Xiangjie Duan,Jie Zhao,Shuaida Song,Na Zhou,Jizhuang Fan,Bo Tian,Yunchen Du
The development of non-toxic and flexible polymer-based shielding composites has become a research hotspot due to the severe harm of γ ray to living organisms, mechanical equipment, and environment. However, the γ-ray shielding performance of polymer-based composites in high-energy range remains unsatisfactory. Herein, FLUKA Monte Carlo simulations capable of visualizing γ-photon transport behaviors are investigated in Bi 2 O 3 /PP and WO 3 /PP multi-layer composites with various layered configurations. The simulation results reveal significant anisotropic attenuation effects on shielding characteristics caused by layered configurations and incident path of γ-photons relative to the interface position. Subsequently, single-layer, AB, and sandwich-like ABA composites with a fixed thickness of 2.0 mm are experimentally fabricated via melt-mixing and hot press methods. At 1332 keV, sandwich-like WPPBPPWPP composite (WO 3 /PP outer layers + Bi 2 O 3 /PP core) achieves linear attenuation coefficients and radiation protection efficiency of 0.31 cm −1 and 6 %, respectively, which are 29 % higher than those of single-layer composite. These improvements originate from multiple scattering induced by interlayer interface. Additionally, layered configurations with externally placed high-density fillers (WO 3 ) and internally placed high atomic number fillers (Bi 2 O 3 ) further promote γ-photon attenuation in high-energy range. Experimental results validate the anisotropic shielding trends observed in MC simulations. Moreover, multi-layer composites demonstrate significantly improved energy storage capacity, thermal stability, and oxidation resistance while maintaining comparable to those of single-layer composites. This work provides a scalable strategy for developing non-toxic and flexible shielding materials applicable in nuclear protection, medical devices, and aerospace systems, where lightweight and efficient radiation attenuation are critical.
Shuaida Song,Jie Zhao,Xiangjie Duan,Na Zhou,Jizhuang Fan,Bo Tian,Yunchen Du
Polymer-based composites are receiving more and more attention in the field of radiation shielding due to their good recyclability and processability; however, the poor compatibility between the organic polymer matrices and inorganic fillers usually appears as a bottleneck to their full shielding effectiveness. Although compatibilizers are widely utilized to suppress the agglomeration of inorganic fillers, their impact on the overall performance of composites is less concerning.In this study, we systematically investigate the effects of three common compatibilizers, i.e. 3-aminopropyltriethoxysilane (KH550), 3-methacryloxypropyltrimethoxysilane (AM), and maleic anhydride–grafted polypropylene (PP-g-MAH), on the properties of WO3/PP composites, including rheological performance, thermal properties, crystallization behaviors, mechanical properties, and radiation shielding effectiveness.It was found that in addition to dispersing WO3 particles, KH550 and AM contribute to the formation of a heterogeneous network structure in the PP matrix, and especially for KH550, it can effectively promote the structural stability, thermal stability, crystallinity, and toughness of WO3/PP composites. More importantly, WO3/PP-S-K exhibits the best shielding performance, with linear attenuation coefficients of 3.71 cm−1 and 0.279 cm−1 under 241Am (59.6 keV) and 60Co (1332 keV) irradiation, respectively. Compared with the pristine WO3/PP composite, the half-value layer is markedly reduced to 0.187 cm and 2.48 cm, representing decreases of 25.5% and 60.6%.These findings underscore the enhancements in shielding performance and structural integrity achieved through modification with KH550, thereby providing valuable insights for the future development of environmentally friendly radiation shielding materials.
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