…”

Durable and Nontoxic Natural Rubber-Based Composites with Antibacterial Properties

“…However, few studies have used them in conjunction with NRL. 20 Preparation of the culture medium, bacterial solution, and suspension of the test bacteria is provided in the Supporting Information.…”

“…Crystal whiskers are single-crystal nanofibers with high strength, heat resistance, antibacterial performance, corrosion resistance, wear resistance, and flame retardancy. , It is widely used in plastics, metals, and ceramics. However, few studies have used them in conjunction with NRL. − …”

“…However, few studies have used them in conjunction with NRL. 20 This study selected three types of inorganic whiskers (needle-like calcium carbonate whisker (CaCOw), tetrapodlike zinc oxide whisker (T-ZnOw), needle-like, fusiform, or fan-shaped alkaline magnesium oxysulfate whisker (MOSw)), which are ecofriendly and do not form toxic compounds when reacting with other rubber components, and introduced them into the NRL matrix. Accordingly, we fabricated whiskers/ NRL composites with excellent mechanical properties and antibacterial efficacy.…”