In this research work, nanocomposites were synthesized by addition of fractions (0.0, 0.02, 0.04 and 0.06) of multi-wall carbon nanotubes (MWCNTs) to epoxy resin to investigate the optical properties and glass transition temperature. Optical measurement shows that epoxy matrix films have high absorption at the different MWCNTs fractions (0.0, 0.02, 0.04 and 0.06). The optical energy gaps for allowed direct transition were evaluated and found to decrease with increasing film fractions, precisely, from 2.85 to 1.32 eV when fractions increased from 0.0 to 0.06 of the matrix weights that indicated strong shifts at 435–935 nm with increasing fraction. The values of the absorption coefficient and extinction coefficient increased with fractions of MWCNTs while the refractive index and the real part of dielectric constant decreased with the fractions of MWCNTs. Also, the glass transition temperature was investigated and was found to increase with increasing fraction of carbon nanotube in the matrix.

中文翻译：

---

纳米环氧树脂基体的光学性能和玻璃化转变温度研究

在这项研究工作中，通过将多壁碳纳米管 (MWCNT) 的分数 (0.0、0.02、0.04 和 0.06) 添加到环氧树脂中来合成纳米复合材料，以研究其光学性能和玻璃化转变温度。光学测量表明，环氧基质薄膜在不同的 MWCNTs 分数（0.0、0.02、0.04 和 0.06）下具有高吸收。评估了允许直接跃迁的光能隙，发现随着薄膜分数的增加，当分数从基质重量的 0.0 增加到 0.06 时，精确地从 2.85 到 1.32 eV，表明随着分数的增加，在 435-935 nm 处发生了强烈的位移。吸收系数和消光系数值随着多壁碳纳米管的分数增加而增加，而折射率和介电常数的实部随着多壁碳纳米管的分数而减小。此外，还研究了玻璃化转变温度，发现它随着基质中碳纳米管比例的增加而增加。