Almas Nurlan, Kurbanova Bayan, Zhakiyev Nurkhat, Rakhadilov Baurzhan, Sagdoldina Zhuldyz, Andybayeva Gaukhar, Serik Nurzhan, Alsar Zhanna, Utegulov Zhandos, Insepov Zinetula
Department of Science and Innovation, Astana IT University, Nur-Sultan 010000, Kazakhstan.
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan.
Polymers (Basel). 2022 Jul 29;14(15):3067. doi: 10.3390/polym14153067.
In this study, the mechano-chemical properties of aromatic polymer polyetheretherketone (PEEK) samples, irradiated by high energy electrons at 200 and 400 kGy doses, were investigated by Nanoindentation, Brillouin light scattering spectroscopy and Fourier-transform infrared spectroscopy (FTIR). Irradiating electrons penetrated down to a 5 mm depth inside the polymer, as shown numerically by the monte CArlo SImulation of electroN trajectory in sOlids (CASINO) method. The irradiation of PEEK samples at 200 kGy caused the enhancement of surface roughness by almost threefold. However, an increase in the irradiation dose to 400 kGy led to a decrease in the surface roughness of the sample. Most likely, this was due to the processes of erosion and melting of the sample surface induced by high dosage irradiation. It was found that electron irradiation led to a decrease of the elastic constant , as well as a slight decrease in the sample's hardness, while the Young's elastic modulus decrease was more noticeable. An intrinsic bulk property of PEEK is less radiation resistance than at its surface. The proportionality constant of Young's modulus to indentation hardness for the pristine and irradiated samples were 0.039 and 0.038, respectively. In addition, a quasi-linear relationship between hardness and Young's modulus was observed. The degradation of the polymer's mechanical properties was attributed to electron irradiation-induced processes involving scission of macromolecular chains.
在本研究中，通过纳米压痕、布里渊光散射光谱和傅里叶变换红外光谱（FTIR）对在200和400 kGy剂量下经高能电子辐照的芳香族聚合物聚醚醚酮（PEEK）样品的机械化学性质进行了研究。如通过固体中电子轨迹的蒙特卡罗模拟（CASINO）方法的数值所示，辐照电子可穿透至聚合物内部5 mm的深度。在200 kGy剂量下对PEEK样品进行辐照会使表面粗糙度提高近三倍。然而，将辐照剂量增加到400 kGy会导致样品表面粗糙度降低。这很可能是由于高剂量辐照引起的样品表面侵蚀和熔化过程所致。研究发现，电子辐照导致弹性常数降低，以及样品硬度略有下降，而杨氏弹性模量的下降更为明显。PEEK的一个固有体相性质是其耐辐射性低于其表面。原始样品和辐照样品的杨氏模量与压痕硬度的比例常数分别为0.039和0.038。此外，还观察到硬度与杨氏模量之间存在准线性关系。聚合物机械性能的降解归因于电子辐照引发的涉及大分子链断裂的过程。
