Raman scattering from polymerizing styrene. I. Vibrational mode analysis

Abstract

Correlation effects on Raman scattering from lowenergy vibrational modes in fractal and disordered systems. I. TheoryThe frequencies and intensities of the Raman spectrum of thermally polymerizing styrene were measured in order to confirm (or correct) the mode assignments in the literature and to observe the effect of polymerization on the Raman active modes. The spectra were measured over a period of three weeks while an originally highly purified sample of monostryrene was kept at about 100 'C. The polymer vibrations are identified with their monomer "origins" which are in turn compared to known benzene (or benzene derivatives) and ethylene (or vinyl group) vibrations.

Electrospun Polystyrene-Multiwalled Carbon Nanotubes: Imaging, Thermal and Spectroscopic Characterization

“…Figure 4 presents the FT-IR spectra for PS film (as a reference), electrospun PS fibers and electrospun PS-MWCNTs fibers. PS film frequencies were assigned based on reported literature data at 3057 cm −1 and 3024 cm −1 for aromatic C-H stretch, 2916 cm −1 for tertiary C-H stretch, 2850 cm −1 for CH 2 symmetric stretch, 1600 cm −1 and 1490 cm −1 C-C ring stretch, 1451 cm −1 CH 2 bending, 1182 cm −1 , 1155 cm −1 and 1027 cm −1 in-plane CH deformation, 754 cm −1 out-of-plane C-H bending and 698 cm −1 C-C-C out-of-plane ring deformation [22,23]. However, it was difficult to observe and identify these vibrations in the electrospun PS fibers due to the low intensity of the peaks in the spectrum.…”

Multi‐instrument characterization of poly(divinylbenzene) microspheres for use in liquid chromatography: as received, air oxidized, carbonized, and acid treated

“…[54] Figure 7b and c shows the Raman spectra for carbonized (at 900°C) and acid-treated, carbonized PDVB. While these spectra are radically different from the spectrum for the untreated PDVB, they are nearly identical to each other, suggesting that the carbonized PDVB only changes in a superficial way when it is acid treated.…”

Scanning Angle Raman spectroscopy in polymer thin film characterization

“…A transition located at 1028 cm -1 was assigned to a C-H in-plane bending mode of PS. 47 The 889 cm -1 shift transition of PC has been previously assigned to both an O-C(O)-O stretch and a C-CH3 stretch. Additional Raman transitions observed at 1108 and 1180 cm -1 were associated with PC.…”

“…[44][45][46][47] TIR Raman spectroscopy has a fixed excitation wavelength and possess a constant penetration depth of evanescent wave. Raman scattering occurs when a molecule is in vibrational excited state n, after being promoted to virtual excited state, returns to ground state m after the scattering.…”

“…The dominant Raman transitions of PS and PC were observed at 1001 and 889 cm -1 , respectively. The Raman spectra of PS [46][47][48] and PC 49,50 have been previously reported. The 1001 cm -1 shift transition of PS has been assigned to the aromatic ring breathing mode.…”