A novel method for preparing nanoparticle‐coated additives used in polypropylene composites

Abstract

A novel simultaneous, in situ milling and coating method carried out in a fluid energy mill (FEM) is applied for the first time to prepare nanoparticle‐coated CaCO3 (CC) additives for polymer composite materials. Simply milled (without coating) CC particles and as‐received CC particles were used as references for comparison. The effects of the grinding pressure and the fraction of the nanoparticles on the size and flowability of CC particles were studied. The composites made with polypropylene (PP) and this specially prepared CC have higher elongation at break, elastic modulus, and impact strength, compared with the PP filled with uncoated CC. The thermal and thermo‐oxidative stabilities of PP are improved as well by introducing the milled and nanoparticle‐coated CC. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers

Attrition of Ca‐based CO2‐adsorbents by a high velocity gas jet

“…Using these techniques, the nanoparticle agglomerates are disrupted down to a submicrometer scale, and the powder particles are coated during collisions, yielding a uniform nanoparticle coating of the host particles . Besides decreasing cohesiveness, nanoparticle coating can be useful to increase the mechanical strength of the composite material . In our study, we have chosen the simplest process to mix the Ca(OH) 2 powder with the silica nanopowder, just consisting of dry physical mixing by hand.…”