Zaharescu Traian, Bumbac Marius, Nicolescu Cristina Mihaela, Stelescu Maria Daniela, Borbath Tunde, Borbath Istvan
Radiochemistry Center, National Institute for Research and Development in Electrical Engineering ICPE-CA, RO 030138 Bucharest, Romania.
SC Roseal SA, RO 535600 Odorheiu Secuiesc, Romania.
Polymers (Basel). 2025 May 12;17(10):1314. doi: 10.3390/polym17101314.
This study investigates the stability behavior of blends composed of ethylene-propylene-diene monomer (EPDM) and styrene-butadiene-styrene (SBS), focusing on the effects of γ-irradiation on these materials. FTIR, CL, and DSC analysis indicate that blends with more than 50% SBS demonstrate remarkable resistance to significant radiation doses. This study highlights that at increased γ-irradiation doses, specifically 100 and 150 kGy, structural changes in the polystyrene aromatic rings are detected, providing insights into the modifications induced by radiation exposure. Among the tested formulations, the blend containing 75% SBS demonstrated the best performance against γ-irradiation, showcasing superior mechanical and structural resistance to radiation-induced degradation. The results indicate that γ-irradiation leads to managed degradation within the SBS/EPDM mixtures: while EPDM experiences increased crosslinking, SBS proves resilient against crosslinking, thus bolstering the stability of EPDM under irradiation scenarios. Additionally, thermal analysis underlines the beneficial role of SBS by showing enhanced thermal stability in SBS-rich samples (SBS content higher than 50%) experiencing reduced thermal degradation through repeated heating cycles. This outcome suggests that the inclusion of SBS effectively reduces crosslinking and chain scission impacts, thereby enhancing consistency in thermal properties over multiple cycles.
本研究调查了由三元乙丙橡胶（EPDM）和苯乙烯-丁二烯-苯乙烯（SBS）组成的共混物的稳定性行为，重点关注γ辐射对这些材料的影响。傅里叶变换红外光谱（FTIR）、差示扫描量热法（DSC）分析表明，SBS含量超过50%的共混物对显著辐射剂量具有显著抗性。本研究强调，在γ辐射剂量增加时，特别是100和150千戈瑞，聚苯乙烯芳环的结构变化被检测到，这为辐射暴露引起的改性提供了见解。在测试的配方中，含有75%SBS的共混物在抗γ辐射方面表现出最佳性能，对辐射诱导的降解表现出卓越的机械和结构抗性。结果表明，γ辐射导致SBS/EPDM混合物内可控降解：虽然EPDM交联增加，但SBS对交联具有弹性，从而增强了EPDM在辐照情况下的稳定性。此外，热分析通过显示富含SBS的样品（SBS含量高于50%）在反复加热循环下热降解减少，强调了SBS的有益作用。这一结果表明，加入SBS有效地降低了交联和链断裂的影响，从而在多个循环中提高了热性能的一致性。
