In this work, the effect of exposure to 5 kGy of Gamma radiation and the addition of Multi-walled carbon nanotubes (MWCNT) in different concentration 0, 0.2, 0.4 and 0.6 wt% to sisal fiber/unsaturated polyester resin (SF-UP) composites (40/60) on the mechanical and acoustical properties was investigated. An enhancement in the mechanical properties was achieved by addition MWCNT up to 0.4%, and then decreased at 0.6%. Also, irradiation of the composite manifested an enhancement in the mechanical properties more than unirradiated ones. The tensile strength and flexural strength of irradiated SF-UP composite which contains 0.4% MWCNT were higher than unirradiated SF-UP composite which contains 0% MWCNT by 73.2 and 91.9%, respectively. The addition of MWCNT and exposure to 5 kGy of gamma radiation increased both the storage modulus and the Tg while the damping factor (tan δ) decreased. Increasing the MWCNT % enhanced the sound absorption at the higher frequencies (0.6% MWCNT (unirradiated)∼0.9 within 5000–6300 Hz), while the irradiation shifted the highest absorption toward lower frequencies (0.6% MWCNT (irradiated)∼0.63 within 2500–3150 Hz). The produced composite displayed appreciable mechanical and acoustical properties which makes it as a new partner for many advanced industrial applications.

在这项工作中，暴露于 5 kGy 伽马辐射和添加不同浓度 0、0.2、0.4 和 0.6 wt% 的多壁碳纳米管 (MWCNT) 对剑麻纤维/不饱和聚酯树脂 (SF-UP) 的影响研究了复合材料 (40/60) 对机械和声学性能的影响。通过添加 MWCNT 达到 0.4%，然后在 0.6% 时降低，实现了机械性能的提高。此外，复合材料的辐照表现出比未辐照的更大的机械性能增强。含 0.4% MWCNT 的辐照 SF-UP 复合材料的拉伸强度和弯曲强度分别比含 0% MWCNT 的未辐照 SF-UP 复合材料高 73.2% 和 91.9%。添加 MWCNT 和暴露于 5 kGy 的伽马辐射增加了储能模量和 Tg，而阻尼因子 (tan δ) 降低。增加 MWCNT % 增强了较高频率的吸声率（0.6% MWCNT（未辐照）~0.9 在 5000-6300 Hz 内），而辐照将最高吸收移向较低频率（0.6% MWCNT（辐照）~0.63 在 2500- 3150 赫兹）。生产的复合材料显示出可观的机械和声学特性，使其成为许多先进工业应用的新合作伙伴。63 在 2500-3150 赫兹内）。生产的复合材料显示出可观的机械和声学特性，使其成为许多先进工业应用的新合作伙伴。63 在 2500-3150 赫兹内）。生产的复合材料显示出可观的机械和声学特性，使其成为许多先进工业应用的新合作伙伴。