| Radiation shielding materials can be used to reduce the hazards of radiation and keep the securityof public, which have important research value. Basing on the research status and actual needs ofradiation shielding materials at present, this thesis mainly studied functional nanoparticles modifiedepoxy composites. Radiation shielding functional particles were selected and optimized by simulationand calculation. Influences of particle size, proportion and distribution of functional nanoparticles onthe radiation shielding properties of composites were mainly investigated. The related mechanism wasalso discussed in general. Main results were as follows:(1) The WinXCom software was used to simulate and calculate the radiation shieldingproperties of CeO2、Sm2O3、Er2O3、Gd2O3、WO3、Bi2O3. The property of K edge absorption wasmainly investigated. Based on the results of simulation and calculation, functional particles wereselected and optimized, which provided basis for the preparation of radiation shielding materials.(2) Nano CeO2/epoxy, micro CeO2/epoxy, nano Er2O3/epoxy, micro Er2O3/epoxy compositeswere successfully prepared. Their structures, mechanical properties and radiation shielding propertieswere tested. Results revealed that: functional nanoparticles were well dispersed in epoxy; themechanical property of nano particles/epoxy was better than that of mico particles/epoxy; radiationshielding properties of nano CeO2/epoxy and nano Er2O3/epoxy were better than that of microCeO2/epoxy and micro Er2O3/epoxy respectively, which were more obvious when the energy ofradiation was low.(3) Different kinds of Bi2O3, Er2O3and CeO2nanoparticles/epoxy composites were successfullyprepared. Influences of element proportion on radiation shielding properties of composites werestudied. Results revealed that the composite with more Bi2O3nanoparticles exhibited better radiationshielding property when the energy of radiation was high. The composite with more Er2O3nanoparticles exhibited better radiation shielding property when the energy of radiation was low.Nano CeO2/Er2O3/Bi2O3/epoxy composites exhibited balanced radiation shielding properties.(4) Multilayer nano Er2O3/epoxy and nano Er2O3/Bi2O3/epoxy with different structures andparticle distributions were prepared. Results revealed that radiation shielding properties of nanoEr2O3/epoxy composites with different structures and particle distributions did not exhibit obviousdifferences with each other. Radiation shielding properties of nano Er2O3/Bi2O3/epoxy compositeswith different structures and particle distributions exhibited obvious differences with each other. |
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