In this study, the structural, X-ray and gamma-ray, and neutron shielding properties of shape memory ternary blend/multi-walled carbon nanotube (MWCNT) composite films were investigated. The composition of the composite films was defined as (100-x) poly (ε-caprolactone) (PCL):polyethylene glycol (PEG):polyvinyl chloride (PVC) + xMWCNT, where x = 0, 1, 3, 5% (mole percentage). The ternary blend/MWCNT composite films were characterized using Attenuated Total Reflectance Infrared Spectroscopy (ATR-IR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). Thermal results showed that the degradation temperatures of composite materials with two degradation curves increased with increasing MWCNT percentage. The appearance of the MWCNT signal along with the characteristic polymer signals in the XRD pattern may be evidence that MWCNT is homogeneously distributed in the polymer blend. The mass attenuation coefficients (MAC), half-value layer (HVL), mean free path (MFP), and effective atomic numbers (Z_eff) of the composite films were experimentally measured over an energy range of 8.04–383.85 keV. Additionally, the equivalent dose rates for fast neutrons were measured, and the exposure buildup factor (EBF) and fast neutron removal cross-section (Σ_R) were theoretically calculated. The proton and alpha shielding parameters of the ternary blend/MWCNT composite films were determined, revealing that the inclusion of higher amounts of MWCNTs in the composite structure significantly improved capability of the films in shielding against radiation and neutrons.

中文翻译：

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多壁碳纳米管/形状记忆三元共混复合薄膜的表征及辐射屏蔽效率

在这项研究中，研究了形状记忆三元共混物/多壁碳纳米管（MWCNT）复合薄膜的结构、X射线和伽马射线以及中子屏蔽性能。复合膜的组成定义为（100-x）聚（ε-己内酯）（PCL）：聚乙二醇（PEG）：聚氯乙烯（PVC）+ xMWCNT，其中x = 0, 1, 3, 5%（摩尔百分比）。使用衰减全反射红外光谱 (ATR-IR)、热重分析 (TGA)、差示扫描量热法 (DSC)、X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 对三元共混物/MWCNT 复合薄膜进行了表征。热结果表明，具有两条降解曲线的复合材料的降解温度随​​着MWCNT百分比的增加而增加。多壁碳纳米管信号的出现以及 XRD 图案中的特征聚合物信号可能证明多壁碳纳米管均匀分布在聚合物共混物中。在 8.04–383.85 keV 的能量范围内实验测量了复合薄膜的质量衰减系数 (MAC)、半值层 (HVL)、平均自由程 (MFP) 和有效原子序数 (Z_eff)。此外，还测量了快中子的等效剂量率，并从理论上计算了暴露累积因子（EBF）和快中子去除截面（Σ_R）。测定了三元共混物/MWCNT复合薄膜的质子和α屏蔽参数，表明复合结构中包含较高量的MWCNT显着提高了薄膜屏蔽辐射和中子的能力。