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Stimulated Raman Scattering During Pulsed Laser-Induced Co-polymerization of n-Butyl Methacrylate and n-Octadecyl Methacrylate

  • Asma Batool
  • Asghari Gul
  • Saira Arif
  • Mohammad Aslam KhanEmail author
Research Article - SCI-Physics
  • 7 Downloads

Abstract

We report simultaneous photoinitiated polymerization and stimulated Raman scattering (SRS) from polymers of methacrylate monomers using a Q-switched Nd: YAG laser (second harmonic radiation at 532 nm). The monomers used were n-butyl methacrylate and n-octadecyl methacrylate together with benzoyl peroxide as initiator, dissolved in ethanol. During the interaction of focused laser pulses with the mixtures of monomers, a strong signal in the forward direction at 630.4 nm was recorded that corresponds to SRS signal originating from Raman active vibrational stretching modes of \({\varvec{\nu }}{{\varvec{s}}}\)(C–H) of \(-\hbox {OCH}_{3}\) with \({\varvec{\nu }}{{\varvec{s}}}\)(C–H) of \(\alpha \hbox {-CH}_{3}\) and \({\varvec{\nu }}{{\varvec{a}}}(\hbox {CH}_{2})\) groups at \(2957\,\hbox {cm}^{-1}\) in the polymethacrylate. In addition, another SRS signal at 773.2 nm corresponding to the first overtone of the referred Raman mode was also recorded. Results are presented where different compositional mixtures of the polymerizing monomers, and different laser energies were used mainly for the strongest SRS intensities that could possibly be an index of the rate and extent of polymerization.

Keywords

Stimulated Raman scattering Laser–matter interaction Photochemistry Laser-induced polymerization Butyl methacrylate and octadecyl methacrylate Real-time monitoring of polymerization 

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Notes

Acknowledgements

This work was partly supported by Higher Education Commission (Pakistan) under Project #: 2154/NRPU/R and D/HEC/12. The Chemistry Department, Quaid-i-Azam University (Islamabad, Pakistan) is acknowledged for their support through provision of chemicals and help with sample analysis.

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • Asma Batool
    • 1
  • Asghari Gul
    • 1
    • 2
  • Saira Arif
    • 1
    • 2
  • Mohammad Aslam Khan
    • 1
    Email author
  1. 1.Department of PhysicsCOMSATS UniversityIslamabadPakistan
  2. 2.Department of ChemistryCOMSATS UniversityIslamabadPakistan

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