Manaila Elena, Craciun Gabriela, Lungu Ion Bogdan, Dumitru Grivei Marius Daniel, Stelescu Maria Daniela
Electron Accelerators Laboratory, National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor St., 077125 Magurele, Romania.
Multipurpose Irradiation Facility Center-IRASM, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, 30 Reactorului St., 077125 Magurele, Romania.
Materials (Basel). 2023 Mar 7;16(6):2152. doi: 10.3390/ma16062152.
Composites based on natural rubber and plasticized starch obtained by the conventional method of sulfur cross-linking using four types of vulcanization accelerators (Diphenyl guanidine, 2-Mercaptobenzothiazole, N-Cyclohexyl-2-benzothiazole sulfenamide, and Tetramethylthiuram disulfide) were irradiated with an electron beam in the dose range of 150 and 450 kGy for the purpose of degradation. The vulcanization accelerators were used in different percentages and combinations, resulting in four mixtures with different potential during the cross-linking process (synergistic, activator, or additive). The resulting composites were investigated before and after irradiation in order to establish a connection between the type of accelerator mixture, irradiation dose, and composite properties (gel fraction, cross-linking degree, water absorption, mass loss in water and toluene, mechanical properties, and structural and morphological properties). The results showed that the mixtures became sensitive at the irradiation dose of 300 kGy and at the irradiation dose of 450 kGy, and the consequences of the degradation processes were discussed.
基于天然橡胶和增塑淀粉的复合材料通过传统的硫磺交联方法制备，使用了四种硫化促进剂（二苯基胍、2-巯基苯并噻唑、N-环己基-2-苯并噻唑次磺酰胺和四甲基秋兰姆二硫化物），为了降解目的，用电子束在150至450 kGy的剂量范围内进行辐照。硫化促进剂以不同的百分比和组合使用，在交联过程中产生了四种具有不同潜力的混合物（协同、活化或加和）。对所得复合材料在辐照前后进行了研究，以建立促进剂混合物类型、辐照剂量与复合材料性能（凝胶分数、交联度、吸水性、在水和甲苯中的质量损失、机械性能以及结构和形态性能）之间的联系。结果表明，混合物在300 kGy和450 kGy的辐照剂量下变得敏感，并对降解过程的后果进行了讨论。
