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<p>In the present work, the novel polymer composites including polymethylmethacrylate (PMMA) and natural Bitumen (BTM) were prepared using the solvent casting method. The BTM extracted from rocks enriched with hydrocarbons. The optical and structural properties of composite films were examined by numerous spectroscopic methods, such as ATR-FTIR, XRD, FT-Raman, and UV-vis spectroscopy. Both crystalline and amorphous phases were seen in the XRD patterns in the BTM material. The Raman spectra distinguished two well-known bands. The presence of interaction between BTM was validated by the FTIR data and the host PMMA polymer. The PMMA: BTM composite films’ surface morphology showed the nanoscale with excellent resolution using field-emission scanning electron microscopy (FESEM). The optical properties of the composite films were analyzed at different BTM concentrations to identify the changes induced in the doped PMMA films. Various key optical parameters, including the dielectric constant’s imaginary and real parts (ε<sub>i</sub> and ε<sub>r</sub>), refractive index (<i>n</i>) and absorption coefficient (α) were calculated. The indirect band gap was measured for both pure and doped PMMA films; notably, the optical band gap decreased from 4.88 to 1.26&#xa0;eV. The optoelectronic parameters, including thermal emissivity (ε<sub><i>th</i></sub>), sheet resistance (<i>R</i><sub><i>s</i></sub>), and merit figure (φ<sub>film</sub>), were studied for pure and BTM-doped PMMA films. The relevant parameters for assessing the energy losses (SELF and VELF) were investigated in detail with the help of calculated optical dielectric parameters. The φ parameter is successfully used to distinguish the regions of photons in visible spectra, which is powerful in moving electrons from the valence band (VB) to the conduction band (CB). The achievements show that the laser power beam is effectively dropped to zero by the PMMA: BTM polymer composite films. The outcome of the current study is crucial for various fields including photonics, optoelectronics and lasers in medical application.</p>

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New materials with small optical band gap based on PMMA inserted with bitumen for laser cut-off

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Shanya N. Adbdullah,
  • Shujahadeen B. Aziz

摘要

In the present work, the novel polymer composites including polymethylmethacrylate (PMMA) and natural Bitumen (BTM) were prepared using the solvent casting method. The BTM extracted from rocks enriched with hydrocarbons. The optical and structural properties of composite films were examined by numerous spectroscopic methods, such as ATR-FTIR, XRD, FT-Raman, and UV-vis spectroscopy. Both crystalline and amorphous phases were seen in the XRD patterns in the BTM material. The Raman spectra distinguished two well-known bands. The presence of interaction between BTM was validated by the FTIR data and the host PMMA polymer. The PMMA: BTM composite films’ surface morphology showed the nanoscale with excellent resolution using field-emission scanning electron microscopy (FESEM). The optical properties of the composite films were analyzed at different BTM concentrations to identify the changes induced in the doped PMMA films. Various key optical parameters, including the dielectric constant’s imaginary and real parts (εi and εr), refractive index (n) and absorption coefficient (α) were calculated. The indirect band gap was measured for both pure and doped PMMA films; notably, the optical band gap decreased from 4.88 to 1.26 eV. The optoelectronic parameters, including thermal emissivity (εth), sheet resistance (Rs), and merit figure (φfilm), were studied for pure and BTM-doped PMMA films. The relevant parameters for assessing the energy losses (SELF and VELF) were investigated in detail with the help of calculated optical dielectric parameters. The φ parameter is successfully used to distinguish the regions of photons in visible spectra, which is powerful in moving electrons from the valence band (VB) to the conduction band (CB). The achievements show that the laser power beam is effectively dropped to zero by the PMMA: BTM polymer composite films. The outcome of the current study is crucial for various fields including photonics, optoelectronics and lasers in medical application.