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Song N.,Shanghai University | Zhang X.,Shanghai University | Shi L.,Shanghai University | Shi L.,Dongguan SHU Institute of Nanotechnology DSINT | And 3 more authors.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2013

The grinding of ultra-fine talcum powder and its application in a polypropylene (PP) matrix were investigated. Ultra-fine talcum powder was prepared by adjusting the grinding parameters of the physical milling process. The talcum powder exhibited polymodal distribution. The layered morphology of talcum particles in a horizontal sand mill was rarely damaged or destroyed. PP-talcum nanocomposites were prepared by melt blending using a twin-screw extruder. Nano talcum can be seen as a single particle, although it is not very apparent. The bending strength of talcum-filled PP was gradually increased by approximately 28%. The impact strength linearly decreased as the filler weight ratio increased. The overall maximum improvement in mechanical properties was recorded when the filler ratios increased from 15 wt% to 20 wt%. © 2013 Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.

Ding P.,Shanghai University | Ding P.,Dongguan SHU Institute of Nanotechnology DSINT | Li Z.,Shanghai University | Tang S.,Shanghai University | And 4 more authors.
Microchimica Acta | Year: 2013

Molecularly imprinted films with self-supporting property (SS-MIFs) have been prepared by using the strategy of transition layer construction followed by reversible addition-fragmentation chain transfer (RAFT) polymerization. The structure, composition and selectivity of the SS-MIFs as well as the mechanism of mass transfer were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform IR spectrometry, specific surface area analysis, thermogravimetric analysis, and HPLC. Surface area analysis showed the samples possessed specific surface areas as high as 80.5 m2.g-1. This is almost 9 times more than that of the original porous anodic aluminum oxide substrate. Thermogravimetric analysis also showed the samples to be thermally stable up to 350 °C. The separating power was investigated by HPLC and revealed a selective separation effect for the target molecules theobromine. The separation factor is 5.37. © 2013 Springer-Verlag Wien.

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