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In this paper, the so-called approximate convexity and concavity properties of generalized Gr?tzsch ring function μα(r) by studying the monotonicity, convexity or concavity of certain composites of μα(r) are obtained.
      
Preparation and properties of polymer and quantum dot composites
      
The prepared composites were characterized with UV-Vis, PL, TEM, FTIR, CLSM and conductance titration etc.
      
Spectra results indicated that there existed interactions between nanocarbon and the polymethyl methacrylate (PMMA) matrix, which was consistent with the decrease in glass transition temperature of the composites with increase of carbon content.
      
TEM images revealed that a carbon encapsulated core/shell structure was formed in the composites, which could ensure good dispersion of carbon nanoparticles within the PMMA matrix.
      
The decomposition of the composites was less influenced by the introduction of nanocarbon particles.
      
Preparation of conductive polypyrrole (PPy) composites under supercritical carbon dioxide conditions
      
Electrically conductive composites were prepared via the chemical oxidative polymerization of the pyrrole monomer in polystyrene (PS) and zinc neutralized sulfonated polystyrene (Zn-SPS) films under supercritical carbon dioxide (SC-CO2) conditions.
      
The percolation thresholds of PS/PPy and Zn-SPS/PPy composites were 6.2% and 2.7% of the volume fraction of PPy, respectively, much lower than the theoretically predicted value of 16%.
      
Moreover, the conductive composites prepared under SC-CO2 conditions showed higher thermal stability, especially in the high-temperature region.
      
The conductivity of PANI/TiO2 composites changes with TiO2 amount and reaches an optimum value of 2.86 S/cm at 11.1 wt% TiO2.
      
Photovoltaic devices from CdSe nanocrystals and conjugated polymer composites
      
Photovoltaic devices were fabricated from the composites of ns-CdSe and poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) or poly(3-hexylthiophene) (P3HT).
      
The poplar wood samples were impregnated with the modifiers and heated to prepare UF-SiO2-wood composites.
      
The antiswelling efficiency, resistance of water absorption, oxygen index and hardness of the composites were measured.
      
The effect of roots (the finest roots) in soil-root composites (undisturbed soils) was analyzed.
      
The impact of two coupling agents, maleic anhydride (coupling agent 1) and isocyanate (coupling agent 2) on the properties of wood-plastic composites (WPC) was studied.
      
Improvement in compatibility and mechanical properties of modified wood fiber/polypropylene composites
      
Mechanical properties of wood-fiber/polypropylene (WF/PP) composites were improved when PP-g-MAH or SEBS-g-MAH was added.
      
When either of these copolymers was added, the composites had better interfacial compatibility than the unmodified composite.
      
 

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