This work investigated the effects of a radiation-protective filler, namely bismuth oxide (Bi₂O₃), and blowing agents, namely azodicarbonamide (ADC) and oxy-bis (benzene sulfonyl) hydrazide (OBSH), on gamma attenuation and the mechanical, physical, and morphological properties of cellular natural rubber (NR) composites for potential use as light-weight and lead-free gamma-shielding materials. The contents of Bi₂O₃ were varied from 100 to 300 and 500 parts per hundred of rubber by weight (phr) and the contents of ADC or OBSH were varied from 0 to 8 and 16 phr. The results indicated that the addition of Bi₂O₃ enhanced the overall gamma-shielding ability, density, tensile modulus, and hardness (Shore OO), but lowered the tensile strength and elongation at break. On the other hand, the addition of ADC or OBSH resulted in decreases in the density, linear attenuation coefficient (μ), and overall tensile properties but an increase in the mass attenuation coefficient (μ_m), with ADC producing better mechanical properties than samples with OBSH. In addition, investigations on the properties of the cellular Bi₂O₃/NR composites under additional 35 kGy and 70 kGy gamma irradiation revealed that the irradiated samples had increased density, tensile modulus, and hardness (Shore OO), but decreased tensile strength, elongation at break, and μ_m after such ageing. In conclusion, the overall results suggested that the developed cellular Bi₂O₃/NR composites not only had efficient and promising gamma-shielding and mechanical properties but also offered comfort and light-weight to users, which could potentially reduce discomforts caused by wearing heavier conventional radiation-protective equipment.

这项工作研究了辐射防护填料，即氧化铋（Bi ₂ O ₃）和发泡剂，即偶氮二甲酰胺（ADC）和氧-双（苯磺酰基）酰肼（OBSH），对伽马衰减和机械性能的影响。多孔天然橡胶（NR）复合材料的物理，形态和形态特性，可潜在地用作轻质和无铅的伽玛屏蔽材料。Bi ₂ O ₃的含量为每100重量份橡胶100至300和500份（phr），ADC或OBSH的含量为0至8和16phr。结果表明，Bi ₂ O _3的添加增强了整体的伽玛屏蔽能力，密度，拉伸模量和硬度（邵尔OO），但降低了拉伸强度和断裂伸长率。在另一方面，添加ADC或OBSH的导致了密度线性衰减系数（降低，μ）和总拉伸性能，但增加了质量衰减系数（μ_米），与ADC产生更好的机械性能比样品与OBSH。另外，对细胞Bi ₂ O ₃的性质的研究/下额外35千戈瑞和70千戈瑞γ辐射NR复合显示，该辐照样品增加了密度，拉伸弹性模量，和硬度（肖氏OO），但降低的抗张强度，断裂伸长率，和μ_米这样老化后。总之，总体结果表明，开发的蜂窝状Bi ₂ O ₃ / NR复合材料不仅具有有效的和有前途的伽玛屏蔽和机械性能，而且还为用户提供了舒适感和轻巧性，这有可能减少因穿着较重而引起的不适感常规的辐射防护设备。