三种市售医用一次性防护服的γ射线辐照后效应

Effect of gamma irradiation on three kinds of disposable medical protective clothing

探讨了聚对苯二甲酸乙二醇酯/聚氨基甲酸酯(PET/PU)、聚丙烯/聚乙烯(PP/PE)、聚乙烯(PE)三种不同材质医用防护服辐照灭菌的辐照后效应及辐照对防护服材料性能的影响。通过扫描电镜、表面接触角、断裂拉伸性能测试和电子自旋共振谱等表征方法,系统研究了医用防护服材料辐照灭菌后表面形貌、亲水性、力学性能和自由基的变化。结果表明:PET/PU、PP/PE、PE材质的防护服经γ射线辐照后,微观形貌没有很明显改变,材料表面疏水性下降,接触角分别降低2.8%、7.9%和17.8%;灭菌剂量(≤50 kGy)下γ射线辐射对PET/PU的拉伸性能影响不大,而PP/PE和PE的拉伸性能随着吸收剂量的增加而不同程度地降低;经辐照灭菌的防护服在贮存一个月后拉伸断裂强力和断裂伸长率变小。PP/PE和PE被辐照后产生的自由基信号强度随着吸收剂量的增加而增强,自由基浓度随贮存时间迅速降低,一个月后趋于稳定。

The post-radiation effect of three kinds of disposable medical protective clothing made of polyethylene terephthalate/polyurethane(PET/PU),polypropylene/polyethylene(PP/PE),and polyethylene(PE)after radiation sterilization and the effects of radiation on the properties of protective clothing were investigated.The changes in surface morphology,hydrophilicity,mechanical properties,and free radicals of medical protective clothing materials after radiation sterilization were systematically studied using scanning electron microscopy(SEM)and electron spin resonance(ESR)spectroscopy,and by examining the surface contact angle and tensile properties at break.The results showed that the surface morphology of protective clothing made of PET/PU,PP/PE,and PE undergoes no obvious change afterγ-ray irradiation.However,the hydrophobicity of the surfaces-whose contact angles were reduced by 2.8%,7.9%,and 17.8%,respectively-decreased.γ-ray irradiation has little effect on the tensile properties of PET/PU at the sterilizing dose(≤50 kGy).On the other hand,the tensile breaking strength and elongation at break of PP/PE and PE protective clothing decreased with the increasing absorbed doses.The signal intensity of free radicals produced by PP/PE and PE protective clothing increased with the absorbed dose and the concentration of free radicals decreased rapidly with the storage time and tended to stabilize after one month.