Measurements of THz absorption peaks in photo-degraded polyethylene and their assignment by quantum chemical calculations
Measurements of THz absorption peaks in photo-degraded polyethylene and their assignment by quantum chemical calculations
复制标题
DOI：
10.1109/ceidp.2013.6747437
复制
发表时间：
2013-12
期刊：
影响因子：
--
通讯作者：
M. Hosobuchi;M. Komatsu;X. Xie;Y. Cheng;Y. Furukawa;Y. Ohki;M. Mizuno;K. Fukunaga
中科院分区：
文献类型：
--
作者：
M. Hosobuchi;M. Komatsu;X. Xie;Y. Cheng;Y. Furukawa;Y. Ohki;M. Mizuno;K. Fukunaga
低密度聚乙烯（LDPE）的电绝缘性能仍不清楚，特别是当它被降解时。在这方面，在室温和85℃下将紫外（UV）光子照射到LDPE片材上，并在0.5至3.0THz和18至105THz的频率下测量它们的吸收光谱。紫外线照射下会出现非常宽的吸收带，其峰值在 1.6 THz 左右。根据该表现，由羰基结构引起的红外吸收峰增加。使用具有和不具有羰基的 3 维模型进行量子化学计算。结果发现，具有羰基的模型在约 1.7 THz 处具有光学活性模式。从这些结果来看，1.6 THz 处吸收的增加被认为是由氧化引起的。
Electrical insulation properties of low density polyethylene (LDPE) are still unclear, especially when it is degraded. In this regard, ultraviolet (UV) photons were irradiated to LDPE sheets at room temperature and 85 °C and their absorption spectra were measured at frequencies from 0.5 to 3.0 THz and from 18 to 105 THz. A very broad absorption band with its peak at around 1.6 THz appears by the UV irradiation. In accord with this appearance, the infrared absorption peak due to a carbonyl structure increases. Quantum chemical calculations were carried out using 3-dimensional models with and without carbonyl groups. As a result, the model with carbonyl groups was found to have optically active modes at about 1.7 THz. From these results, the increase in absorption at 1.6 THz is assumed to be induced by oxidation.