Poly (methyl methacrylate) (PMMA) is known as one of the common transparent polymer materials. In this work, pure poly (methyl methacrylate), methyl methacrylate-acrylonitrile copolymer, methyl methacrylate-styrene copolymer was synthesized by bulk polymerization based on the mechanism of free radical polymerization to observe the polarity change of the PMMA after introducing styrene and acrylonitrile monomers. Meanwhile the glass transition temperature, hardness, contact angle and color distribution of the copolymer were measured through polymer temperature deformation analysis experiment, hardness and contact angle measuring instrument.
In this study, polylactic acid(PLA)/ketoconazole(KCZ) composite microspheres were prepared by oil/water solvent evaporation method. Those drug-loaded microspheres were characterized in morphology using the scanning electron microscope (SEM). Fourier transform infrared spectroscopy (FT-IR) was used to determine the chemical functional groups in the sample and to analysis whether a chemical reaction occured between PLA and KCZ. The thermogravimetric spectra of PLA and PLA/KCZ microspheres were used to analyse the influence of KCZ on the thermal decomposition mechanism of PLA. Crystallinities of the KCZ and PLA/KCZ were analyzed by X-ray diffraction analysis (XRD).
Water-soluble CdTe quantum dots(QDs) with mercaptoacetic molecules as ligands, were obtained by the reduction of CdCl2 through NaHTe under alkaline conditions. The sub-micron fluorescent spheres were synthesized by silica coated CdTe cadmium QDs, through the ammount control of tetraethyl orthosilicate (TEOS), ammonia, QDs suspension, ethanol and the ratio of them. The fluorescent property of as-prepared QDs was researched using fluorescent spectrometer, and some influencing factors in the process of preparation were discussed. Morphology and coated effect of silica composite spheres were observed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the fluorescence intensity was analyzed using fluorescence microscope.
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