In this article, dynamic packing injection molding (DPIM) technology was used to prepare injection samples of Polypropylene-Calcium Carbonate (PP/CaCO 3 ) nanocomposites. Through DPIM, the mechanical properties of PP/nano-CaCO 3 samples were improved significantly. Compared with conventional injection molding (CIM), the enhancement of the tensile strength and impact strength of the samples molded by DPIM was 39 and 144%, respectively. In addition, the tensile strength and impact strength of the PP/nano-CaCO 3 composites molded by DPIM increase by 21 and 514%, respectively compared with those of pure PP through CIM. According to the SEM, WAXD, DSC measurement, it could be found that a much better dispersion of nano-CaCO 3 in samples was achieved by DPIM. Moreover, ccrystal is found in the shear layer of the DPIM samples. The crystallinity of PP matrix in DPIM sample increases by 22.76% compared with that of conventional sample. The improvement of mechanical properties of PP/nano-CaCO 3 composites prepared by DPIM attributes to the even distribution of nanoCaCO 3 particles and the morphology change of PP matrix under the influence of dynamic shear stress.
A telescoped process has been developed for practical preparation of N,O-chelated four-coordinate diarylborinates via direct reaction of N,O-chelate ligands with a diarylborinate solution prepared by removal of magnesium via precipitation from a one-pot reaction of aryl bromides, magnesium, and tributylborate. Ten N,O-chelated diarylborinates of representative N,O-chelate ligands of 2-picolinic acid, quinolin-8-ol, N-dimethylglycine, and amino alcohols were readily obtained in good yields. The telescoped process not only minimizes chemical waste and circumvents tedious purification of diarylborinic acids but also eliminates handling of Grignard reagents and improves compatibility with acid-sensitive groups.
With the proliferation of wet milling and magnetic separation, a huge amount of steel slag mud has been discharged, waiting to be recycled. To recycle steel slag mud on a largescale, a possible solution is to prepare steel slag and other industrial solid wastes into mine filling materials. In this paper, the steel slag mud is activated through mechanochemical activation, and the mechanical activation laws are explored through X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR). The results show that mechanochemical activation can partially excite the activity of steel slag mud, and that the fineness of steel slag mud is positively correlated with the mechanical performance of the filling material. In addition, the low field nuclear magnetic resonance (NMR) was adopted to analyze how the fineness of steel slag mud affects the porosity distribution of the filling material, and disclose the relationship between fineness and the material strength. The analysis shows that the mine filling materials prepared from steel slag mud, slag and flue gas desulfurization gypsum (FGDG) fully satisfy the required working performance. The research findings lay a theoretical basis for recycling steel slag mud, solves the environmental pollution of this type of industrial solid waste and reduces the filling cost of mine enterprises.
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